Re: why memory leak here?

"Giovanni Dicanio" <>
Tue, 18 Sep 2007 10:57:14 +0200
"Vivienne" <> ha scritto nel messaggio

I am using a c# library in my c++ project, so the function that
convert System::String to basic_string is often called. But when
debugging, I get the memory leak report.

here is the function:

void convert(System::String ^ s, std::string& os ){
using namespace Runtime::InteropServices;
pin_ptr<const wchar_t> wch = PtrToStringChars(s);


I'm not a C++/CLI expert, however, why don't you use
Marshal::StringToHGlobalAnsi for the conversion?


void Convert(
  System::String ^ sIn, // input - managed string
  std::string & sOut // output - unmanaged string
  // Marshal the managed string to unmanaged memory
  char * stringPtr = (char *) Marshal::StringToHGlobalAnsi(
sIn ).ToPointer();

  // Deep-copy to std::string
  sOut = std::string( stringPtr );

  // Free the temporary unmanaged string memory
  Marshal::FreeHGlobal( IntPtr(stringPtr) );


Note that I would very much prefer a conversion to *Unicode* strings, i.e.
use Marshal::StringToHGlobalUni, and use *std::wstring* instead of
(I would use std::string just to store UTF-8 Unicode strings. I would really
consider ANSI strings as some form of computer archaeology :-)


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