Converting PMString to std::wstring in InDesign CS6

Question

I'd have to get the filepath of a resource of the opened document to a std::wstring.
I can easily get the filepath of the resource as a PMString:
InterfacePtr< ILinkResource > pResource( GetDataBase( LinkManager ), ResourceUIDRef.GetUID(), UseDefaultIID() );
PMString ResourceFilepath = pResource->GetLongName( false );
The problem is that I'd have to convert the PMString to a std::wstring without losing any of the information. The path may contain special characters like Arabic or Chinese so just converting the string to a std::string with GetPlatformString() won't get the job done.
Should I even grab the PMString or should I just use WideString from GetLongName() and somehow get the conversion done for that? StringUtils has a ConvertWideStringToUTF8 but it also seems to give out std::string.
So to put the long story short: How to correctly convert PMString to std::wstring?
The plug-in will be used in Windows environment.

Answer 1

I ended up using GrabUTF16Buffer() from WideString. This way I never needed to use PMString.
std::wstring wszResourceFilepath( reinterpret_cast< const wchar_t* >( pResource->GetLongName( false ).GrabUTF16Buffer( 0 ) ) );
Though now I managed to run to a completely new problem.
I'm using RelinkResource from LinkFacade and it requires a URI. URI has a constructor that takes a WideString so I presumed it would handle the wide string well. However it seems that if the WideString includes special characters (let's say Chinese) and then it is given for the URI constructor the URI won't work and then relinking will fail.
// A small sample code.
std::wstring wszResourcePath = L"file:" + wszFullpath; // wszFullpath is an std::wstring that has a filepath with special characters.
WideString ResourcePathForURI( wszResourcePath.c_str() );
URI URIResourcePath( ResourcePathForURI );
WideString ReverseFromURI = URIResourcePath.GetURIW();
std::wstring wszCorrect( reinterpret_cast< const wchar_t* >( ResourcePathForURI.GrabUTF16Buffer( 0 ) ) ); // This one has the same string as wszResourcePath on the first line.
std::wstring wszIncorrect( reinterpret_cast< const wchar_t* >( ReverseFromURI.GrabUTF16Buffer( 0 ) ) ); // All this has is L"/"
Am I doing something wrong here constructing the URI this way or should I use a different method for relinking?