Managed class to unmanaged class

[jjknack]

I have a class that is using a managed object to get information from a database. Specifically OracleClient and DataTables/DataRows. I am able to get the information through this class ok, but I must pass it back to a C application that has an unmanaged C++ interface between the two.

Long story short, I need to convert a managed System::String _gc * to a char * to pass back. Is there a way to do this?

 

[Cagliostro]

you can't mix managed code with unmanaged however you can use them both in the same program. But you can try do declare some function with extern "C", I haven't tried that and don't know if it is possible.

Ion Filipski

 

[jjknack]

Found it:

//using namespace System::Runtime::InteropServices;
System::String * str = S"Hello world\n";
char* str2 = (char*)(void*)Marshal::StringToHGlobalAnsi(str);
printf(str2);
Marshal::FreeHGlobal(str2);


Thanks