使用微信PC端的截图dll库实现微信截图功能

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:

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。