OleDbConnection strcon = new OleDbConnection();
public void Open_DataAccess()
{
string s = "Provider=Microsoft.Jet.OLEDB.4.0;Data Source=" + Application.StartupPath + "SX.mdb";
      strcon.ConnectionString = s;
      strcon.Open();
}

Sử dụng Dataset để load dữ liệu lên form như sau:

public DataSet Load_Data()

{
      DataSet dsHienThi = new DataSet();
      string s = "select mahomh,maloaimh,mamh,tenmh from DL_MatHang";
      Open_DataAccess();
      OleDbDataAdapter daShowData = new OleDbDataAdapter(s, strcon);
      daShowData.Fill(dsHienThi, "DL_MatHang");
      Close_Connect();
      return dsHienThi;

}

Load dữ liệu lên DataGirdView

DataSet ds=new DataSet();
ds = Load_Data();
dataGridView1.DataSource = ds.Tables [0];

[VB.NET] Viết ứng dụng chạy có tham số Arguments Params

C:/MyApplication.exe thamso1 thamso2 thamso3 thamso..n

FULL SOURCE CODE.

 Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim args As String() = Environment.GetCommandLineArgs()
        'PictureBox1.Image = New Bitmap("img7.jpg")
        If args.Length > 1 Then
            PictureBox1.Image = New Bitmap(args(1))
            Label2.Text = args(1)

        End If
    End Sub

[VB.NET] Lập trình đăng tin tự động lên Wordpress sử dụng XML-RPC

Giao diện demo của ứng dụng auto post tin lên blog Wordpress:

Bước 1: Các bạn tạo các control và cài đặt thuộc tính cho nó như sau
Textbox 1 : Name : txtTitle
Textbox 2 : Name : txtpost, Multiline : True
Button : Name: btnPost

  Imports CookComputing.XmlRpc
 
Public Structure blogInfo
      Public title As String
      Public description As String
End Structure
 
Public Interface IgetCatList
       _
      Function NewPage(ByVal blogId As Integer, ByVal strUserName As String, ByVal strPassword As String, ByVal content As blogInfo, ByVal publish As Integer) As String
End Interface

Dim newBlogPost As blogInfo = Nothing
newBlogPost.title = txtTitle.Text
newBlogPost.description = txtPost.Text
categories = CType(XmlRpcProxyGen.Create(GetType(IgetCatList)), IgetCatList)
clientProtocol = CType(categories, XmlRpcClientProtocol)
clientProtocol.Url = "http://127.0.0.1/wpl/xmlrpc.php"
Dim result As String = Nothing
result = ""
Try
      result = categories.NewPage(1, "shoban", "shoban", newBlogPost, 1)
      MessageBox.Show("Posted to Blog successfullly! Post ID : " & result)
      txtPost.Text = ""
      txtTitle.Text = ""
Catch ex As Exception
      MessageBox.Show(ex.Message)
End Try
+ Sử dụng code  bằng ngôn ngữ C#

using CookComputing.XmlRpc;
 
public struct blogInfo
{
    public string title;
    public string description;
}
 
public interface IgetCatList
{
    [CookComputing.XmlRpc.XmlRpcMethod("metaWeblog.newPost")]
    string NewPage(int blogId, string strUserName,
        string strPassword, blogInfo content, int publish);
}

blogInfo newBlogPost = default(blogInfo);
newBlogPost.title = txtTitle.Text;
newBlogPost.description = txtPost.Text;
categories = (IgetCatList)XmlRpcProxyGen.Create(typeof(IgetCatList));
clientProtocol = (XmlRpcClientProtocol)categories;
clientProtocol.Url = "http://127.0.0.1/wpl/xmlrpc.php";
string result = null;
result = "";
try
{
    result = categories.NewPage(1, "shoban", "shoban", newBlogPost, 1); MessageBox.Show("Posted to Blog successfullly! Post ID : " + result);
    txtPost.Text = "";
    txtTitle.Text = "";
}
catch (Exception ex)
{
    MessageBox.Show(ex.Message);
}
  

[C#] Download File with progressbar in Shell Console App

NuGet\Install-Package ShellProgressBar -Version 5.2.0

Giao diện demo ứng dụng download file with progressbar Shell console c#:

Source code c#:

using ShellProgressBar;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace progressBarConsole
{
    internal class Program
    {
        static async Task Main(string[] args)
        {
            await StartAsync();
        }
        protected static Task StartAsync()
        {
            var files = new string[]
            {
                "https://github.com/Mpdreamz/shellprogressbar/archive/4.1.0.zip",
                "https://github.com/Mpdreamz/shellprogressbar/archive/4.0.0.zip",
                "https://download.microsoft.com/download/8/a/8/8a8073d2-2e00-472b-9a18-88361d105915/SSMS-Setup-ENU.exe",
                "https://r1---sn-8qj-nbo6y.gvt1.com/edgedl/android/studio/install/2021.3.1.17/android-studio-2021.3.1.17-windows.exe?mh=P9&pl=21&shardbypass=sd&redirect_counter=1&rm=sn-i3b6d7l&req_id=e4e35ad8c06bf917&cms_redirect=yes&cmsv=e&ipbypass=yes&mip=113.161.94.127&mm=28&mn=sn-8qj-nbo6y&ms=nvh&mt=1669251971&mv=u&mvi=1",
               
            };
            var childOptions = new ProgressBarOptions
            {
                ForegroundColor = ConsoleColor.Cyan,
               // ProgressCharacter = '\u2593',
                EnableTaskBarProgress= true,
                ShowEstimatedDuration= true,
                DisplayTimeInRealTime= true,
                
            };
            var pbar = new ProgressBar(files.Length, "downloading");
            foreach (var (file, i) in files.Select((f, i) => (f, i)))
            {
                byte[] data = null;
                 var child = pbar.Spawn(100, "URL: " + file, childOptions);
                try
                {
                    var client = new WebClient();
                    client.DownloadProgressChanged += (o, args) => child.Tick(args.ProgressPercentage);
                    client.DownloadDataCompleted += (o, args) => data = args.Result;
                    client.DownloadDataAsync(new Uri(file));
                    while (client.IsBusy)
                    {
                        Thread.Sleep(1);
                    }

                    pbar.Tick();
                }
                catch (WebException error)
                {
                    pbar.WriteLine(error.Message);
                }
            }

            return Task.CompletedTask;
        }
    }
}

DOWNLOAD SOURCE CODE

[C#] Hướng dẫn thêm cookie vào Http Request website

Vậy Cookie là gì?

Key: psortfilter và Value: 1%24all%24%2BAhRasUDZiQ64tRxy5UrOQ%3D%3D

Source code Cookie Http Request C#:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace bds
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        public Task MakeAsyncRequest(string url)
        {
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            request.ContentType = "application/x-www-form-urlencoded";
            request.UserAgent = "Mozilla/5.0 (Windows; U; Windows NT 6.0; en-US; rv:1.9.0.5) Gecko/2008120122 Firefox/3.0.5";
            Cookie cookie = new Cookie("psortfilter", txt_cookie.Text);
            request.CookieContainer = new CookieContainer();
            Uri uri = new Uri(url);
            request.CookieContainer.Add(uri, cookie);

            request.Method = WebRequestMethods.Http.Get;
            request.Timeout = 20000;
            request.Proxy = null;

            Task task = Task.Factory.FromAsync(
                request.BeginGetResponse,
                asyncResult => request.EndGetResponse(asyncResult),
                (object)null);

            return task.ContinueWith(t => ReadStreamFromResponse(t.Result));
        }

        private static string ReadStreamFromResponse(WebResponse response)
        {
            using (Stream responseStream = response.GetResponseStream())
            using (StreamReader sr = new StreamReader(responseStream))
            {
                string strContent = sr.ReadToEnd();
                return strContent;
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            string http = "https://batdongsan.com.vn/ban-can-ho-chung-cu-tp-hcm";
            string data = MakeAsyncRequest(http).Result;
            richTextBox1.Text = data;
            webBrowser1.DocumentText = data;
        }


    }
}

[C#] Hướng dẫn bảo mật ứng dụng 2FA (Multi-factor Authentication) trên Winform

 
Nhìn chung chương trình Microsoft Authenticate được phát triển như một dạng mã xác thực thứ hai, để người dùng phòng tránh việc bị tấn công tài khoản như ở các ngân hàng, luôn gửi mã xác thực về điện thoại hay ứng dụng để người dùng được biết có nên gửi tiền hay không.

 
Và hiện tại bên ngành của mình cũng đang thực hiện theo chương trình này để đăng nhập vào những ứng dụng riêng của ngành và phòng tránh virus lây lan vào mạng của ngành.

 

Dưới dây là hình ảnh demo của ứng dụng.

Đầu tiên, các bạn cài ứng dụng Microsoft Authenticate vào điện thoại của các bạn.

 
Tiếp đến các bạn scan mã qrcode trên.

Nó sẽ hiển thị cho các bạn mã OTP gồm 6 số để các bạn thực hiện đăng nhập 2FA.

Nó sẽ hiện thị số như hình ở trên.

