C# How to call function from C++ dll

Question

I have the following code that is implemented in a dll file

typedef  signed __int16 TS_ELEMENT;
typedef  TS_ELEMENT *   TS_DATA;
LIBTERAVIEW_API TS_RES tsRead(TS_DATA buffer);

I would like to call this function in my C# program and use it in order to see data that is printed from it. I have read about unmanaged structures and importing functions from DLLs; however, I am not able to figure out the syntax of how to do this in my code. I have generated the following codes based on my readings on this topic:

[DllImport("libteraview.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern void tsStart();

[DllImport("libteraview.dll", CallingConvention = CallingConvention.Cdecl)]
public static extern byte* tsRead(byte* buffer);`

The first one works however, I am not able to get the second method to run and read data as it always gives me an Unhandled Exception error.

I would appreciate any help on how to get this tsRead() function imported from a DLL.

Answer 1

Please check Return type and Parameter type for tsRead() function. It should be int instead byte.