free memory not clears the memory block

Question

I am using DllImport to call method in c wrapper library from my own .net class. This method in c dll creates a string variable and returns the pointer of the string.

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Answer 1

Although memory is allocated by the DLL in the same heap as your application, it MAY be using a different memory manager, depending on the library it was linked with. You need to either make sure you're using the same exact library, or add code to release the memory that the DLL allocates, in the DLL code itself.