FULL SOURCE CODE:

using OtpNet;
using QRCoder;
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Net.Sockets;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Windows.Media.Imaging;

namespace OTP_Microsoft_Auth
{
    public partial class Form1 : Form
    {
        readonly QRCodeGenerator qrGenerator = new QRCodeGenerator();
        const int DEFAULT_STEP = 30;
        public Form1()
        {
            InitializeComponent();
            txtAppName.Focus();
            txtAppName.Text = "Demo2FA Auth";
            txtIssuer.Text = "Thảo meo - Laptrinhvb.net";
            txtSecret.Text = Base32Encoding.ToString(KeyGeneration.GenerateRandomKey(20));
        }

        private void Form1_Load(object sender, EventArgs e)
        {

        }

        private void txtSecret_TextChanged(object sender, EventArgs e)
        {
            if (txtAppName.Text != "" && txtIssuer.Text != "" && txtSecret.Text != "")
            {
                var qrCodeUri = $"otpauth://totp/{Uri.EscapeDataString(txtAppName.Text)}?secret={txtSecret.Text}&issuer={Uri.EscapeDataString(txtIssuer.Text)}";

                using (var qrCodeData = qrGenerator.CreateQrCode(qrCodeUri, QRCodeGenerator.ECCLevel.Q))
                {
                    using (var qrCode = new QRCode(qrCodeData))
                    {
                        var qrCodeImage = qrCode.GetGraphic(20);

                        using (var memory = new MemoryStream())
                        {
                            qrCodeImage.Save(memory, ImageFormat.Bmp);
                            memory.Position = 0;
                            var bitmapImage = new Bitmap(memory);
                            pictureBox1.Image = bitmapImage;
                        }
                    }

                }

            }
        }

        private void txtVerify_Click(object sender, EventArgs e)
        {
            var totp = new Totp(Base32Encoding.ToBytes(txtSecret.Text));

            var isValidTotpCode = totp.VerifyTotp(txtCodeOTP.Text, out long timeStepMatched, new VerificationWindow(previous: 1, future: 1));

            var now = DateTime.UtcNow;
            var step = Math.Floor((now - new DateTime(1970, 1, 1)).TotalSeconds / DEFAULT_STEP);

            lblCode1.Text = $"{totp.ComputeTotp(now.AddSeconds(-DEFAULT_STEP))}{Environment.NewLine}({step - 1})";
            lblCode2.Text = $"{totp.ComputeTotp(now)}{Environment.NewLine}({step})";
            lblCode3.Text = $"{totp.ComputeTotp(now.AddSeconds(DEFAULT_STEP))}{Environment.NewLine}({step + 1})";


            if (isValidTotpCode)
            {
               
                MessageBox.Show($"Valid TOTP Code (step: {timeStepMatched})!");
            }
            else
            {
                MessageBox.Show("Invalid TOTP Code");
            }
        }

    
    }
}

Chúc mọi người thành công và bảo mật tốt chương trình của mình nhé.

DOWNLOAD SOURCE CODE

PASSWORD UNZIP: HUNG.PRO.VN

Theo LapTrinhVB.Net

[VB.NET] LẤY ĐỊA CHỈ MÁY TÍNH CỦA BẠN

Bên dưới là hình ảnh ứng dụng.

FULL CODE GET IP ADDRESS.

Imports System.IO
Imports System.Text
Imports System.Net
Imports System.Windows.Forms.VisualStyles.VisualStyleElement
Public Class Form1
    Private Sub Form1_Load(sender As Object, e As EventArgs) Handles MyBase.Load
        Dim address As String = "https://ipinfo.io/ip"
        Dim client As WebClient = New WebClient()
        Dim reader As StreamReader = New StreamReader(client.OpenRead(address))
        TextBox1.Text = reader.ReadToEnd
    End Sub

    Private Sub Button1_Click(sender As Object, e As EventArgs) Handles Button1.Click
        Clipboard.SetText(TextBox1.Text)
        Button1.Enabled = False
        Button1.Text = "DONE"
    End Sub

    Private Sub LinkLabel1_LinkClicked(sender As Object, e As LinkLabelLinkClickedEventArgs) Handles LinkLabel1.LinkClicked
        Process.Start("https://hung.pro.vn")
    End Sub
End Class

DOWNLOAD SOURCE CODE

Đoan code MainActivity.java

package com.sakurafish.exam.location.api;

import android.Manifest;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.content.Intent;
import android.content.IntentSender;
import android.content.pm.PackageManager;
import android.databinding.DataBindingUtil;
import android.location.Location;
import android.os.Build;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.support.v4.app.ActivityCompat;
import android.support.v4.content.ContextCompat;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.View;
import android.widget.Toast;

import com.google.android.gms.common.ConnectionResult;
import com.google.android.gms.common.GoogleApiAvailability;
import com.google.android.gms.common.api.GoogleApiClient;
import com.google.android.gms.common.api.PendingResult;
import com.google.android.gms.common.api.ResultCallback;
import com.google.android.gms.common.api.Status;
import com.google.android.gms.location.LocationListener;
import com.google.android.gms.location.LocationRequest;
import com.google.android.gms.location.LocationServices;
import com.google.android.gms.location.LocationSettingsRequest;
import com.google.android.gms.location.LocationSettingsResult;
import com.google.android.gms.location.LocationSettingsStatusCodes;
import com.sakurafish.exam.location.api.databinding.ActivityMainBinding;

import java.text.DateFormat;
import java.util.Date;

