Marshal Unmanaged struct to managed code using c#

Question

Hi experts,

I need to process the bytes[] when i get from external application. The external application is also done in c# and they send the bytes thru UDP. They are sending the bytes converted from struct which is stated below :

---

public struct DISPATCH_MESSAGE
{
    [MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)]
    public char[] federation_name; // Units: nil     Range: nil
}

---

So, when i get the bytes, i need to take out the char[] inside that, and get the string out of that char[].

I hope my explanation is clear. i am new to this kind of unmanaged coding. Please help me on this. Its urgent. Thanks.

Answer 1

Probably you should declare it as ByValTStr (depending on the nature of the string, it might be different):

 [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
 public struct DISPATCH_MESSAGE{ 
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 16)]   
    public string federation_name; 
 }

UPDATE: If it's already giving out a char[], it's probably doing the necessary conversion (includes handling encoding) correctly, so I think you'd just need:

string str = new string(instance.federation_name);