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>持有快捷键窗口的句柄</param> /// <param>组合键</param> /// <param>快捷键的虚拟键码</param> /// <param>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>持有快捷键窗口的句柄</param> /// <param>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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