如何正确钩WM_COMMAND

How properly hook WM_COMMAND

本文关键字：COMMAND WM 何正确      更新时间：2023-10-16

我正在尝试在 mfc 窗口中挂钩按钮单击。我用了WM_COMMAND和WM_NOTIFY。对于测试，如果单击该按钮，挂钩必须创建一个消息框。问题是它对按钮点击没有反应。以下是对WM_COMMAND和WM_NOTIFY做出反应的代码：

LPMSG msg = (LPMSG)lParam;
    switch( msg->message )
    {
    case WM_COMMAND:
        MessageBox( NULL,"HOOK","YOOOO",MB_ICONEXCLAMATION );
        break;
    case WM_NOTIFY:
        MessageBox( NULL,"HOOK","YOOOOO",MB_ICONEXCLAMATION );
        break;
    }

这是钻孔 dll 的代码：

#include <Windows.h>
#include "FindingWindow.h"
#pragma comment( linker,"/SECTION:.SHARED,RWS" )
#pragma data_seg( ".SHARED" )
CaptureTextWindow* ctw;
HHOOK hook = 0;
HMODULE hInstance = 0;
HWND hWndServer = NULL;
#pragma data_seg()
static LRESULT CALLBACK msghook(int nCode, WPARAM wParam, LPARAM lParam);
__declspec(dllexport) BOOL clearMyHook(HWND hWnd);
BOOL APIENTRY DllMain( HINSTANCE hInst, DWORD ul_reason_for_call, LPVOID lpReserved )
{
    switch( ul_reason_for_call )
    {
    case DLL_PROCESS_ATTACH:
        hInstance =  hInst;
        return TRUE;
    case DLL_PROCESS_DETACH:
        if(hWndServer != NULL)
          clearMyHook(hWndServer);
        return TRUE;
    }   
    return TRUE;
}

__declspec(dllexport) BOOL WINAPI setMyHook(HWND hWnd)
  {
   if(hWndServer != NULL)
      return FALSE;
   hook = SetWindowsHookEx(
                           WH_CALLWNDPROC,
                           (HOOKPROC)msghook,
                           hInstance,
                           0);
   if(hook != NULL)
   { /* success */
      hWndServer = hWnd;
      return TRUE;
   } /* success */
   return FALSE;
}
__declspec(dllexport) BOOL clearMyHook(HWND hWnd)
{
    if(hWnd != hWndServer)
       return FALSE;
    BOOL unhooked = UnhookWindowsHookEx(hook);
    if(unhooked)
       hWndServer = NULL;
    return unhooked;
}
static LRESULT CALLBACK msghook( int nCode,        // hook code
                                   WPARAM wParam ,  // message identifier
                                   LPARAM lParam )  
{
    if( nCode < 0 )
    {
        CallNextHookEx( hook, nCode, wParam, lParam );
        return 0;
    }
    LPMSG msg = (LPMSG)lParam;
    switch( msg->message )
    {
    case WM_COMMAND:
        MessageBox( NULL,"HOOK","YOOOO",MB_ICONEXCLAMATION );
        break;
    case WM_NOTIFY:
        MessageBox( NULL,"HOOK","YOOOOO",MB_ICONEXCLAMATION );
        break;
    }
    return CallNextHookEx( hook, nCode, wParam, lParam );
}

我不仅使用WM_COMMAND因为我认为mb它会起作用，但它没有。谢谢你的回答。

WH_CALLWNDPROC钩子的lParam是 CWPSTRUCT 类型。您的CallWndProc应如下所示：

// ...
const CWPSTRUCT& cwps = *(CWPSTRUCT*)lParam;
switch ( cwps.message ) {
case WM_COMMAND:
    MessageBox( ... );
    break;
// ...
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