Example code for screenshots using WeChat PC dll library

This article mainly introduces in detail the use of WeChat PC screenshot dll library to implement the WeChat screenshot function. It has a certain reference value. Interested friends can refer to it.

The examples in this article are shared with everyone. The screenshot dll library is used to implement the WeChat screenshot function for your reference. The specific content is as follows

ScreenForm.cs code:

using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
using System.Windows.Forms;

namespace screenT
{
  public partial class ScreenForm : Form
  {
    public ScreenForm()
    {
      InitializeComponent();
    }


    private void ScreenCapture()
    {
      DLL.PrScrn();
    }

    protected override void WndProc(ref Message m)
    {
      base.WndProc(ref m);
      Hotkey.ProcessHotKey(m);
    }

    private void button1_Click(object sender, EventArgs e)
    {
      DLL.PrScrn();
    }

    private void Form1_Load(object sender, EventArgs e)
    {
      //注册热键(窗体句柄,热键ID,辅助键,实键)  
      try
      {
        Hotkey.Regist(Handle, HotkeyModifiers.MOD_ALT, Keys.F1, ScreenCapture);
      }
      catch (Exception te)
      {
        MessageBox.Show("Alt + A 热键被占用");
      }
    }

    private void Form1_FormClosed(object sender, FormClosedEventArgs e)
    {
      //注消热键(句柄,热键ID)  
      Hotkey.UnRegist(Handle, ScreenCapture);
    }
  }

  public class DLL
  {
    [DllImport("PrScrn.dll", EntryPoint = "PrScrn")]
    public static extern int PrScrn(); //与dll中一致  
  }


  public static class Hotkey
  {
    #region 系统api

    [DllImport("user32.dll")]
    [return: MarshalAs(UnmanagedType.Bool)]
    private static extern bool RegisterHotKey(IntPtr hWnd, int id, HotkeyModifiers fsModifiers, Keys vk);

    [DllImport("user32.dll")]
    private static extern bool UnregisterHotKey(IntPtr hWnd, int id);

    #endregion

    public delegate void HotKeyCallBackHanlder();

    private const int WM_HOTKEY = 0x312;
    private static int keyid = 10;

    private static readonly Dictionary<int, HotKeyCallBackHanlder> keymap =
      new Dictionary<int, HotKeyCallBackHanlder>();

    /// <summary>
    ///   注册快捷键
    /// </summary>
    /// <param name="hWnd">持有快捷键窗口的句柄</param>
    /// <param name="fsModifiers">组合键</param>
    /// <param name="vk">快捷键的虚拟键码</param>
    /// <param name="callBack">回调函数</param>
    public static void Regist(IntPtr hWnd, HotkeyModifiers fsModifiers, Keys vk, HotKeyCallBackHanlder callBack)
    {
      int id = keyid++;
      if (!RegisterHotKey(hWnd, id, fsModifiers, vk))
        throw new Exception("regist hotkey fail.");
      keymap[id] = callBack;
    }

    /// <summary>
    ///   注销快捷键
    /// </summary>
    /// <param name="hWnd">持有快捷键窗口的句柄</param>
    /// <param name="callBack">回调函数</param>
    public static void UnRegist(IntPtr hWnd, HotKeyCallBackHanlder callBack)
    {
      foreach (var var in keymap)
      {
        if (var.Value == callBack)
          UnregisterHotKey(hWnd, var.Key);
      }
    }

    /// <summary>
    ///   快捷键消息处理
    /// </summary>
    public static void ProcessHotKey(Message m)
    {
      if (m.Msg == WM_HOTKEY)
      {
        int id = m.WParam.ToInt32();
        HotKeyCallBackHanlder callback;
        if (keymap.TryGetValue(id, out callback))
        {
          callback();
        }
      }
    }
  }

  public enum HotkeyModifiers
  {
    MOD_ALT = 0x1,
    MOD_CONTROL = 0x2,
    MOD_SHIFT = 0x4,
    MOD_WIN = 0x8
  }
}

The running result is as shown:

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