Marshaling basic(i think) question

[Shurikn]

I never used marshaling before, but I did some c++ code and I wanted its equivalence in c#. My code used a struct like this:

struct EnteteWave
{
	char chunkID [4];
	int chunkSize;
	char format [4];
	char subchunk1ID [4];
	int subchunk1Size;
	short audioFormat;
	short numChannels;
	int sampleRate;
	int byteRate;
	short blockAlign;
	short bitsPerSample;
	char subchunk2ID [4];
	int subchunk2Size;
};

but in c# we cant fix the array in a declaration on struct. So i searched on these forum and fond how to use marshaling and did this:

	[StructLayout(LayoutKind.Sequential)]
	public struct EnteteAvi
	{
		[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
		public byte[] chunkId;
		public Int32 fileSize;
		[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
		public byte[] fileType;
		[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
		public byte[] subChunk1ID;
		public Int32 subChunk1Size;
		[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
		public byte[] subChunk1Type;
		public Int32 cb;
		public Int32 MicroSecPerFrame;
		public Int32 MaxBytePerSec;
		public Int32 PaddingGranularity;
		public Int32 Flags;
		public Int32 TotalFrames;
		public Int32 InitialFrames;
		public Int32 Streams;
		public Int32 SuggestedBufferSize;
		public Int32 Width;
		public Int32 Height;
		[MarshalAs(UnmanagedType.ByValArray, SizeConst=4)]
		public Int32[] Reserved;
	}

(its not the same thing because my c++ code was to acess a wave ane the c# code is acessing an AVI file)

I find this Marshaling thing very confused but I think im using it right. the problem is, my compilator does not like it at all....

C:\Documents and Settings\Nicolas Dufour\Mes documents\Visual Studio Projects\ZoneMedia\AVI.cs(30): The type or namespace name StructLayout could not be found (are you missing a using directive or an assembly reference?)

Maybe im just missing a namespace or using call,m anybody can help?

and while youre looking at my code, does it actually look right?

 

[PlausiblyDamp]

Try adding a

using System.Runtime.InteropServices;

to the top of the file.

 

[Shurikn]

Thank! its what was missing. now i just have to make that code work... ^^