How do I properly return a char * from an Unmanaged DLL to C#?

Question

Function signature:

char * errMessage(int err);

My code:

[DllImport(\"api.dll\")]       
internal static extern char[] errMessage(int err);         


        

Answer 1

try this:

[DllImport("api.dll")]
[return : MarshalAs(UnmanagedType.LPStr)]
internal static extern string errMessage(int err);
...
string message = errMessage(err);

I believe C# is smart enough to handle the pointer and return you a string.

Edit: Added the MarshalAs attribute