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2003.09.21 04:36 "[Tiff] (no subject)", by Ryan Yeow
2003.09.21 04:46 "[Tiff] (no subject)", by Pushkar Pradhan
2003.09.22 07:01 "[Tiff] (no subject)", by Rob van den Tillaart

2003.09.22 07:01 "[Tiff] (no subject)", by Rob van den Tillaart

Hi Ryan,

Just started with C# myself, so not an expert opinion. (except for an exercise at a course no experience with this topic)

It is possible to use libraries written in C/C++ from C#. In dotnet vocabulary it is called "unmanaged code".

To use unmanaged code you must use a statement like this:

[DllImport("msvcrt.dll", CharSet=CharSet.Ansi)]
public static extern int puts(String s);

static void Main()
{
    String message = "just some message";
    puts(message);
}

Often you will also need the "MarshallAs" attribute. This attribute can be used with a field in a class or struct, or with a parameter of a method or to handle the returnvalue.

>From the win32API: struct example

        public struct PAINTSTRUCT
       {
               public HDC hdc;
         public int fErase;
              public RECT rcPaint;
            public int fRestore;
            public int fIncUpdate;
          [MarshalAs(UnmanagedType.ByValArray, SizeConst=32)] public byte rgbReserved;
    }

With these 2 terms "DllImport" and "MarshallAs" you must be able to find all relevant details in the manual.

reagrds,
rob tillaart