I've downloaded and compiled the Microsoft detouring library. Inside my project I've included the header file and added the .lib file as a dependency. Everything compiles without errors. Now I've been trying to detour DrawText, but for some reason that detoured function doesn't get called at all. Similiarly I tried detouring the Sleep function and that worked as intended and the function I detoured to was called.
I'm not very well-versed in the business of API programming nor any other low level activities. I suspect it might have something to do with the fact that I'm trying to do this inside a console application instead of having the detouring done inside a DLL. I just find it strange that it would be able to detour Sleep in that case.
Is there something wrong with my approach or does the fault lie in the code?
#include <windows.h>
#include <stdio.h>
#include "detours.h"
int ( WINAPI *Real_DrawText )(HDC a0, LPCSTR a1, int a2, LPRECT a3, UINT a4) = DrawTextA;
int Mine_DrawText(HDC hdc, LPCSTR text, int nCount, LPRECT lpRect, UINT uOptions)
{
printf("TEST");
return Real_DrawText(hdc, text, nCount, lpRect, uOptions);
}
int main(int argc, char **argv)
{
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
DetourAttach(&(PVOID&)Real_DrawText, Mine_DrawText);
DetourTransactionCommit();
printf("Calling Sleep\n");
Sleep(1000);
printf("Second callout");
Sleep(5000);
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
DetourDetach(&(PVOID&)Real_DrawText, Mine_DrawText);
DetourTransactionCommit();
return 0;
}