SetWindowsHookEx WH_KEYBOARD_LL Ereignisse nicht immer
-
20-09-2019 - |
Frage
Ich bin mit SetWindowsHookEx (), um eine Tastatur-Hook zu erstellen. Die Schaffung scheint erfolgreich zu sein, aber das Verfahren, das nie aufgerufen wird, registriert. Gibt es etwas, was ich falsch mache?
#region Windows API Functions Declarations
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern int SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern bool UnhookWindowsHookEx(int idHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern int CallNextHookEx(int idHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
#endregion
=
private void CreateHook()
{
int id_hook = (int)HookType.WH_KEYBOARD_LL;
HookProc lpfn = new HookProc(this.KeyboardHookProc);
using (ProcessModule curModule = Process.GetCurrentProcess().MainModule)
hHook = SetWindowsHookEx(id_hook, lpfn, GetModuleHandle(curModule.ModuleName), 0);
if (hHook == 0)
throw new Exception("could not start monitoring mouse events");
}
=
private int KeyboardHookProc(int code, IntPtr wParam, IntPtr lParam)
{
if (code >= 0)
Console.WriteLine((Keys)wParam.ToInt32());
return CallNextHookEx(0, code, wParam, lParam);
}
=
Lösung
Ihre P / Invoke Erklärungen sind falsch, Sie verwenden int wo IntPtr erforderlich ist und bis idHook und hHook mischen. Nachdem Sie den Code bearbeiten, das funktioniert:
IntPtr hHook;
private delegate IntPtr HookProc(int nCode, IntPtr wp, IntPtr lp);
HookProc lpfn;
private IntPtr KeyboardHookProc(int code, IntPtr wParam, IntPtr lParam) {
if (code >= 0)
Console.WriteLine((Keys)wParam.ToInt32());
return CallNextHookEx(hHook, code, wParam, lParam);
}
private void CreateHook() {
int id_hook = 13;
lpfn = new HookProc(this.KeyboardHookProc);
using (ProcessModule curModule = Process.GetCurrentProcess().MainModule)
hHook = SetWindowsHookEx(id_hook, lpfn, GetModuleHandle(curModule.ModuleName), 0);
if (hHook == IntPtr.Zero)
throw new Exception("could not start monitoring mouse events");
}
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr SetWindowsHookEx(int idHook, HookProc lpfn, IntPtr hInstance, int threadId);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern bool UnhookWindowsHookEx(IntPtr hHook);
[DllImport("user32.dll", CharSet = CharSet.Auto, CallingConvention = CallingConvention.StdCall)]
private static extern IntPtr CallNextHookEx(IntPtr hHook, int nCode, IntPtr wParam, IntPtr lParam);
[DllImport("kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern IntPtr GetModuleHandle(string lpModuleName);
Lizenziert unter: CC-BY-SA mit Zuschreibung
Nicht verbunden mit StackOverflow