Set a stream to global memory

[aewarnick]

What is the best was to set a stream to global memory but have the flexibility to use the same kind of stream to read from a file?

I tried this:

filebuf fb;
fb.setbuf((char*)pBuffer, ::GlobalSize(hGlbl));
istream* s(fb);
this->FromStream(s);

But I cannot access setbuf. And I don't want to use IStream. I cannot compile it and I didn't see any MS reference to the lib it is defined in.

[aewarnick]

I guess what I need is some kind of memory stream to be able to set a pointer to the data and then set the size of the data within the stream like I tried above.

[aewarnick]

What would be perfect I think is a strstream but it is depreciated!

[CornedBee]

stringstream still exists. You only need to create a std::string from the memory:

std::istringstream stream(std::string(pBuffer, pBuffer+GlobalSize(hGlbl)));

Mind you, this COPIES the memory. You could also allocate the string with a custom allocator type that refers only to this memory block. The problem with that lies in the way allocators are handled, as they effectively can't have state.

[aewarnick]

How would I create a string and set it to that memory block and what is the problem with not having state?

[CornedBee]

The first is very hard without the second. That should answer both questions, if you read up on what allocators do.