Retrieving DLL name, not calling application name - c++

Question

I've written two COM classes in C++, contained in a single MFC DLL. They're being loaded as plugins by a 3rd party application.
How can I get the file name, and version number, of the DLL from within those classes?

Answer 1

The main dll entry gives you the handle of your dll.
extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
and
GetModuleFileName(hInstance, buffer, MAX_PATH);
can be used to get the filename of the dll.
GetFileVersionInfoSize
GetFileVersionInfo
will be used to get the file version.

Answer 2

TCHAR fileName[MAX_PATH + 1];
GetModuleFileName(hInstance, fileName, MAX_PATH);
Where hInstance is the one you get in the DllMain function. Don't use GetModuleHandle(0), because that returns the HINSTANCE of the host application.

Answer 3

CString GetCallingFilename(bool includePath)
{
CString filename;
GetModuleFileName(AfxGetInstanceHandle(), filename.GetBuffer(MAX_PATH), MAX_PATH);
filename.ReleaseBuffer();
if( !includePath )
{
int filenameStart = filename.ReverseFind('\\') + 1;
if( filenameStart > 0 )
{
filename = filename.Mid(filenameStart);
}
}
return filename;
}
CString GetCallingVersionNumber(const CString& filename)
{
DWORD fileHandle, fileVersionInfoSize;
UINT bufferLength;
LPTSTR lpData;
VS_FIXEDFILEINFO *pFileInfo;
fileVersionInfoSize = GetFileVersionInfoSize(filename, &fileHandle);
if( !fileVersionInfoSize )
{
return "";
}
lpData = new TCHAR[fileVersionInfoSize];
if( !lpData )
{
return "";
}
if( !GetFileVersionInfo(filename, fileHandle, fileVersionInfoSize, lpData) )
{
delete [] lpData;
return "";
}
if( VerQueryValue(lpData, "\\", (LPVOID*)&pFileInfo, (PUINT)&bufferLength) )
{
WORD majorVersion = HIWORD(pFileInfo->dwFileVersionMS);
WORD minorVersion = LOWORD(pFileInfo->dwFileVersionMS);
WORD buildNumber = HIWORD(pFileInfo->dwFileVersionLS);
WORD revisionNumber = LOWORD(pFileInfo->dwFileVersionLS);
CString fileVersion;
fileVersion.Format("%d.%d.%d.%d", majorVersion, minorVersion, buildNumber, revisionNumber);
delete [] lpData;
return fileVersion;
}
delete [] lpData;
return "";
}