Global memory (GlobalAlloc, etc...)
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Hello, is the memory allocated by the GlobalAlloc function really global? Can different processes access the same memory block allocated by GlobalAlloc? Thanks -Dominik
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Hello, is the memory allocated by the GlobalAlloc function really global? Can different processes access the same memory block allocated by GlobalAlloc? Thanks -Dominik
No. Memory allocated by GlobalAlloc is not visible to other process. If you want to share memory across process, i sugest that you use memory mapped files. Also, MSDN state that GlobalAlloc is not the preferred way to allocate memory. Try the heap memory function instead (HeapAlloc, HeapFree, ect,ect).
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No. Memory allocated by GlobalAlloc is not visible to other process. If you want to share memory across process, i sugest that you use memory mapped files. Also, MSDN state that GlobalAlloc is not the preferred way to allocate memory. Try the heap memory function instead (HeapAlloc, HeapFree, ect,ect).
Ok, I will use memory mapped files. Thank you! -Dominik
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Ok, I will use memory mapped files. Thank you! -Dominik
When you call
::CreateFileMappingwith(HANDLE) LongToHandle(-1)as the first parameter, PAGE_READWRITE as the protection and a name, which is how other applications will access it by callingOpenFileMapping. If the creator will be in one set of permissions (like a service logged in as an administrator) and the other application will have lower permissions, you'll need to create and use SECURITY_ATTRIBUTES (you can create a NULL security attribute which essentially grants global rights to the memory.)