STL problem? or dll issue??? 1

[drdad5727]

I wrote a DLL that does this:

__declspec( dllexport ) wstring * myFunction();
wstring * myFunction () {
  wstring result;
  // add stuff into result
  return new wstring(result);
}

which I call like this, from another dll:

wstring * mem = myFunction();
// do stuff to mem
delete mem; // CRASH

The line that says CRASH does just that (it throws a debug assertion failure about the heap pointer being invalid). So, what's going on? Does the copy constructor for wstring not copy the string? Should I do something to the wstring before I delete it?

 

[cpjust]

You should never pass or return complex data types to/from a function in a different module:
Chapter 60. Avoid allocating and deallocating memory in different modules
Chapter 63. Use sufficiently portable types in a module's interface