I am having trouble marshalling data between a C# application and an existing C++ DLL. The caveats that are making this difficult are that it is an unsigned char pointer to an array, and I need access to the data (from all fields) after the call in C#. I would like to avoid using unsafe code, if at all possible.
Here is the C++ signature:
BYTE GetData(unsigned char *Data_Type, unsigned char *Data_Content, unsigned int *Data_Length);
I've tried a bunch of things in C#, but here's what I have now:
[DllImport("somecpp.dll")] public static extern byte GetData([In][Out] ref byte Data_Type, [In][Out] ref byte Data_Content, [In][Out] ref int Data_Length);
Then calling it, I am attempting this:
byte retrievedData = GetData(ref data_type, ref data_content, ref data_length);
This is definitely not working, and I'm not sure what to try next. Any ideas? Thanks!