Easiest way to pass modifyable System.String as modifyable LPTSTR?

Question

BOOL PathFindOnPath( LPTSTR pszFile, LPCTSTR *ppszOtherDirs );

I am calling this API from managed C++. My pszFile is in a System.String.

What is the easiest way to pass this as LPTSTR? (Considering its an inout parameter)

I have tried pin_ptr and interior_ptr but neither seems to be accepted by the compiler.

Answer 1

You need to marshal across a (pre-allocated) StringBuilder instead of a String reference. For details, see this MSDN article on Marshaling.