/**
 * Retrieve current location using Google Play Services Location API
 * Based on "https://github.com/googlesamples/android-play-location/tree/master/LocationUpdates"
 */
public class MainActivity extends AppCompatActivity implements GoogleApiClient.ConnectionCallbacks,
        GoogleApiClient.OnConnectionFailedListener,
        LocationListener {

    protected static final String TAG = "location-updates-sample";
    /**
     * 10秒間隔で位置情報を更新。実際には多少頻度が多くなるかもしれない。
     */
    public static final long UPDATE_INTERVAL_IN_MILLISECONDS = 10000;

    /**
     * 最速の更新間隔。この値より頻繁に更新されることはない。
     */
    public static final long FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS =
            UPDATE_INTERVAL_IN_MILLISECONDS / 2;


    private final static String REQUESTING_LOCATION_UPDATES_KEY = "requesting-location-updates-key";
    private final static String LOCATION_KEY = "location-key";
    private final static String LAST_UPDATED_TIME_STRING_KEY = "last-updated-time-string-key";

    private static final int PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION = 1;
    private static final int REQUEST_CHECK_SETTINGS = 10;

    private ActivityMainBinding mBinding;
    private GoogleApiClient mGoogleApiClient;
    private LocationRequest mLocationRequest;
    private Location mCurrentLocation;
    private Boolean mRequestingLocationUpdates;
    private String mLastUpdateTime;
    private String mLatitudeLabel;
    private String mLongitudeLabel;
    private String mLastUpdateTimeLabel;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);

        mBinding = DataBindingUtil.setContentView(this, R.layout.activity_main);
        mLongitudeLabel = getResources().getString(R.string.longitude_label);
        mLastUpdateTimeLabel = getResources().getString(R.string.last_update_time_label);
        mRequestingLocationUpdates = false;
        mLastUpdateTime = "";

        updateValuesFromBundle(savedInstanceState);
        buildGoogleApiClient();
    }

    private void updateValuesFromBundle(Bundle savedInstanceState) {
        Log.i(TAG, "Updating values from bundle");
        if (savedInstanceState != null) {
            if (savedInstanceState.keySet().contains(REQUESTING_LOCATION_UPDATES_KEY)) {
                mRequestingLocationUpdates = savedInstanceState.getBoolean(
                        REQUESTING_LOCATION_UPDATES_KEY);
                setButtonsEnabledState();
            }

            if (savedInstanceState.keySet().contains(LOCATION_KEY)) {
                mCurrentLocation = savedInstanceState.getParcelable(LOCATION_KEY);
            }
            if (savedInstanceState.keySet().contains(LAST_UPDATED_TIME_STRING_KEY)) {
                mLastUpdateTime = savedInstanceState.getString(LAST_UPDATED_TIME_STRING_KEY);
            }
            updateUI();
        }
    }

    protected synchronized void buildGoogleApiClient() {
        Log.i(TAG, "Building GoogleApiClient");
        mGoogleApiClient = new GoogleApiClient.Builder(this)
                .addConnectionCallbacks(this)
                .addOnConnectionFailedListener(this)
                .addApi(LocationServices.API)
                .build();
        createLocationRequest();
    }

    protected void createLocationRequest() {
        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(UPDATE_INTERVAL_IN_MILLISECONDS);
        mLocationRequest.setFastestInterval(FASTEST_UPDATE_INTERVAL_IN_MILLISECONDS);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_HIGH_ACCURACY);
    }

    public void startUpdatesButtonHandler(View view) {
        clearUI();
        if (!isPlayServicesAvailable(this)) return;
        if (!mRequestingLocationUpdates) {
            mRequestingLocationUpdates = true;
        } else {
            return;
        }

        if (Build.VERSION.SDK_INT < 23) {
            setButtonsEnabledState();
            startLocationUpdates();
            return;
        }
        if (ContextCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
            setButtonsEnabledState();
            startLocationUpdates();
        } else {
            if (ActivityCompat.shouldShowRequestPermissionRationale(this, android.Manifest.permission.ACCESS_FINE_LOCATION)) {
                showRationaleDialog();
            } else {
                ActivityCompat.requestPermissions(this, new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
            }
        }
    }

    public void stopUpdatesButtonHandler(View view) {
        if (mRequestingLocationUpdates) {
            mRequestingLocationUpdates = false;
            setButtonsEnabledState();
            stopLocationUpdates();
        }
    }

    private void startLocationUpdates() {
        Log.i(TAG, "startLocationUpdates");

