DetourAttach success but no functions hooked :( - dll

Question

Good morning !
I have recently read articles quite interesting about hooking functions, I have followed one or two tutorials but it never seems to work, I am using Detoured and here is the full code which seems to me perfectly normal :(
#include <stdio.h>
#include <windows.h>
#include "stdafx.h"
#include "detours.h"
#pragma comment(lib, "detours.lib")
int(__stdcall* realFunc)(int) = (int(__stdcall*)(int))(0x004157B0);
void hookedFunc(int num)
{
printf("Test : %d\n", num + 100);
}
BOOL APIENTRY DllMain(HANDLE hModule, DWORD ul_reason_for_call, LPVOID lpReserved)
{
switch (ul_reason_for_call)
{
case DLL_PROCESS_ATTACH:
DetourAttach((PVOID*)(&realFunc), (PVOID)hookedFunc);
break;
case DLL_THREAD_ATTACH:
DetourTransactionBegin();
DetourUpdateThread(GetCurrentThread());
DetourAttach((PVOID*)(&realFunc), (PVOID)hookedFunc);
DetourTransactionCommit();
hookedFunc(100);
break;
case DLL_THREAD_DETACH:
break;
case DLL_PROCESS_DETACH:
DetourDetach((PVOID*)0x004157B0, hookedFunc);
break;
}
return TRUE;
}
When using RemoteDLL and a simple console application as dummy to hook the function, all steps are completed successfully (running as administrator), the memory address to the function I want to be hooked matches, however the code line "printf("Test : %d\n", num + 100);" is not executed, the result does not appears at screen...
If anyone would have an idea about what's going on I would be really happy to hear it !
Thanks in advance !

Answer 1

First, hookedFunc must have the same signature: int __stdcall hookedFunc(int x).
I suppose the following effect of your code: hookedFunc is called each time somebody calls the function at address 0x004157B0. Is it what you expect?
For testing, you call this address. Let me change the code a little to clarify:
extern int __stdcall FunctionIWantToHook(int);
int(__stdcall* realFunc)(int) = FunctionIWantToHook;
...
DetourAttach((PVOID*)(&realFunc), (PVOID)hookedFunc);
FunctionIWantToHook(100); // hookedFunc will be called here