In C# PInvoke, how do I pass a string buffer so that the C DLL fills it and returns? What will be the PInvoke declaration?
The C function declaration is
int GetData(char* data, int buflength);
In C#, I have declared it as
[DllImport(DllName)]
static extern Int32 GetData([MarshalAs(UnmanagedType.LPStr)]StringBuilder receiveddata, Int32 buflen);
Is it correct? I'm passing the StringBuilder variable like this
int bufferLength = 32;
StringBuilder data = new StringBuilder(bufferLength);
int result = GetData(data, bufferLength);
I would like to know is it correct or not?
Thanks