Passing C++ const char* (String from JAVA) to C#

[eldadno1]

I'm actually a Java programmer, and I'm messing with JNI a bit,

so I've managed to pass an int from java to c++ and to c# and back.
no problems cause it gets serialized automatically.

but when dealing with string - the object JNI passes is jstring which
casts to char* but how to pass it to c#?

Do I need to Marshal it on the c# side??? can someone post a bit of
code example????

my C++ code is like so :

...
JNIEXPORT jint JNICALL Java_jni_ExecuteString_executeString (JNIEnv *env, jobject, jstring strinput) {
       ExecuteStringC* myObj = new ExecuteStringC();
        const char *str;
    int result;
    str = env->GetStringUTFChars(strinput, 0);
        result = myObj->callExecuteString(str);
    env->ReleaseStringUTFChars(strinput, str);  
    return result;

The ExecuteStringC class :

public __gc class ExecuteStringC
{
public:
    CSharpExecuteString __gc *execObj; 
    ExecuteStringC() {
        execObj = new CSharpExecuteString();
    }
    int callExecuteString(const char* str) {
        return execObj->executeString(str); 
      }
};

and finally the C# part :

  class CSharpExecuteString
    {
        public int executeString(string  stringToExec)
        {
            Console.WriteLine("C# Says : " + stringToExec);
            return 0;
        }
    }

Since I'm executing this code from Java it fails but I can't tell where, is it in the first or 2nd classes (C++) ??? or maybe in the C# side.
I do believe it's the lather, but if anyone can shed some info on the subject (posting some code will be nice...)


10x in advance to all contributors :)

[weaknessforcats]

There are a lot of C++/C# interoperabilit y topics in MSDN complete with examples. Microsoft calls this Managed C++.