Encoding problem with string

[robUK2]

Hello,

VS 2008 3.5.Net

I am getting a string from a call back in a C++ native DLL which I have written. And for some reason it displays wrong something like this. i.e. [][[[[[[[[[[[[[ or ????????????????? with ASCII encoding.

My code is below. I think the DLL is using unicode, and I am trying to encode it in ASCII. The parameter in call back definition is char*. And in my C# I am using a string.

I have also tried Unicode, UTF-8, and ASCII. All of them display incorrectly.

Am I doing something wrong with my code?

Many thanks for any suggestions,

*.hpp file ==============
typedef int (__stdcall *ptrIncomingCall)(int callID, char *caller);
MOBILEDLL_API int drvIncomingCall(ptrIncomingCall cb);

*.cpp file ==============
int drvIncomingCall(ptrIncomingCall cb)
{
	int callerID = cb(20, "Joe bloggs");

	return callerID;
}

C# code ===============
 private delegate int incomingCallDelegate(int callerID, string caller);
        [DllImport("MobileDLL.dll")]
        static extern int drvIncomingCall(incomingCallDelegate cb);

        int OnIncomingCall(int callerID, string caller)
        {
            this.label1.Text = callerID.ToString();
            this.label2.Text = caller;

            return 1;
        }

        private void button4_Click(object sender, EventArgs e)
        {
            drvIncomingCall((incomingCallDelegate)OnIncomingCall);   
        }

 

[robUK2]

Sorry, in my last post I left out the encoding I was doing.

ASCIIEncoding encoding = new ASCIIEncoding();
byte[] callerBytes = encoding.GetBytes(caller);

this.label1.Text = callerID.ToString();
this.label2.Text = encoding.GetString(callerBytes, 0, callerBytes.Length);

 

[robUK2]

Hello,

I tested on both .Net and CF. In .Net everything works as expected. However, with CF you have to do the following:


byte[] callerBytes = System.Text.UnicodeEncoding.Unicode.GetBytes(caller.ToString());
this.label6.Text = System.Text.Encoding.Default.GetString(callerBytes, 0, callerBytes.Length);

Thanks,