autohook.c

window编程,非常的好

#if _MSC_VER > 1000
#pragma once
#endif

#define  WIN32_LEAN_AND_MEAN
#include <windows.h>
#include "ApiHooks.h"


int  (WINAPI *OriginalMessageBoxA)(HWND  hWnd,LPCTSTR  lpText,LPCTSTR  lpCaption,
     UINT  uType);
    
int WINAPI NewMessageBoxA(HWND  hWnd,LPCTSTR  lpText,LPCTSTR  lpCaption,
    UINT  uType) {
    return(OriginalMessageBoxA(hWnd, lpText, lpCaption,
		   uType & MB_ICONINFORMATION 
		   ? uType ^ (MB_ICONINFORMATION | MB_ICONEXCLAMATION)
	       : uType));
}


API_HOOK ApiHookChain[3] = {
	{DYNAMIC_HOOKS},
	{"USER32.DLL","MessageBoxA",HOOK_EXACT, NULL, NULL, NewMessageBoxA},
	{HOOKS_END}
};


int MsgBox() {
	 return(MessageBoxA(NULL, "This is illegal", "Warning", MB_ICONINFORMATION));
}
	

int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
                     LPSTR     lpCmdLine, int nCmdShow)
{
	OriginalMessageBoxA = MessageBoxA;
	MsgBox();
    EstablishApiHooks((LPCSTR)ApiHookChain, GetCurrentProcessId());
	return(MsgBox());
}