        LocationSettingsRequest.Builder builder = new LocationSettingsRequest.Builder()
                .addLocationRequest(mLocationRequest);
        // 現在位置の取得の前に位置情報の設定が有効になっているか確認する
        PendingResult result =
                LocationServices.SettingsApi.checkLocationSettings(mGoogleApiClient, builder.build());
        result.setResultCallback(new ResultCallback() {
            @Override
            public void onResult(@NonNull LocationSettingsResult locationSettingsResult) {
                final Status status = locationSettingsResult.getStatus();

                switch (status.getStatusCode()) {
                    case LocationSettingsStatusCodes.SUCCESS:
                        // 設定が有効になっているので現在位置を取得する
                        if (ContextCompat.checkSelfPermission(MainActivity.this, Manifest.permission.ACCESS_FINE_LOCATION) == PackageManager.PERMISSION_GRANTED) {
                            LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, MainActivity.this);
                        }
                        break;
                    case LocationSettingsStatusCodes.RESOLUTION_REQUIRED:
                        // 設定が有効になっていないのでダイアログを表示する
                        try {
                            status.startResolutionForResult(MainActivity.this, REQUEST_CHECK_SETTINGS);
                        } catch (IntentSender.SendIntentException e) {
                            // Ignore the error.
                        }
                        break;
                    case LocationSettingsStatusCodes.SETTINGS_CHANGE_UNAVAILABLE:
                        // Location settings are not satisfied. However, we have no way
                        // to fix the settings so we won't show the dialog.
                        break;
                }
            }
        });
    }

    private void setButtonsEnabledState() {
        if (mRequestingLocationUpdates) {
            mBinding.startUpdatesButton.setEnabled(false);
            mBinding.stopUpdatesButton.setEnabled(true);
        } else {
            mBinding.startUpdatesButton.setEnabled(true);
            mBinding.stopUpdatesButton.setEnabled(false);
        }
    }

    private void clearUI() {
        mBinding.latitudeText.setText("");
        mBinding.longitudeText.setText("");
        mBinding.lastUpdateTimeText.setText("");
    }

    private void updateUI() {
        if (mCurrentLocation == null) return;

        mBinding.latitudeText.setText(String.format("%s: %f", mLatitudeLabel,
                mCurrentLocation.getLatitude()));
        mBinding.longitudeText.setText(String.format("%s: %f", mLongitudeLabel,
                mCurrentLocation.getLongitude()));
        mBinding.lastUpdateTimeText.setText(String.format("%s: %s", mLastUpdateTimeLabel,
                mLastUpdateTime));
    }

    protected void stopLocationUpdates() {
        Log.i(TAG, "stopLocationUpdates");
        // The final argument to {@code requestLocationUpdates()} is a LocationListener
        // (http://developer.android.com/reference/com/google/android/gms/location/LocationListener.html).
        LocationServices.FusedLocationApi.removeLocationUpdates(mGoogleApiClient, this);
    }

    @Override
    public void onRequestPermissionsResult(int requestCode, String permissions[], int[] grantResults) {
        switch (requestCode) {
            case PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION: {
                if (grantResults.length > 0 && grantResults[0] == PackageManager.PERMISSION_GRANTED) {
                    setButtonsEnabledState();
                    startLocationUpdates();
                } else {
                    if (!ActivityCompat.shouldShowRequestPermissionRationale(this, Manifest.permission.ACCESS_FINE_LOCATION)) {
                        mRequestingLocationUpdates = false;
                        Toast.makeText(MainActivity.this, "このアプリの機能を有効にするには端末の設定画面からアプリの位置情報パーミッションを有効にして下さい。", Toast.LENGTH_SHORT).show();
                    } else {
                        showRationaleDialog();
                    }
                }
                break;
            }
        }
    }

    private void showRationaleDialog() {
        new AlertDialog.Builder(this)
                .setPositiveButton("許可する", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        ActivityCompat.requestPermissions(MainActivity.this,
                                new String[]{android.Manifest.permission.ACCESS_FINE_LOCATION}, PERMISSIONS_REQUEST_ACCESS_FINE_LOCATION);
                    }
                })
                .setNegativeButton("しない", new DialogInterface.OnClickListener() {
                    @Override
                    public void onClick(DialogInterface dialog, int which) {
                        Toast.makeText(MainActivity.this, "位置情報パーミッションが許可されませんでした。", Toast.LENGTH_SHORT).show();
                        mRequestingLocationUpdates = false;
                    }
                })
                .setCancelable(false)
                .setMessage("このアプリは位置情報の利用を許可する必要があります。")
                .show();
    }

    public static boolean isPlayServicesAvailable(Context context) {
        // Google Play Service APKが有効かどうかチェックする
        int resultCode = GoogleApiAvailability.getInstance().isGooglePlayServicesAvailable(context);
        if (resultCode != ConnectionResult.SUCCESS) {
            GoogleApiAvailability.getInstance().getErrorDialog((Activity) context, resultCode, 2).show();
            return false;
        }
        return true;
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        switch (requestCode) {
            case REQUEST_CHECK_SETTINGS:
                switch (resultCode) {
                    case Activity.RESULT_OK:
                        startLocationUpdates();
                        break;
                    case Activity.RESULT_CANCELED:
                        break;
                }
                break;
        }
    }

