Marshaling an array inside a Struct with methods using C# P/Invoke

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Hi there,
I wrote in C a struct like that

C++


struct IMAGE {
    unsigned int    x, y;
    unsigned char   **data;
};

Could anybody please tell me how to marshall this struct to use in C#?

my solution does not work.

C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class IMAGE
{
            public UInt32 x;
            public UInt32 y;

            public byte[][] data;
};

Posted 31-May-12 16:52pm

Duc Huy Nguyen

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Oleksandr Kulchytskyi · Answer 1 · 2012-06-03T22:09:00

Hi, change declaration of struct to follow:

C#

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)]
public class IMAGE
{
            public UInt32 x;
            public UInt32 y;

            public IntPtr data;
};

and for IntPtr to string use methods:

C#

public static string[] PtrToStringArray (IntPtr stringArray)
         {
            if (stringArray == IntPtr.Zero)
              return new string[]{};

            int argc = CountStrings (stringArray);
            return PtrToStringArray (argc, stringArray);
         }