File version

[Paul]

Hi,

Does anyone know how to check a version of a file in C++? Any WIN32 API
that does this?

Please advice, thanks!
-P

[Jochen Kalmbach [MVP]]

Re: File version

Hi Paul!
[color=blue]
> Does anyone know how to check a version of a file in C++? Any WIN32 API
> that does this?[/color]

Here is susch a function:

<code>
// Returns
// - a negative value if an error occured (more information can be
retrived by calling "GetLastErr or")
// - "0" if the version is the same
// - "1" if the file-version is lower than the provided version
// - "2" if the file-version is higher than the provided version
int CompareFileVers ion(LPCTSTR szFileName, WORD v1, WORD v2, WORD v3,
WORD v4)
{
LPVOID vData = NULL;
VS_FIXEDFILEINF O *fInfo = NULL;
DWORD dwHandle;
ULONGLONG ullVersion;
ullVersion = v4;
ullVersion |= (((ULONGLONG) v3) << 16);
ullVersion |= (((ULONGLONG) v2) << 32);
ullVersion |= (((ULONGLONG) v1) << 48);

DWORD dwSize = GetFileVersionI nfoSize(szFileN ame, &dwHandle);
if (dwSize <= 0)
return -1;

// try to allocate memory
ULONGLONG fileVersion = 0;
vData = malloc(dwSize);
if (vData == NULL)
{
SetLastError(ER ROR_OUTOFMEMORY );
return -1;
}

// try to the the version-data
if (GetFileVersion Info(szFileName , dwHandle, dwSize, vData) == 0)
{
DWORD gle = GetLastError();
free(vData);
SetLastError(gl e);
return -1;
}

// try to query the root-version-info
UINT len;
if (VerQueryValue( vData, _T("\\"), (LPVOID*) &fInfo, &len) == 0)
{
DWORD gle = GetLastError();
free(vData);
SetLastError(gl e);
return -1;
}

// build the file-version
fileVersion = ((ULONGLONG)fIn fo->dwFileVersionL S) +
((ULONGLONG)fIn fo->dwFileVersionM S << 32);

free(vData);

// compare if the installed version is newer than this hotfix
if (fileVersion > ullVersion)
{
// The file is newer than the provided version
return 2;
}
else if (fileVersion < ullVersion)
{
// The file is older than the provided version
return 1;
}
return 0;
}


int _tmain()
{
CompareFileVers ion(_T("c:\\DOT NETFX_v11.EXE") , 1, 1, 4322, 572);
}
</code>


--
Greetings
Jochen

My blog about Win32 and .NET

http://blog.kalmbachnet.de/