How to cast const char* to static const char XY[]?

Question

I'm doing some C# code which is using DLLImport to call a function inside my C++ DLL:

[DllImport("my.dll", EntryPoint = "#16", CallingConvention = CallingConvention.StdCall)]
    private static extern void sendstring(string s);

I call it like this in C#:

sendstring("Test1\\0test2\\0");

---

My C++ DLL needs to create a static const char XY[] = "Test1\\0test2\\0"; from this, since I need that for calling another DLLs function from inside my c++ DLL like this:

functiontootherdll(sizeof(s),(void*)s);

So my code in C++:

extern "C" {
void MyClass::sendstring( const char *s) {  
    functiontootherdll(sizeof(s),(void*)s);
 }

---

The problem: It is working, if I define the thing manually inside my C++ DLL like this:

static const char Teststring[] = "Test1\0test2\0";
functiontootherdll(sizeof(Teststring),(void*)Teststring);

but it is not taking the const char *s when calling this from my C# file (it will report different errors from the called other dll). I would need to know how I can cast the const char *s to something like static const char s[] or such.

As you realize I have little clue about all this, so any help is very welcome!

Answer 1

Alright, I found out a way I think:

I modified my C++ to:

extern "C" {
void MyClass::sendstring( const char *s) {
int le = strlen(s);
char p[256];
strcpy(p,s);
char XY[sizeof(p) / sizeof(*p) + 1];
int o=0;
for (int i = 0; i<le;i++) {     
    if (p[i] == ';') {
        XY[i] = '\0';
    } else {
    XY[i] = p[i];
    }
    o++;
}
XY[o] = '\0';
functiontootherdll(sizeof(XY),(void*)XY);
}

Afterwards the function call to

functiontootherdll(sizeof(XY),(void*)XY);

is working fine.

Pls note that I send from my C# code now a string like "Test1;test2;test3;...", trying with the \\\\0 as separator did not work out. My call with C# is:

sendstring("Test1;test2;test3");

I don't know if this is a smart solution, but at least it is one :)