[Mono-bugs] [Bug 77960][Nor] New - Marshalling of fixed size char arrays in structs is unicode only

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Changed by r.gerosa at gmail.com.

http://bugzilla.ximian.com/show_bug.cgi?id=77960

--- shadow/77960	2006-03-30 05:57:08.000000000 -0500
+++ shadow/77960.tmp.19081	2006-03-30 05:57:08.000000000 -0500
@@ -0,0 +1,79 @@
+Bug#: 77960
+Product: Mono: Runtime
+Version: 1.1
+OS: 
+OS Details: Arch Linux 7.1
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: interop
+AssignedTo: mono-bugs at ximian.com                            
+ReportedBy: r.gerosa at gmail.com               
+QAContact: mono-bugs at ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: Marshalling of fixed size char arrays in structs is unicode only
+
+Description of Problem:
+When specifying the [StructLayout(CharSet=CharSet.Ansi)] in a struct
+and using Marshal.PtrToStructure to get the structure from a buffer,
+if there is a fixed size char array in the struct, it is
+marshaled as unicode chars (2 bytes), it should instead read 
+ansi chars (1 byte)
+
+
+Steps to reproduce the problem:
+1. Define a struct decorated with
+[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Ansi)]
+and containing a fixed sixe char array: 
+[MarshalAs (UnmanagedType.ByValArray, SizeConst=4)]
+public char[] test;   
+2. Unmarshal the struct from a buffer, using Marshal.PtrToStructure
+3. The result is wrong
+
+here is an example of c# code reproducing the problem:
+
+using System;
+using System.Runtime.InteropServices;
+
+namespace test
+{
+    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
+    public struct TestStruct1 {
+        [MarshalAs (UnmanagedType.ByValArray, SizeConst=4)]
+        public char[] test;    
+    }
+        
+    class MainClass
+    {
+        public static void Main(string[] args)
+        {
+            GCHandle handle;
+            byte[] buffer = new byte[4]
+{(byte)'t',(byte)'e',(byte)'s',(byte)'t'};
+            int structSize = Marshal.SizeOf(typeof(TestStruct1));
+            Console.WriteLine("struct size: " + structSize);
+            handle = GCHandle.Alloc(buffer, GCHandleType.Pinned);
+            TestStruct1 testStruct1 = (TestStruct1) Marshal.PtrToStructure(
+                handle.AddrOfPinnedObject(),typeof(TestStruct1));
+            handle.Free();
+            Console.WriteLine("value: " + new String(testStruct1.test));
+        }
+    }
+}
+
+Actual Results:
+struct size: 8
+value: ??
+
+Expected Results:
+struct size: 4
+value: test
+
+How often does this happen? 
+always
+
+Additional Information:
+the expected result is the one returned using .NET