CODEWITHSUNDEEP
c#c++visual-c++
Cipher
Cipher

Reputation: 6082

Encoding from C++ to C#

I am sending a series of char arrays from C++ to my C# program.

The c++ functions look something like this:

ReturnChar.cpp

extern "C" RETURNCHAR_API char* testString()
{
    return test;
}

ReturnChar.h

extern "C" RETURNCHAR_API char* __cdecl testString();

ReturnChar Import C#

public static class ImportTest
    {
        [DllImport("ReturnChar.dll", EntryPoint = "testString", CallingConvention = CallingConvention.Cdecl)]
        public static unsafe extern char* testString();
    }
    public partial class MainWindow : Window
    {
        public unsafe MainWindow()
        {
            InitializeComponent();
            try
            {

                StringBuilder sb = new StringBuilder(new string(ImportTest.testString()));
                textBox1.Text = sb.ToString();
            }
            catch(Exception ex)
            {
                MessageBox.Show(ex.Message);
            }
        }
    }

I get the result actually, but looks like there is a problem of encoding between C++ and C#. How can I resolve this?

I don't intend to use wchar_t in my C++ program, because I have the operations being done on char arrays. Can I somehow encode this in C#?

Upvotes: 0

Views: 173

Answers (1)

Mahmoud Al-Qudsi
Mahmoud Al-Qudsi

Reputation: 29539

You should be using wchar_t throughout in your C++ program, and perform your operations on wchar_t arrays instead.

That said, you need to add CharSet = CharSet.Ansi to the DllImport parameters.

Upvotes: 1

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