Managed C++/CLI

	LPCTSTR lpFilename = static_cast<LPCTSTR>(Marshal::StringToHGlobalAnsi(filename).ToPointer());

// Do stuff with lpFilename

	Marshal::FreeHGlobal(static_cast<IntPtr>(const_cast<void*>(static_cast<const void*>(lpFilename))));

const Byte *bp = reinterpret_cast<const Byte*>(filename);

// Find pointer to start of actual char data
if(bp != 0)
{
    unsigned int offset = RuntimeHelpers::OffsetToStringData;
    bp += offset;
}

// Cast to Char pointer
const Char* cFilename = reinterpret_cast<const Char*>(bp);

// Marshal to unmanaged char array
char* bitmapFilename = static_cast<char*>(Marshal::StringToHGlobalAnsi(cFilename).ToPointer());

  // Do stuff with bitmapFilename

Marshal::FreeHGlobal(bitmapFilename);