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Posted 9 Jun 2004


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How to copy a String into a struct using C#

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10 Jun 2004
How to copy a String into a struct using C#


This article show a simple code snippet using which you can copy a string into a struct.

Using the code

using System;
using System.Runtime.InteropServices;
using System.Text;

class Class1

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Unicode)]
    public struct MyStruct
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=4)] public string fname;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=4)] public string lname;
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst=7)] public string phone;
    public static void Main()
        string buffer = "abcdefgh2223333";
        IntPtr pBuf = Marshal.StringToBSTR(buffer);
        MyStruct ms = (MyStruct)Marshal.PtrToStructure(pBuf,typeof(MyStruct));
        Console.WriteLine("fname is: {0}",ms.fname);
        Console.WriteLine("lname is: {0}",ms.lname);
        Console.WriteLine("phone is: {0}",;


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Comments and Discussions

GeneralMarshalling BSTR * Pin
buratino224-Jun-07 21:48
Memberburatino224-Jun-07 21:48 
GeneralMixed structures Pin
Mancunian21-Apr-06 3:00
MemberMancunian21-Apr-06 3:00 
QuestionIs it possible to create a function of this? Pin
Anonymous7-Apr-05 17:37
MemberAnonymous7-Apr-05 17:37 
AnswerRe: Is it possible to create a function of this? Pin
dgiljr8-Apr-05 4:16
Memberdgiljr8-Apr-05 4:16 
GeneralRe: Is it possible to create a function of this? Pin
Anonymous26-Apr-05 15:08
MemberAnonymous26-Apr-05 15:08 
Generalpointless Pin
leppie10-Jun-04 7:12
Memberleppie10-Jun-04 7:12 
GeneralRe: pointless Pin
dgiljr10-Jun-04 8:35
Memberdgiljr10-Jun-04 8:35 
GeneralRe: pointless Pin
soumyasg28-Oct-06 18:12
Membersoumyasg28-Oct-06 18:12 
GeneralGood, but... Pin
casperOne10-Jun-04 2:15
MembercasperOne10-Jun-04 2:15 
GeneralRe: Good, but... Pin
dgiljr10-Jun-04 4:32
Memberdgiljr10-Jun-04 4:32 
GeneralRe: Good, but... Pin
casperOne10-Jun-04 6:21
MembercasperOne10-Jun-04 6:21 

I think that this is ok, but I don't see why you wouldn't use Serialization, or something else. This is completely dependent on the structure being composed of strings, as well as the strings being embedded in the structure.

I think it is good for a specific use case, but for the general case, it needs some work.
GeneralRe: Good, but... Pin
dgiljr10-Jun-04 8:32
Memberdgiljr10-Jun-04 8:32 
GeneralRe: Good, but... Pin
casperOne10-Jun-04 8:52
MembercasperOne10-Jun-04 8:52 
GeneralRe: Good, but... Pin
Mark Abela10-Jun-04 12:21
MemberMark Abela10-Jun-04 12:21 
GeneralRe: Good, but... Pin
dgiljr11-Jun-04 3:57
Memberdgiljr11-Jun-04 3:57 
GeneralRe: Good, but... Pin
Mark Abela14-Jun-04 11:42
MemberMark Abela14-Jun-04 11:42 
GeneralRe: Good, but... Pin
dgiljr15-Jun-04 3:46
Memberdgiljr15-Jun-04 3:46 

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