There are a lot of articles about some specific problem using DllImport. Alas quite often I see different replies to the same question. For instance some say if a c++ function returns a a char* and an int* strLen, then some people say I should use a StringBuilder in my dllImport statement and others say return byte[], some have a marshall statement in the dllImport, some don't. Some answers seem needed because of old C# / .net versions.
So the question is: If the dll call from c++ is fairly straightforward, without strange calling conventions, or other strange items, what should the corresponding DllImport functions be if you have output char* and size or input char * and size?
c++ .h
bool SendString(const char* pSendStr, long strSize);
bool ReadString(char* pReadStr, long& readStrSize);
What are the corresponding DllImports? replace the instr and outstr with string? stringbuilder? char[]? byte[]? Is any marshal statement needed?
const char*
==string
andchar*
==StringBuilder
(normally) – leppie