Getting the version number of a *.dll

[ConvertFromOldNGs]

by Jens Richnow >> Wed, 10 May 2000 0:15:50 GMT

I need to determine teh version number of a *.dll we are using in a project. I had a look in the SDK platform and at some samples written in C++ and VFoxPro. However ... no matter how often I start from a
different angle I'm always stuck at the point when it comes to define pointers and types. In the end I would like to use the DllGetVersion callback function imlemented in most dll's.

Does anybody has experiences with determining the version numbers of dll's and could give some advice?

Cheers,

Jens

[ConvertFromOldNGs]

by Krull >> Wed, 10 May 2000 1:17:50 GMT

Hi Jens,

Are you trying to do this directly in JADE using external function calls or are you planning on providing a wrapper function? The problem with calling DllGetVersion from an arbitrary dll directly from JADE is that it is a 3) step process.

1) hinst = LoadLibrary(modulename)
2) <function pointer> = GetProcAddress(hinst, "DllGetVersion")
3) call <function pointer>

Now, allthough you can do steps 1 and 2 in JADE, step 3 will be be somewhat tricky.

One way to do this is to provide a C/C++ wrapper function that returns the version as a string, an integer or an integer for each field, then call the wrapper from JADE. If its of any use to you, I can provide a sample C++ class that looks for DLL version info in 3 possible places in order of: 1) DllGetVersion
2) Fixed File version info
3) String File version Info

This looks in 3 places because only newer DLLs export a DllGetVersion entry-point (all JADE DLLs do when they are built correctly) and other 3rd party DLLs have String version info but not fixed version info.