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:
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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
}
}
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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快网idc。
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