Ну более подробно MSDN и книга Д.Рихтера "Windows - для проффессионалов"
Вот пример я выдрал из своего проекта:
AppDLL.h
| Код |
/********************************************************************
Module : AppDll.h
Subject : <
********************************************************************/
#ifndef DLLLOADAPI
#define DLLLOADAPI extern "C" __declspec(dllimport)
#endif
#include <windows.h>
//-------------------------------------------------------------------
DLLLOADAPI LRESULT CALLBACK MouseProc(
int nCode, // hook code
WPARAM wParam, // message identifier
LPARAM lParam // mouse coordinates
);
//-------------------------------------------------------------------
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AppDll.cpp
| Код |
/********************************************************************
Module : AppDll.cpp
Subject : <
********************************************************************/
#define DLLLOADAPI extern "C" __declspec(dllexport)
#include "AppDLL.h"
UINT WM_RECTLEAVE;
LRESULT CALLBACK MouseProc(
int nCode, // hook code
WPARAM wParam, // message identifier
LPARAM lParam // mouse coordinates
)
{
MOUSEHOOKSTRUCT * mc= (MOUSEHOOKSTRUCT *) lParam;
static HWND hwnd=0;
if (hwnd != 0)
{
if (hwnd != mc->hwnd) // || (!PtInRect(&rect,mc->pt)))
{
PostMessage(hwnd,WM_RECTLEAVE,0,0);
hwnd=mc->hwnd;
}
}
else hwnd=mc->hwnd;
return CallNextHookEx(NULL,nCode,wParam,lParam);
}
BOOL WINAPI DllMain(HINSTANCE hinst, unsigned long reason, void*)
{
switch( reason )
{
case DLL_PROCESS_ATTACH:
WM_RECTLEAVE=RegisterWindowMessage("WM_RECTLEAVE");
// Initialize once for each new process.
// Return FALSE to fail DLL load.
break;
case DLL_THREAD_ATTACH:
// Do thread-specific initialization.
break;
case DLL_THREAD_DETACH:
// Do thread-specific cleanup.
break;
case DLL_PROCESS_DETACH:
// Perform any necessary cleanup.
break;
}
return TRUE; // Successful DLL_PROCESS_ATTACH.
}
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AppDll.def
| Код |
LIBRARY AppDll
DESCRIPTION 'Aplication DLL'
EXPORTS
MouseProc @1
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Ну и сама иницилизация хука в теле программы
| Код |
AppDll=LoadLibrary("AppDll.dll");
if (AppDll !=NULL)
{
typedef LRESULT (CALLBACK *TMouseProc)(int, WPARAM, LPARAM);
hook = SetWindowsHookEx(WH_MOUSE, (TMouseProc) GetProcAddress(AppDll,"MouseProc"),AppDll,0);
}
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Ну и убийство онного
| Код |
if (hook !=NULL) UnhookWindowsHookEx(hook);
hook=NULL;
if (AppDll !=NULL) FreeLibrary(AppDll);
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