用微信电脑端截图dll库来实现微信截图功能

本文实例为大家分享了截图dll库实现微信截图功能 ，供大家参考，具体内容如下

ScreenForm.cs代码:

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    }  }

运行结果如图:

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