WH_GETMESSAGE全局钩子不工作

问题描述

我想设置一个全局钩子的GetMessage上的所有线程。这是我的DLL：

I am trying to set a global GetMessage hook on all threads. This is my DLL:

#include <windows.h>

__declspec(dllexport) LRESULT CALLBACK GetMsgProc(int nCode, WPARAM wParam, LPARAM lParam)
{
  MessageBeep(0);

  return CallNextHookEx(NULL, nCode, wParam, lParam);
}

正如你所看到的，它的并不多。我只是想它来调用的MessageBeep时，它被称为

As you can see, it's not much. I just want it to call MessageBeep whenever it's called.

#include <windows.h>

typedef LRESULT (CALLBACK *LPGetMsgProc)(int nCode, WPARAM wParam, LPARAM lParam);

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR pCmdLine, int nCmdShow)
{
  if(!(HMODULE hDll = LoadLibrary("library.dll")))
    return 1;
  if(!(LPGetMsgProc pfnProc = (LPGetMsgProc)GetProcAddress(hDll, "GetMsgProc@12")))
    return 2;

  HHOOK hMsgHook = SetWindowsHookEx(WH_GETMESSAGE, pfnProc, hInstance, 0);

  MSG msg;
  while(GetMessage(&msg, NULL, 0, 0) > 0) {}

  UnhookWindowsHookEx(hMsgHook);

  return 0;
}

我的WinMain函数加载库，获取程序，并设置了钩。然而，的MessageBeep永远不会被调用。是有什么我做错了？

My WinMain loads the library, gets the procedure and sets the hook. However, MessageBeep is never being called. Is there something I'm doing wrong here?

此外，另一件事情一直困扰着我。在此呼吁：

Also, one other thing has been bothering me. In this call:

if(!(LPGetMsgProc pfnProc = (LPGetMsgProc)GetProcAddress(hDll, "GetMsgProc@12")))

我被迫使用GetMsgProc @ 12，因为我无法得到它的权利任何其他方式。有人能告诉我，我应该如何使用DEF文件或别的东西，所以我可以只为GetMsgProc？虽然MSDN指出，由于我在声明中有__declspec（dllexport）的，我不会需要它...

I was forced to use "GetMsgProc@12" because I couldn't get it right any other way. Can somebody please tell me how I'm supposed to use a .def file or something else so I can just have it as "GetMsgProc"? Though MSDN stated that since I have __declspec(dllexport) in my declaration I wouldn't need it...

我的IDE是code ::使用MinGW块。先谢谢了。

My IDE is Code::Blocks with MinGW. Thanks in advance.

推荐答案

第三个参数...

HHOOK hMsgHook = SetWindowsHookEx(WH_GETMESSAGE, pfnProc, hInstance, 0);

...是传递到WinMain函数的句柄。但它需要引用到回调函数所在的DLL - 你的情况，这会是 hDLL

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