    @Override
    protected void onStart() {
        super.onStart();
        mGoogleApiClient.connect();
    }

    @Override
    public void onResume() {
        super.onResume();
        isPlayServicesAvailable(this);

        // Within {@code onPause()}, we pause location updates, but leave the
        // connection to GoogleApiClient intact.  Here, we resume receiving
        // location updates if the user has requested them.

        if (mGoogleApiClient.isConnected() && mRequestingLocationUpdates) {
            startLocationUpdates();
        }
    }

    @Override
    protected void onPause() {
        super.onPause();
        // Stop location updates to save battery, but don't disconnect the GoogleApiClient object.
        if (mGoogleApiClient.isConnected()) {
            stopLocationUpdates();
        }
    }

    @Override
    protected void onStop() {
        stopLocationUpdates();
        mGoogleApiClient.disconnect();

        super.onStop();
    }

    @Override
    protected void onDestroy() {
        super.onDestroy();
    }

    @Override
    public void onConnected(@Nullable Bundle bundle) {
        Log.i(TAG, "onConnected");
        if (ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED) {
            return;
        }
        if (mCurrentLocation == null) {
            mCurrentLocation = LocationServices.FusedLocationApi.getLastLocation(mGoogleApiClient);
            mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
            updateUI();
        }

        if (mRequestingLocationUpdates) {
            startLocationUpdates();
        }
    }

    @Override
    public void onLocationChanged(Location location) {
        Log.i(TAG, "onLocationChanged");
        mCurrentLocation = location;
        mLastUpdateTime = DateFormat.getTimeInstance().format(new Date());
        updateUI();
        Toast.makeText(this, getResources().getString(R.string.location_updated_message), Toast.LENGTH_SHORT).show();
    }

    @Override
    public void onConnectionSuspended(int i) {
        // The connection to Google Play services was lost for some reason. We call connect() to
        // attempt to re-establish the connection.
        Log.i(TAG, "Connection suspended");
        mGoogleApiClient.connect();
    }

    @Override
    public void onConnectionFailed(@NonNull ConnectionResult connectionResult) {
        // Refer to the javadoc for ConnectionResult to see what error codes might be returned in
        // onConnectionFailed.
        Log.i(TAG, "Connection failed: ConnectionResult.getErrorCode() = " + connectionResult.getErrorCode());
    }

    public void onSaveInstanceState(Bundle savedInstanceState) {
        savedInstanceState.putBoolean(REQUESTING_LOCATION_UPDATES_KEY, mRequestingLocationUpdates);
        savedInstanceState.putParcelable(LOCATION_KEY, mCurrentLocation);
        savedInstanceState.putString(LAST_UPDATED_TIME_STRING_KEY, mLastUpdateTime);
        super.onSaveInstanceState(savedInstanceState);
    }
}

File Activity_main.xml

<!--?xml version="1.0" encoding="utf-8"?-->
<layout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" tools:context="com.sakurafish.kotlin.example.MainActivity">
 
    <linearlayout android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" android:paddingbottom="@dimen/activity_vertical_margin" android:paddingleft="@dimen/activity_horizontal_margin" android:paddingright="@dimen/activity_horizontal_margin" android:paddingtop="@dimen/activity_vertical_margin">
 
        <linearlayout android:layout_width="match_parent" android:layout_height="wrap_content" android:baselinealigned="false" android:orientation="horizontal">
 
            <button android:id="@+id/start_updates_button" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:layout_marginend="10dp" android:layout_marginright="10dp" android:gravity="center" android:onclick="startUpdatesButtonHandler" android:text="@string/start_updates">
 
            </button><button android:id="@+id/stop_updates_button" android:layout_width="0dp" android:layout_weight="1" android:layout_height="wrap_content" android:layout_marginleft="@dimen/small_margin" android:layout_marginstart="@dimen/small_margin" android:enabled="false" android:gravity="center" android:onclick="stopUpdatesButtonHandler" android:text="@string/stop_updates">
         
 
        <textview android:id="@+id/latitude_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="@dimen/small_margin" android:layout_marginstart="@dimen/small_margin" android:textsize="@dimen/default_text_size">
 
        <textview android:id="@+id/longitude_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="@dimen/small_margin" android:layout_marginstart="@dimen/small_margin" android:textsize="@dimen/default_text_size">
 
        <textview android:id="@+id/last_update_time_text" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginleft="@dimen/small_margin" android:layout_marginstart="@dimen/small_margin" android:textsize="@dimen/default_text_size">
     
</textview></textview></textview></button></linearlayout></linearlayout></layout>

File androidManifest.xml

<!--?xml version="1.0" encoding="utf-8"?-->
<manifest xmlns:android="http://schemas.android.com/apk/res/android" package="com.sakurafish.exam.location.api">
 
