[Mono-bugs] [Bug 77230][Nor] Changed - Marshalling C unions not working anymore

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Changed by maurits.rijk at philips.com.

http://bugzilla.ximian.com/show_bug.cgi?id=77230

--- shadow/77230	2006-01-13 03:43:47.000000000 -0500
+++ shadow/77230.tmp.4785	2006-01-17 16:28:02.000000000 -0500
@@ -77,6 +77,54 @@
 The union I'm trying to marshall is more complicated than the part
 I've shown above. Robert: I will use your code as starting point and
 try to come up with a minimal example that doesn't work anymore.
 
 My actual code has to marshal an array of structs, where each of this
 struct contains a more complicated version of the union shown above.
+
+------- Additional Comments From maurits.rijk at philips.com  2006-01-17 16:28 -------
+A bit more info (still no working testcase): the code fails in a call to  
+
+Marshal.PtrToStructure(paramPtr, typeof(GimpParam));
+
+where paramPtr is an IntPtr and GimpParam is defined as:
+
+  [StructLayout(LayoutKind.Sequential)]
+    public struct GimpParam
+    {
+      public PDBArgType type;
+      public ParamData  data;
+    };
+
+PDBArgtype is an enum, while ParamData is defined as:
+
+  [StructLayout(LayoutKind.Explicit)]
+    public struct ParamData
+    {
+      [FieldOffset(0)]
+      public Int32	d_int32;
+      [FieldOffset(0)]
+      public Int16	d_int16;
+      [FieldOffset(0)]
+      public byte	d_int8;
+      [FieldOffset(0)]
+      public double 	d_float;
+      [FieldOffset(0)]
+      public IntPtr	d_string;
+      [FieldOffset(0)]
+      public GimpRGB  	d_color;
+      [FieldOffset(0)]
+      public Int32    	d_image;
+      [FieldOffset(0)]
+      public Int32    	d_drawable;
+      [FieldOffset(0)]
+      public PDBStatusType	d_status;
+    };
+
+and
+
+  [StructLayout(LayoutKind.Sequential)]
+    public struct GimpRGB
+    {
+      public double r, g, b, a;
+    }
+