Why doesn't it inject a certain function?

Question

C++ / C#

#include "stdafx.h"
#include <Windows.h>
#include "MinHook.h"
#include "Xul\nspr.h"
#include <fstream>

#if defined _M_X64
#pragma comment(lib, "libMinHook.x64.lib")
#elif defined _M_IX86
#pragma comment(lib, "libMinHook.x86.lib")
#endif

typedef int (WINAPI *PR_WRITE)(PRFileDesc *fd, void * buf, PRInt32 amount);

PR_WRITE fpPR_WRITE = NULL;

int WINAPI fPR_WRITE(PRFileDesc *fd, void * buf, PRInt32 amount)
{
  std::ofstream output("D:\\Data.txt", std::ios::out || std::ios::app);
  output << buf << "\n";
  return fpPR_WRITE(fd, buf, amount);
}

BOOL APIENTRY DllMain(HMODULE hModule,
  DWORD  ul_reason_for_call,
  LPVOID lpReserved
  )
{
  MessageBox(NULL, L"All Right", L"All Right", MB_OK);
  switch (ul_reason_for_call)
  {
  case DLL_PROCESS_ATTACH:
  {
    if (MH_Initialize() != MH_OK)
    {
      return 1;
    }
    if (MH_CreateHook(&PR_Write, &fPR_WRITE,
      reinterpret_cast<void**>(&fpPR_WRITE)) != MH_OK)
    {
      return 1;
    }
    if (MH_EnableHook(&PR_Write) != MH_OK)
    {
      return 1;
    }
    break;
  }
  case DLL_THREAD_ATTACH:
    break;
  case DLL_THREAD_DETACH:
    break;
  case DLL_PROCESS_DETACH:
  {
    if (MH_DisableHook(&PR_Write) != MH_OK)
    {
      return 1;
    }
    if (MH_Uninitialize() != MH_OK)
    {
      return 1;
    }
    break;
  }
  }
  return TRUE;
}

If instead of PR_Write, for example, MessageBox, then everything is injected, and if not, then it is not even included in DllMain.

Answer 1

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