DLL injection

//
// DllTest.dll
//
#include <windows.h>
#include <stdio.h>

#define DllExport extern "C" __declspec(dllexport)

void printMsg()
{
    FILE *fptr = NULL;
    errno_t err = fopen_s(&fptr, "skelog.txt", "a+");
    if (!err)
    {
        fprintf(fptr, "Process ID=(%d) loading Dll\n", GetCurrentProcessId());
        fclose(fptr);
    }

}

DllExport BOOL APIENTRY DllMain(HINSTANCE hinstDLL, DWORD fdwReason, LPVOID lpReserved)
{
    switch (fdwReason)
    {
    case DLL_PROCESS_ATTACH:
        // printMsg();
        MessageBox(NULL, TEXT("DLL Injection"), TEXT("Warning"), MB_OK);
        break;
    default:
        break;
    }
    return TRUE;
}

DllExport LRESULT CALLBACK MouseProc(int code, WPARAM wParam, LPARAM lParam)
{
    printMsg();
    return CallNextHookEx(NULL, code, wParam, lParam);
}

//
// Test.exe
//
#include <windows.h>

int main()
{
    DWORD dwProcID = 7164;
    WCHAR argumentBuffer[] = L"D:\\Documents\\Visual Studio 2012\\Projects\\Test\\Debug\\DllTest.dll";

    HANDLE hProc = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcID);
    if (!hProc)
        return -1;

    HMODULE hDll = GetModuleHandle(TEXT("Kernel32"));
    if (!hDll)
        return -1;

    LPTHREAD_START_ROUTINE loadLibraryAddress = (LPTHREAD_START_ROUTINE)GetProcAddress(hDll, "LoadLibraryW");
    if (!loadLibraryAddress)
        return -1;

    LPVOID lpBaseAddress = VirtualAllocEx(hProc, NULL, 256, MEM_COMMIT | MEM_RESERVE, PAGE_READWRITE);
    if (!lpBaseAddress)
        return -1;

    BOOL isValid = WriteProcessMemory(hProc, lpBaseAddress, argumentBuffer, sizeof(argumentBuffer), NULL);
    if (!isValid)
        return -1;

    HANDLE hThread = CreateRemoteThread(hProc, NULL, 0, loadLibraryAddress, lpBaseAddress, 0, NULL);
    if (!hThread)
    {
        DWORD error = GetLastError();
        return -1;
    }

    return 0;
}