Hi All, Im sure this is easy. I'm forgotten to cpp. I need to write cpp wrapper over a dot net c# web service proxy class. I thought I would start with this basic tutorial...LOL already stuck. Overview: I have a Dotnet(c# managed) dll just adding some text to your input string:

public class CSharpClass
{
public static byte[] Hello(byte[] name)
{
string s = ", hello from .NET!";
byte[] helloPart = Encoding.ASCII.GetBytes(s);
byte[] whole =
new byte[name.Length + helloPart.Length];
int i = 0;
foreach (byte b in name)
{
whole[i++] = b;
}
foreach (byte b in helloPart)
{
whole[i++] = b;
}
return whole;
}
}

This get consummed by the CPP dll:

using namespace CSharpAssembly;

__declspec(dllexport) char* __stdcall Hello(char* name)
{
int i = 0;
while (*name != '\0')
{
i++;
name++;
}
array<unsigned char>^ nameManArr = gcnew array<unsigned char>(i);
name -= i;
i = 0;
while (*name != '\0')
{
nameManArr[i] = *name;
name++;
i++;
}
array<unsigned char>^ char8ManArr = CSharpClass::Hello(nameManArr);
char* char8UnmanArr = new char[char8ManArr->Length + 1];
for (int i = 0; i < char8ManArr->Length; i++)
{
char8UnmanArr[i] = char8ManArr[i];
}
char8UnmanArr[char8ManArr->Length] = '\0';
return char8UnmanArr;
}

I have a debug entry test command line app (C#) consuming the C++ dll.

class DebugEntry
{
[DllImport("CppStdcallInerfaceWrapper2.dll",
CharSet = CharSet.Ansi, CallingConvention =
CallingConvention.StdCall)]
public static extern string Hello(string name);

    static void Main(string\[\] args)
    {
        string sd = Hello("MyName");
        System.Console.WriteLine();
        System.Console.ReadLine();
    }
}

When I run the command line app I can debug through the cpp dll into the C# dll but when I return from the cpp dll I get error on returning to the debug commanline app. I get error:

An unhandled exception of type 'System.AccessViolationException' occurred in mscorlib.dll

Additional information: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.

Hi Guys, Mine was a dumbass developer faullt...well... din't realy knew once you create the file the creat method returns a stream :laugh: so yea just changed my line of code abit FileStream stream = fileInfo.Create(); stream.Close() Hope your problem is as simple as this...

Hi, I get the same error. I'm using a FileInfo object with a file name passed to the constructor upon creating the FileInfo object. I check if the file exist and if so I delete it and recreat it. Al works fine first time but when I click on the button again to do the same functionality over again I get same error mentioned. The is NO close method on the FileInfo object nor Dispose. I tried the Refresh() in desprate attemps but still error. Please see a snipplet below: private void button2_Click(object sender, EventArgs e) { FileInfo fileInfo = new FileInfo(label2.Text + ".TMP"); if (fileInfo.Exists) { fileInfo.Delete(); } fileInfo.Create(); int y = 0; }