How to convert C# Struct to Byte Array

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Hi, I have structure :

C#

struct StartReadXML
       {
           public int CmdID;//3
           public char[] CmdName;//ReadXML
           public char[] Description;

       };

With initializations as below :
StartReadXML startXML=new StartReadXML();
startXML.CmdID = 3;
var charCmdName = "s".ToCharArray();
startXML.CmdName = "s".ToCharArray();
startXML.Description = "p".ToCharArray();
Now, I want it to be assigned to a byte array. Which am doing using marshalling as below:

C#

int sizestartXML = Marshal.SizeOf(startXML);//Get size of struct data
            byte[] startXML_buf = new byte[sizestartXML];//declare byte array and initialize its size
            IntPtr ptr = Marshal.AllocHGlobal(sizestartXML);//pointer to byte array

            Marshal.StructureToPtr(startXML, ptr, true);
            Marshal.Copy(ptr, startXML_buf, 0, sizestartXML);
            Marshal.FreeHGlobal(ptr);

            //Sending struct data  packet
            stm.Write(startXML_buf, 0, startXML_buf.Length);//Modified

But, it fails at Structuretoptr conversion method. Please help in transferring the struct data as bytes for which am using above steps.
Thanks in advance :) !!

Posted 11-May-15 2:02am

sreedharmaruthi

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_Asif_ · Accepted Answer · 2015-05-11T02:10:00

Solution 1

Check this out.

How to convert a structure to a byte array in C#?[^]

Posted 11-May-15 2:10am

_Asif_

Comments

Sascha Lefèvre 11-May-15 8:31am

Asif, he's already using marshaling and the answer to his specific problem isn't explicitly mentioned on the linked page. I voted 1 but I will revert my vote if you provide him an answer that is more specific.
/Sascha

Sascha Lefèvre 11-May-15 9:45am

Apparently it did help him, so I re-voted 4.

sreedharmaruthi · Accepted Answer · 2015-05-11T03:19:00

Thanks for your help :)!
This one worked for me

[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 100)]

as below:

C#

struct StartReadXML
        {
            public int CmdID;//3
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]
            public string CmdName;//ReadXML
            [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 50)]
            public string Description;//Data to be sent
        };

and

StartReadXML startXML=new StartReadXML();
            startXML.CmdID = 3;
            //var charCmdName = "s".ToCharArray();            
            startXML.CmdName = "Sree";
            startXML.Description = "test";