frustrating parameter issue

  • Thread starter Thread starter Vinz
  • Start date Start date
V

Vinz

Hello everyone,

My question is part C# and part C++. Please don't kill me for bringing C#
inhere :-) Also please don't kill me for asking a n00b question, I'm still
new to C++/CLI and C#.


I have an assembly written in C++/CLI with a public function:

int MyClass::MyFunction(String ^x) {
x = "zzz";
return 0;
};


I want to call this function from a C# app and show the changed contents of
variable

MyClass TheClass = new MyClass();
String w = "m";
TheClass.MyFunction(w);
MessageBox.Show(w);


When executing, the messagebox shows 'm', and I want it to show 'zzz'.

What am I doing wrong here???

Thanks for reading sofar.

Vince.
 
I want to call this function from a C# app and show the changed contents of
variable
Click to expand...

Vince,

You need to define the function parameter as a tracking reference -
see "% Tracking Reference" in MSDN.

Dave
 
Thanks very much guys :-)

I tried to use the % before but that doesn't compile. ^% compiles though. I
had to also use ref x instead of just x in the C# call too btw.

Anyway, I got it working now, thanks a lot :-)

Vince.
 
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