C#

Bitmap b = new Bitmap(100, 100);
using (Graphics g = Graphics.FromImage(b)){
   g.FillRectangle(Brushes.Red, 10, 10, 20, 20);
}

public struct MY_STRUCT<br />
{<br />
   public int x;<br />
   public int y;<br />
   public System.IntPtr arrNames;<br />
}<br />
<br />
Your calling code looks like this:<br />
<br />
public class MyWrapper<br />
{<br />
    [DllImport("MyDll.dll")]<br />
    private static extern IntPtr GetMyStruct();<br />
<br />
    public static MY_STRUCT GetMyStructW()<br />
    {<br />
        IntPtr p = GetMyStruct();<br />
        IntPtr pArray;<br />
        IntPtr pString;<br />
        string[] strings;<br />
        MY_STRUCT s;<br />
<br />
        s = (MY_STRUCT)Marshal.PtrToStructure(p, typeof(MY_STRUCT));<br />
<br />
        pArray = s.arrayNames;<br />
<br />
        /*Now you can extract each string one by one as follows*/<br />
        pString = Marshal.ReadIntPtr(pArray);<br />
<br />
        while( pString != null )<br />
        {<br />
              strings[i] = Marshal.PtrToStringUni(pString);<br />
              i++;<br />
              pString = Marshal.ReadIntPtr(pArray);<br />
        }<br />
<br />
        return ( s );<br />
        <br />
        <br />
    }<br />
}

<br />
string filename = lboxFiles.Items[x].ToString();<br />
new FileInfo(filename).MoveTo(Path.ChangeExtension(filename,cmbxRenExt.SelectedItem.ToString()));<br />