C / C++ / MFC

ofstream fp;

CString someString;
int num = 4;

// Will be File4.txt in this situation
someString.Format("File%d.txt", num);

fp.open(someString, ios::out);

char someString[1000];  // Arbitrary buffer size -
// use something big enought o hold your string.

int num = 4;
sprintf(someString, "File%d.txt", num);

fp.open(someString, ios::out);
...

dwFlags

Reserved.

ullVersion

Value that contains the version information. It is divided into four 16-bit fields containing the major and minor version numbers, the build number, and the QFE version, in that order. Use the MAKEDLLVERULL macro to construct this value.

STDAPI DllGetVersion(DLLVERSIONINFO* pDllInfo)
{
	// DLLVERSIONINFO
	pDllInfo->dwBuildNumber         = BUILD_NUMBER;
	pDllInfo->dwMajorVersion        = MAJOR_NUMBER;
	pDllInfo->dwMinorVersion        = MINOR_NUMBER;
	pDllInfo->dwPlatformID          = PLATFORM_ID;

	if (pDllInfo->cbSize == sizeof(DLLVERSIONINFO2))
	{
		// DLLVERSIONINFO2
		DLLVERSIONINFO2* pDllInfo2 = (DLLVERSIONINFO2*)pDllInfo;
		pDllInfo2->ullVersion = MAKEDLLVERULL(MAJOR_NUMBER,
                                                        MINOR_NUMBER,
							BUILD_NUMBER,
							DLL_SRVPACK);
	}

	return (S_OK);
}