Access a C++ struct in C#

Question

I am having a VC++ stucture like

struct VideoInputV20 {
   int m_nBrightness;
   int m_nSharpness;
   int m_nSaturation;
   int m_nContrast;
   int m_nInputState;
   CString m_sObjref;
};

Here in C# I'll receive this stucture in byte[]. Here I need to convert byte[] to stuct.

How can I achive this? Please provide sample code, if possible.

I have no idea what you are asking... can you rephrase this? — Sailing Judo
– Sailing Judo, Commented Nov 6, 2009 at 12:39

ParmesanCodice · Accepted Answer · 2009-11-06 12:50:38Z

4

Declare your struct in C#:

[StructLayout(LayoutKind.Sequential, Pack = 2, CharSet = CharSet.Ansi)]  
struct VideoInputV20
{
    int m_nBrightness;
    int m_nSharpness;
    int m_nSaturation;
    int m_nContrast;
    int m_nInputState;
    [MarshalAs(UnmanagedType.LPWStr)]
    string m_sObjref;
}

Then the code to get it out of a byte[]

GCHandle handle = new GCHandle();
try
{
    // Pin the byte[]
    handle = GCHandle.Alloc(yourByteArray, GCHandleType.Pinned);
    IntPtr ptr = handle.AddrOfPinnedObject();

    // Marshal byte[] into struct instance
    VideoInputV20 myVideoInputV20 = (VideoInputV20 )Marshal.PtrToStructure(ptr, typeof(VideoInputV20 ));
}
// Clean up memory
finally
{
    if (handle.IsAllocated) handle.Free();
}

answered Nov 6, 2009 at 12:50

ParmesanCodice

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2 Comments

RV. Over a year ago

what is GCHandle how i declare in .net2003

ParmesanCodice Over a year ago

You need to add the System.Runtime.InteropServices namespace, it should then be available. It is part of the .NET framework 1.1

Peter Mortensen · Accepted Answer · 2009-11-16 13:20:47Z

1

Badly. Ints are relatively easy to recover, but that CString's object serialization is platform and compiler dependent. Try converting this in C++ to some other representation.

edited Nov 16, 2009 at 13:20

Peter Mortensen

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answered Nov 6, 2009 at 12:39

nothrow

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Comments

Tror · Accepted Answer · 2009-11-06 12:44:24Z

0


byte[] data = GetData();
int structSize = Marshal.SizeOf(VideoInputV20);

if(structSize <= data.Length)
{
   IntPtr buffer = Marshal.AllocHGlobal(structSize);
   Marshal.Copy(data, 0, buffer, structSize);
   VideoInputV20 vi = (VideoInputV20)Marshal.PtrToStructure(buffer, VideoInputV20);
   Marshal.FreeHGlobal( buffer );
}

answered Nov 6, 2009 at 12:44

Tror

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