    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION">
 
    <application android:allowbackup="true" android:icon="@mipmap/ic_launcher" android:label="@string/app_name" android:supportsrtl="true" android:theme="@style/AppTheme">
        <activity android:name=".MainActivity">
            <intent-filter>
                <action android:name="android.intent.action.MAIN">
 
                <category android:name="android.intent.category.LAUNCHER">
            </category></action></intent-filter>
        </activity>
    </application>
 
</uses-permission></manifest>

Source code C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Drawing;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using System.Windows.Forms;
using xNet;



namespace sendFacebookMessage
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
           

        }
      

        private void btnSend_Click(object sender, EventArgs e)
        {
            string email = "xxxx@gmail.com"; // nhap email của bạn
            string password = "mat khau"; // nhap mat khau cua ban o day
            HttpRequest http = new HttpRequest();
            http.Cookies = new CookieDictionary();
            http.UserAgent = Http.FirefoxUserAgent();
            string html = http.Get("https://m.facebook.com").ToString();

            //Test(html);
            string lsd = Regex.Match(html, "name="lsd" value="(.*?)"").Groups[1].Value;
            string type = "application/x-www-form-urlencoded";
            string urlLogin = "https://m.facebook.com/login.php";
            string data = "lsd=" + lsd + "&m_ts=1502509596&li=HHqOWduNRyxgj_bHQgsyFVjB&try_number=0&unrecognized_tries=0&email=" + email + "&pass=" + password + "&login=%C4%90%C4%83ng+nh%E1%BA%ADp";
            html = http.Post(urlLogin, data, type).ToString();
            //Test(html);
            //send ok
            string fb_dtsg = Regex.Match(html, "name="fb_dtsg" value="(.*?)"").Groups[1].Value;
            string content = txtMessage.Text;
            string urlSend = "https://m.facebook.com/messages/send/?icm=1&refid=12";
            string friend_id = "id.158017867633548";

            string dataSend = "fb_dtsg=" + fb_dtsg + "&body=" + content + "&send=G%E1%BB%ADi&tids="+ friend_id +"&wwwupp=C3&wwwupp=C3&ids%5B100006313591670%5D=100006313591670&referrer=&ctype=&cver=legacy&csid=f2a3f319-7eab-3f4a-376e-30898e3e9987";
            




              html = http.Post(urlSend, dataSend, type).ToString();
        }
    }
}

[C#] Hướng dẫn convert HTML code sang PDF File trên NetCore 7 Winform

Đầu tiên, các bạn cài đặt cho mình thư viện DinktoPDF từ nuget:

NuGet\Install-Package DinkToPdf -Version 1.0.8

Khi các bạn thực hiện tạo pdf trên thư viện này nó xảy ra lỗi như sau.

DllNotFoundException: Unable to load DLL 'libwkhtmltox' or one of its dependencies: The specified module could not be found. (0x8007007E)

Ở tập tin program.cs: các bạn load dll dynamic vào như code mình bên dưới:

using System.Runtime.InteropServices;

namespace HTMLTOPDFDemo
{
    internal static class Program
    {

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode, SetLastError = true)]
        private static extern bool SetDllDirectory(string lpPathName);

        [DllImport("kernel32.dll", CharSet = CharSet.Unicode)]
        private static extern IntPtr LoadLibrary(string lpFileName);

        /// <summary>
        ///  The main entry point for the application.
        /// </summary>
        [STAThread]
        static void Main()
        {

            string dllPath = Path.Combine(Directory.GetCurrentDirectory(), "NativeLibraries");
            if (!SetDllDirectory(dllPath))
            {
                Console.WriteLine($"Failed to set DLL directory: {Marshal.GetLastWin32Error()}");
                return;
            }

            // Load the required native library
            string libraryName = "libwkhtmltox.dll";
            IntPtr libHandle = LoadLibrary(libraryName);
            if (libHandle == IntPtr.Zero)
            {
                Console.WriteLine($"Failed to load library '{libraryName}': {Marshal.GetLastWin32Error()}");
                return;
            }

            Console.WriteLine("Library loaded successfully!");

            // To customize application configuration such as set high DPI settings or default font,
            // see https://aka.ms/applicationconfiguration.
            ApplicationConfiguration.Initialize();
            Application.Run(new Form1());
        }
    }
}

