marshaling and unmarshaling

Question

0.00/5 (No votes)

See more:

hi ,

i am new to csharp how to marshal the c structures into c sharp.

any body send the document of examples

C#

public byte[] StructureToByte(object objStructure, int iLength)
        {
            byte[] destination = new byte[iLength];
            IntPtr ptr = Marshal.AllocHGlobal(iLength);
            Marshal.StructureToPtr(objStructure, ptr, true);
            Marshal.Copy(ptr, destination, 0, iLength);
            Marshal.FreeHGlobal(ptr);
            return destination;
        }

what is the purpose of StructureToByte convertion.

have a nice day.

regards
Naga

Posted 28-Jul-11 19:36pm

nagaraju

Add a Solution

5 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Olivier Levrey · Answer 1 · 2011-07-28T22:26:00

There are lots of articles and tutorials on internet about marshaling. for example this one:
http://www.c-sharpcorner.com/UploadFile/GemingLeader/617/[^]

Marshaling is the process of translating managed memory into native memory (or native memory to managed memory) so that .NET applications can exchange data with native applications.

Your function StructureToByte converts a managed structure into a byte array. This byte array can then be sent to a native DLL for example. You can send the managed structure directly to the native DLL because it resides in managed memory (not accessible from native code).

nagaraju · Answer 2 · 2011-07-30T08:00:00

hi thanks for your reply.

i have need to write the structure and i wrote the sample , if it is write or wrong please check it.

Requirement:

Messagetype long(4)
MessageTag Long(4)
Tcode Char(7)
Password unsignedcahr(16)
Reserved char

Solution of Structure:

[StructLayout(LayoutKind.Sequential, Pack = 1 )]
public struct sample
{

[MarshalAs(UnmanagedType.U4)]
public uint MessageType;
[MarshalAs(UnmanagedType.U4)]
public uint MessageTag;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 7)]
public string Code;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]
public string sPassword;
[MarshalAs(UnmanagedType.I1)]
public char cReserved;
}

My doubt is it correct or instead of
[MarshalAs(UnmanagedType.U4)]
public uint MessageType;
[MarshalAs(UnmanagedType.U4)]
public ulong MessageType;

please send your feed back .

thanks
naga

Mohammad A Rahman · Answer 3 · 2011-07-30T13:15:00

Solution 3

Another article related to the question,

Mastering structs in C#/[^]

:)

Posted 30-Jul-11 13:15pm

Mohammad A Rahman

nagaraju · Answer 4 · 2011-07-31T19:27:00

Solution 4

thanks for your reply i have some doubts where to ask

thanks
Naga

Posted 31-Jul-11 19:27pm

nagaraju

Asish Limbu · Answer 5 · 2011-07-31T19:32:00

Solution 5

MSDN ARTICLE[^]Gives you a clear Idea about Marshaling and Unmarshaling.

Posted 31-Jul-11 19:32pm

Asish Limbu