Get handle/intptr from memorystream or similar?

[haddaway]

I am using an old windows api which requires a handle when writing output from it. Normally I would use a filestream and it's handle but now I don't want to save a file, I just want to retrieve the content in a string. That why I thought I could use the memorystream - but it has no handle?

How does it work, can I get a handle from a memorystream or do you have any other suggestion of how to get a filestream saving to memory instead of a file?

thanks