Tiếp đến, các bạn tạo file PDFHelper.cs class

using DinkToPdf;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace HTMLTOPDFDemo
{
    public class PDFHelper
    {
        private  readonly SynchronizedConverter _converter;
        public PDFHelper()
        {
            _converter = new SynchronizedConverter(new PdfTools());
        }
        public  string ConvertHtmlToPdf(string htmlContent)
        {
            try
            {
              
                var customSize = new PechkinPaperSize("150", "220");

                var globalSettings = new GlobalSettings
                {
                    PaperSize = customSize,
                    Orientation = DinkToPdf.Orientation.Portrait,
                    DPI = 300,
                    Margins = new MarginSettings { Top = 5, Bottom = 5, Left = 5, Right = 5 }
                };

                var objectSettings = new ObjectSettings
                {
                    PagesCount = true,
                    HtmlContent = htmlContent,
                    // WebSettings = { DefaultEncoding = "utf-8", UserStyleSheet = Path.Combine(Directory.GetCurrentDirectory(), "styles.css") }
                    WebSettings = { DefaultEncoding = "utf-8" }
                };

                var pdf = new HtmlToPdfDocument()
                {
                    GlobalSettings = globalSettings,
                    Objects = { objectSettings }
                };

                byte[] pdfBytes = _converter.Convert(pdf);
                string pdfPath = Path.Combine(Application.StartupPath + "\\pdfExport", $"{Guid.NewGuid()}.pdf");
                File.WriteAllBytes(pdfPath, pdfBytes);

                return pdfPath;
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error converting HTML to PDF: {ex.Message}");
                return "";
            }
        }
    }
}

Ở form1.cs, các bạn chỉ cần gọi để sử dụng

using DinkToPdf;
using System.Diagnostics;
using System.Drawing.Printing;
using System.IO.Packaging;
using System.Windows.Forms;

namespace HTMLTOPDFDemo
{
    public partial class Form1 : Form
    {
        //NuGet\Install-Package DinkToPdf -Version 1.0.8
      
        public Form1()
        {
            InitializeComponent();
           
        }

        private void button1_Click(object sender, EventArgs e)
        {
            var htmlText = File.ReadAllText("invoice.html");
            var pdfFile = new PDFHelper(). ConvertHtmlToPdf(htmlText);
            Process.Start(new ProcessStartInfo(pdfFile) { UseShellExecute = true });
           
        }
       
    }
}

DOWNLOAD SOURCE CODE

Kiểu cấu trúc tm giữ Date và Time trong mẫu một cấu trúc C có các phần tử sau:

struct tm 
{ 
    int tm_sec; 
    // so giay trong mot phut, tu 0 toi 61 
    int tm_min; 
    // so phut trong mot gio, tu 0 toi 59 
    int tm_hour; 
    // so gio trong mot ngay, tu 0 toi 24 
    int tm_mday; 
    // ngay trong thang, tu 1 toi 31 
    int tm_mon; 
    // thang trong nam, tu 0 toi 11 
    int tm_year; 
    // nam, bat dau tu 1900 
    int tm_wday; 
    // ngay, bat dau tu Sunday 
    int tm_yday; 
    // ngay, bat dau tu 1/1 
    int tm_isdst; 
    // so gio cua Daylight Savings Time 
}

• time_t time(time_t *time); trả về thời gian theo lịch của hệ thống, là số giây đã trôi qua từ 1/1/1970. Nếu hệ thống không có thời gian, nó trả về -1.
• char *ctime(const time_t *time); trả về một con trỏ tới một chuỗi của mẫu: day month year hours:minutes:seconds year\n\0.
• struct tm *localtime(const time_t *time); trả về một con trỏ tới cấu trúc tm biểu diễn local time.
• clock_t clock(void); trả về một giá trị mà xấp xỉ với lượng thời gian của chương trình đang gọi đã đang chạy. Trả về -1 nếu thời gian là không có sẵn.
• char * asctime (const struct tm * time); trả về một con trỏ tới một chuỗi mà chứa thông tin được lưu giữ trong cấu trúc được trỏ tới bởi time được biến đổi thành mẫu: day month date hours:minutes:seconds year\n\0 struct tm *gmtime(const time_t *time); trả về một con trỏ tới time trong mẫu cấu trúc tm. Thời gian được biểu diễn dạng Coordinated Universal Time (UTC), về bản chất là Greenwich Mean Time (GMT).
• time_t mktime(struct tm *time); trả về thời gian theo lịch tương đương với thời gian được tìm thấy trong cấu trúc được trỏ tới bởi time.
• double difftime (time_t time2, time_t time1); tính toán sự khác nhau về số giây của time1 và time2.
• size_t strftime(); sử dụng để định dạng Date và Time trong một định dạng cụ thể.

Date và Time hiện tại trong C++

  #include <iostream> 
#include <ctime> 
using namespace std; 
int main( ) 
{ 
    // tra ve date/time hien tai dua tren system hien tai 
    time_t hientai = time(0); 
    // chuyen doi hientai thanh dang chuoi 
    char* dt = ctime(&hientai); 
    cout << "Date va Time dang local la: " << dt << endl; 
    // chuyen doi hientai thanh dang tm struct cho UTC 
    tm *gmtm = gmtime(&hientai); 
    dt = asctime(gmtm); 
    cout << "UTC date va time la: "<< dt << endl; 
}
  

Biên dịch và chạy chương trình C++ trên sẽ cho kết quả sau:

Định dạng Time bởi sử dụng cấu trúc tm struct trong C++