struct medium_entry
{
    unsigned int                struct_size;

    char                        *medium;
    char                        *description;
    int                         allows_accounts;
    int                         allows_connections;

    ttkCallback                 callback;
    void                        *data;

    unsigned char               *png_image_32;
    unsigned int                png_image_32_len;
    unsigned char               *png_image_16;
    unsigned int                png_image_16_len;
};

    [StructLayoutAttribute( LayoutKind.Sequential )]
    public class medium_entry
    {
        /// unsigned int
        public uint struct_size;

        /// char*
        [MarshalAsAttribute( UnmanagedType.LPStr )]
        public string medium;

        /// char*
        [MarshalAsAttribute( UnmanagedType.LPStr )]
        public string description;

        /// ttkCallback
        public ttkCallback callback;

        /// void*
        public System.IntPtr data;

        /// unsigned char*
        [MarshalAsAttribute( UnmanagedType.LPStr )]
        public string png_image_32;

        /// unsigned int
        public uint png_image_32_len;

        /// unsigned char*
        [MarshalAsAttribute( UnmanagedType.LPStr )]
        public string png_image_16;

        /// unsigned int
        public uint png_image_16_len;

        public medium_entry_t()
        {
            this.struct_size = (uint)Marshal.SizeOf( typeof( medium_entry ) );
        }
    }

            //broken
            System.Reflection.Assembly thisExe;
            thisExe = System.Reflection.Assembly.GetExecutingAssembly();
            //string[] resources = thisExe.GetManifestResourceNames();
            System.IO.Stream fs = thisExe.GetManifestResourceStream( "Plugin.Resources.online_16x16.png" );
            System.IO.BinaryReader br = new System.IO.BinaryReader( fs );
            MediumEntry.png_image_16 = Encoding.ASCII.GetString( br.ReadBytes( (int)fs.Length ) );
            MediumEntry.png_image_16_len = (uint)MediumEntry.png_image_16.Length;

/// int
public bool allows_accounts;
/// int
public bool allows_connections;

 HRSRC ImageRes;
 data *medium_entry; // the structure given by the app
 HMODULE hInstance; // the handle of your DLL instance, passed in through DLLMain

 ImageRes = FindResource(hInstance, MakeIntResource(102), 'PNG');
 data->png_image_32 = LockResource(LoadResource(hInstance, ImageRes));
 data->png_image_32_len = SizeOfResource(hInstance, ImageRes);

Bitmap bmp = null;
System.IO.Stream imgStream = thisExe.GetManifestResourceStream( "Plugin.Resources.online_16x16.png" );

bmp = Bitmap.FromStream( imgStream ) as Bitmap;
if ( !( null == bmp ) )
{
    Rectangle rect = new Rectangle( 0, 0, bmp.Width, bmp.Height );
    BitmapData bmpData = bmp.LockBits( rect, ImageLockMode.ReadOnly, bmp.PixelFormat );
    MediumEntry.png_image_16 = bmpData.Scan0;
    MediumEntry.png_image_16_len = (uint)imgStream.Length;

    // Unlock the bits.
    bmp.UnlockBits( bmpData );
}