Code injection hook - by namespace

/*
*               little sample for hooking LoadLibrary
*               by namespace
*/

#include <windows.h>
#include <detours.h>

#define WIN32_LEAN_AND_MEAN

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

typedef HRESULT (WINAPI *oLoadLibrary) (LPCSTR lpFile);

oLoadLibrary pLoadLibrary;
DWORD dwLoadLibrary;

HRESULT WINAPI myLoadLibrary(LPCSTR lpFile)
{
    if (lpFile == "forbidden.dll")
    {
        SetLastError(0);

        return ERROR_SUCCESS;
    }

    return pLoadLibrary(lpFile);
}

DWORD APIENTRY MainThread(LPVOID lpArgs)
{
    HMODULE hKernel32 = NULL;

    do
    {
        hKernel32 = GetModuleHandle("kernel32.dll");
        Sleep(200);
    } while (!hKernel32);

    dwLoadLibrary = (DWORD) GetProcAddress(hKernel32, "LoadLibrary");

    if (dwLoadLibrary != 0) pLoadLibrary = (oLoadLibrary) DetourFunction((PBYTE) dwLoadLibrary, (PBYTE) myLoadLibrary);

    return TRUE;
}

BOOL APIENTRY DllMain(HMODULE hModule, DWORD dwReason, LPVOID lpReserved)
{
    if (dwReason == DLL_PROCESS_ATTACH) CreateThread(NULL, NULL, NULL, &MainThread, NULL, NULL);

    return TRUE;
}