[Mono-dev] Marshalling (Segmentation fault)

[russell.kay at realtimeworlds.com]

True,... 

In this case I was ripping an example I had that was using a union type
layout, which does need this type of arrangement... Apologies all round.

For simple structures C/C++ is pretty portable these days between
architectures, the main issue is 32bit/64bit and pointers (and any
alignment specific nastiness).

My main gripe with C# is not supporting union in a portable way (i.e.
you have to resort to LayoutKind.Explicit).

Russell


-----Original Message-----
From: mono-devel-list-bounces at lists.ximian.com
[mailto:mono-devel-list-bounces at lists.ximian.com] On Behalf Of Robert
Jordan
Sent: 11 October 2007 13:15
To: mono-devel-list at lists.ximian.com
Subject: Re: [Mono-dev] Marshalling (Segmentation fault)

russell.kay at realtimeworlds.com wrote:
> The C# version of this Structure would be best expressed as
> 
> [StructLayout(LayoutKind.Explicit)]
> unsafe struct FrameGrab
> {
> 	[FieldOffset(0)]
> 	public int bufferlength;
> 	[FieldOffset(4)]
> 	Public fixed IntPtr buffer[1000]
> }

This is usually bad portability-wise. LayoutKind.Sequential with
the system's ABI default packing should be used instead, unless
the struct really has a specific layout.

Robert

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