Question

我正在编写一个围绕Win32钩子的.NET包装器，它可以缓冲WM_CHAR消息，并允许订阅按键，键释放和加速键击等事件。除了我对TranslateAccelerator的调用之外，一切都处于正常工作状态。它在我期望它时返回true（当它在我之前构造的给定表中找到加速器时）但是WM_COMMAND消息似乎没有出现。这是一些相关的代码。

[StructLayout(LayoutKind.Sequential)]
struct MSG {

    IntPtr hWnd;

    WindowsMessages message;

    IntPtr wParam;

    IntPtr lParam;

    UInt32 time;

    POINT pt;
}

delegate IntPtr HOOKPROC(HookCodes nCode, IntPtr wParam, ref MSG lParam);

[DllImport("user32.dll")] 
extern IntPtr CallNextHookEx(IntPtr hhk, HookCodes nCode, IntPtr wParam, ref MSG lParam);

IntPtr HookProcedure(HookCodes nCode, IntPtr wParam, ref MSG lParam) {
    IntPtr result = IntPtr.Zero;
    if(nCode < HookCodes.ACTION) { 
        result = CallNextHookEx(hHook, nCode, wParam, ref lParam);
    } else if(nCode == HookCodes.ACTION && (PeekMessageOptions)wParam == PeekMessageOptions.REMOVE) {

        /*
         * Under these conditions, each message will only be passed onto the switch below once.
         */

        switch(lParam.message) {
            case WindowsMessages.KEYDOWN: 
                //fire keydown events and call TranslateAccelerator/TranslateMessage
                break;
            case WindowsMessages.KEYUP: 
                //fire keyup events
                break;
            case WindowsMessages.COMMAND: 
                //fire accelerator events Ex: Ctrl+F, ALT+M, SHIFT+L
                break;
            case WindowsMessages.CHAR: 
                //place char in buffer
                break;
            default:
                break;
            }
        }
        return result; //Will be zero if action was taken on the message by this procedure.  
    }
}

在KeyPressed（MSG）中，消息的翻译方式如下：

[DllImport("user32.dll")]
extern bool TranslateAccelerator(IntPtr hWnd, IntPtr hAccTable, ref MSG lpMsg);

[DllImport("user32.dll")] 
extern bool TranslateMessage(ref MSG lpMsg);

if(!TranslateAccelerator(hWnd, hAccel, ref msg)){
    TranslateMessage(ref msg);
}

钩子和加速器表的创建如下：

[StructLayout(LayoutKind.Sequential)]
struct ACCEL {

    byte fVirt;

    ushort key;

    ushort cmd;
}

[DllImport("user32.dll")] 
extern uint GetWindowThreadProcessId(IntPtr hWnd, IntPtr lpdwProcessId);

[DllImport("user32.dll")] 
extern IntPtr SetWindowsHookEx(WindowsHooks hook, HookProcedure lpfn, IntPtr hMod, uint dwThreadId);

[DllImport("user32.dll")]
extern IntPtr CreateAcceleratorTable(ACCEL[] lpaccl, int cEntries);

HOOKPROC proc = HookProcedure;
uint pid = GetWindowThreadProcessId(/*IntPtr*/hWnd, IntPtr.Zero);
IntPtr hHook = SetWindowsHookEx(WindowsHooks.GETMESSAGE, proc, IntPtr.Zero, pid);
IntPtr hAccel = CreateAcceleratorTable(/*ACCEL[]*/accelerators, accelerators.Length);

一切正常（例如将事件附加到按键并缓冲WM_CHAR消息），除了我在队列中的任何地方都找不到WM_COMMAND或WM_SYSCOMMAND消息。它们似乎对我的钩子程序不可见，即使TranslateAccelerator在我期望的时候返回true。请注意，当涉及到Win32时，我真的很无能，所以我可能会错过一些对训练有素的眼睛显而易见的东西。但我在我的智慧结束。我已经尝试将挂钩附加到XNA窗口和Windows窗体但没有成功。

Answer 1

您不会使用WM_COMMAND挂钩抓住那些GETMESSAGE条消息。

TranslateAccelerator“将WM_COMMAND或WM_SYSCOMMAND消息直接发送到指定的窗口过程”（参见the documentation），从而绕过消息队列。

你需要一个CALLWNDPROC钩子。

TranslateAccelerator成功，但WM_COMMAND消息未显示

1 个答案: