C# KeyBoradProc
时间: 2023-10-19 15:20:09 浏览: 41
C#中的KeyboardProc是用于处理键盘消息的回调函数,它被用于Windows API中的键盘钩子。当应用程序安装键盘钩子后,它会接收到所有键盘消息,可以通过KeyboardProc函数来处理这些消息。
以下是一个简单的示例:
```csharp
using System;
using System.Runtime.InteropServices;
class KeyboardHook
{
private delegate IntPtr KeyboardProc(int nCode, IntPtr wParam, IntPtr lParam);
private static KeyboardProc _hookCallback;
private const int WH_KEYBOARD_LL = 13;
private const int WM_KEYDOWN = 0x0100;
private static IntPtr _hookId = IntPtr.Zero;
public static void Main()
{
_hookCallback = HookCallback;
_hookId = SetHook(_hookCallback);
Console.WriteLine("Press any key to exit.");
Console.ReadKey();
UnhookWindowsHookEx(_hookId);
}
private static IntPtr SetHook(KeyboardProc proc)
{
using (var curProcess = System.Diagnostics.Process.GetCurrentProcess())
using (var curModule = curProcess.MainModule)
{
return SetWindowsHookEx(WH_KEYBOARD_LL, proc, GetModuleHandle(curModule.ModuleName), 0);
}
}
private static IntPtr HookCallback(int nCode, IntPtr wParam, IntPtr lParam)
{
if (nCode >= 0 && wParam == (IntPtr)WM_KEYDOWN)
{
int keyCode = Marshal.ReadInt32(lParam);
Console.WriteLine($"Key pressed: {(ConsoleKey)keyCode}");
}
return CallNextHookEx(_hookId, nCode, wParam, lParam);
}
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr SetWindowsHookEx(int idHook, KeyboardProc lpfn, IntPtr hMod, uint dwThreadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
private static extern bool UnhookWindowsHookEx(IntPtr hhk);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr CallNextHookEx(IntPtr hhk, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
}
```
在上述示例中,我们定义了一个KeyboardHook类,并在Main方法中进行初始化和启动。首先,我们定义了一个KeyboardProc委托类型,它用于定义回调函数。然后,我们定义了一些常量,包括钩子类型和键盘消息类型。接下来,我们使用SetWindowsHookEx函数安装了一个键盘钩子,并传入了我们定义的回调函数。在回调函数中,我们检查键盘消息是否为按下键盘按键,并将其输出到控制台。最后,我们在程序退出前卸载钩子。
请注意,这只是一个简单的示例,真正的应用程序可能需要更复杂的逻辑来处理键盘消息。