hook api的乙個簡單的例子

乙個簡單的console工程,vc6,vc7在win2k pro,server上除錯通過.

#include

#include

#include

#pragma comment(lib,"dbghelp.lib")

#pragma comment(lib,"user32.lib")

typedef int (__stdcall *old_messagebox)( hwnd hwnd, lpctstr lptext, lpctstr lpcaption,uint utype );

old_messagebox g_procoldmessagebox = null;

int __stdcall hook_messagebox( hwnd hwnd, lpctstr lptext, lpctstr lpcaption,uint utype)

int replace_iat(const char *pdllname,const char *papiname,bool breplace)

++pimageimport;

}if (! pimageimport->name)

return 2;

pimagethunkoriginal = (pimage_thunk_data)((pbyte)hprocess+pimageimport->originalfirstthunk  );

pimagethunkreal = (pimage_thunk_data)((pbyte)hprocess+pimageimport->firstthunk   );

while (pimagethunkoriginal->u1.function)

else

pimagethunkreal->u1.function = (dword)g_procoldmessagebox;

dword dwoldprotect;

virtualprotect(mbi_thunk.baseaddress, mbi_thunk.regionsize, mbi_thunk.protect, &dwoldprotect);

break;}}

++pimagethunkoriginal;

++pimagethunkreal;

}return 0;

}int main()

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