Sensoray 2251 Rev.A - Manual (Page 48)

Appendix A : Importing the DLL in C# .NET
Sensoray provides a C DLL for maximum portability between programming languages. This
allows the use of Sensoray SDKs in Visual Basic, C# .NET, Visual C++ and of course C.
The question of how to send structures (with arrays) to any C dll from C# for instance is fairly
common.
There are also some reference materials available from MSDN for using WIN32 DLL calls in
C#.
C# example for using the function SN_SetOverlayText:
In C#, the following can be defined to use this function:
[StructLayout(LayoutKind.Sequential)]
public struct POINT
{
public int x;
public int x;
};
[StructLayout(LayoutKind.Sequential)]
public struct overlay_text_t{
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 96)]
public string text;
public int fontidx;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 28)]
public string reserved;
};
[DllImport("mid2250.dll")]
static extern int SN_SetOverlayText(int idx, ref POINT position,
ref overlay_text_t text,
bool enable, bool update,
int board);
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