Questions tagged [structlayout]
49 questions
1
vote
1 answer
Difference between [StructLayout(LayoutKind.Sequential)] and TypeAttributes.SequentialLayout?
I dynamically build a struct for P/Invoke using
const TypeAttributes typeAttributes = TypeAttributes.Public |
TypeAttributes.SequentialLayout |
…
Thomas Flinkow
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1
vote
0 answers
FxCop warning won't go away
An object of this class will be passed to an API call. I implemented the first suggestion from the warning below:
To reduce security risk, marshal field 'Resource.k__BackingField'
as Unicode, by setting StructLayout.CharSet on 'Resource'
to…
ajeh
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1
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1 answer
Problems with Marshal.PtrToStructure and String
I've the following class
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 1)]
public class xy11Dataset : SZLDataset
{
public short Index { get; set; }
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 20)]
private…
Jochen Kühner
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1 answer
Does "DefaultCharSetAttribute" apply to "StructLayoutAttribute.CharSet" too?
C# default platform invoke uses ANSI marshalling both for method parameters and struct fields strings.
System.Runtime.InteropServices contains an attribute "DefaultCharset" to change it to Unicode.
From MSDN: "Apply the DefaultCharSetAttribute…
Davide Bergamini
- 13
- 3
1
vote
1 answer
FatalExecutionEngineError when messing with StructLayouts
Im messing arround with structlayouts and I found some thing i find quite odd:
The following code is working as i thought it would:
using System;
using System.Runtime.InteropServices;
public class Program
{
[STAThread]
static void Main()
…
CSharpie
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6 answers
What am I doing wrong with this use of StructLayout( LayoutKind.Explicit ) when calling a PInvoke struct with union?
The following is a complete program. It works fine as long as you don't uncomment the '#define BROKEN' at the top. The break is due to a PInvoke failing to marshal a union correctly. The INPUT_RECORD structure in question has a number of…
csharptest.net
- 62,602
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1
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4 answers
StructLayout to convert byte array to short
Sorry about the horrible title but I honestly have know idea what I want nor what is wrong...
Basically I have a struct (well I have 250+ structs but they all follow the same idea) that looks like this:
[StructLayout(LayoutKind.Explicit)]
public…
jduncanator
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0
votes
2 answers
Marshaling an unmanaged struct containing a char* member
I am working with a callback function going from unmanged code to my managed C# code. The callback has a parameter void* eventData. EventData could be several different struct types. In my C# code I define eventData as an IntPtr and use …
Dan Vogel
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1 answer
Pad a struct so its size is a multiple of 16 bytes
I'm trying to have my C# struct match up some complex padding and packing rules.
Fields should be aligned on 4 byte boundaries.
The entire struct should be a multiple of 16 bytes
Using the StructLayout attribute I can make sure that fields are…
Roy T.
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0 answers
C to C# struct with union byte array Map
typedef union
{
volatile struct
{ //Init
UINT64 ARG1 : 1; //800H
UINT64 ARG2 : 1; //800H
UINT64 ARG3 : 1; //00H
…
REPEATSIT
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- 1
0
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1 answer
nesting arrays of C# classes
I posted a related question a few weeks ago : Marshal.Sizeof() returning unexpected value
As background, we hired a third party to convert an old C++ project to C#. This is a communications protocol application that sends/receives messages over…
buzzard51
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0
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1 answer
C# StructLayout and dispose
I have designed a StructLayout named ReceiveBuffer, and inside ReceiveBuffer, I have an unmanaged type of array to store data. The code is shown as below.
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public struct…
CivilKen
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0
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3 answers
Fixed sbyte[] to string C#
I'm trying to get a string from memory using StrucLayout and FieldOffset
But I'm having a lot of trouble understanding how byte works.
Here is my code ATM :
[StructLayout(LayoutKind.Explicit)]
public unsafe struct InfoDetails
{
…
Cesar
- 453
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0
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1 answer
undefined behaviour with fieldoffset
i have extrated with success a structure object from a valid pointer using the PtrToStructure function (in vb.NET), the problem is the field "FrameRects" has invalid values comparing with the values obtained from a C++ sample:
the vb.NET code is…
abdellah_gogop
- 25
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0
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2 answers
C# StructLayout Pack=?? for use with bool values
In C#, I am creating multiple different structs that contain 16 variables of type bool. I will have several different of these structs that will then be combined with other data types into more complex structs.
I am needing to have them treated as…
bakerjw
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