std::string to System::String conversion

[piul]

Hi, I have

System::String ^ St = gcnew System::String("Hey ho!");
//...
std::string str("standard");

St = str; //This line won't work, but it's what I'd like to achieve

The only way I can make it work is by doing gcnew again St = gcnew System::String(str.c_str()); but I'm guessing this is not the right way. All the examples I have found tell how to do this when creating a new instance of System::String but none how to do it with an existing one.

[Lost User]

System::String() has no constructor that accepts a std::string Try this:

St = str->c_str();

I must get a clever new signature for 2011.

[piul]

Tried it, no good. error C2664: 'void System::Windows::Forms::Control::Text::set(System::String ^)' : cannot convert parameter 1 from 'const char *' to 'System::String ^'

[Lost User]

Sorry, I guess there is no simple way to do this other than :

St = gcnew System::String(str.c_str());

I must get a clever new signature for 2011.

[piul]

Fair enough. That's what I'd done, but... am I not re-allocating memory without freeing it first?? (I have to do it for a dozen of strings!)

[Lost User]

piul wrote:

am I not re-allocating memory without freeing it first?

It depends on the actual structure of your code. I think a more pertinent question would be: why are you using both std::string and System::String when you only really need one of them, probably the latter. For example code such as:

std::string str("Some string");
System::String ^ st = gcnew(str.c_str());

serves no real purpose, in that the std::string is totally redundant.

I must get a clever new signature for 2011.

[anti AS]

what about

St = gcnew String(str);

or

using namespace System::Runtime::InteropServices;
...
...
St = Marshal::PtrToStringAnsi((IntPtr)str);