Function VerifyFilename

libraries/lib-wx-init/SelectFile.cpp:45–81

On Windows, wxString::mb_str() can return a NULL pointer if the conversion to multi-byte fails. So, based on direction intent, returns a pointer to an empty string or prompts for a NEW name.

// returns a pointer to an empty string or prompts for a NEW name.
//
char *VerifyFilename(const wxString &s, bool input)
{
   static wxCharBuffer buf;
   wxString name = s;

   if (input) {
      if ((char *) (const char *)name.mb_str() == NULL) {
         name = wxEmptyString;
      }
   }
   else {
      wxFileName ff(name);
      FileExtension ext;
      while ((char *) (const char *)name.mb_str() == NULL) {
         AudacityMessageBox(
            XO(
"The specified filename could not be converted due to Unicode character use."));

         ext = ff.GetExt();
         name = SelectFile(FileNames::Operation::_None,
            XO("Specify New Filename:"),
            wxEmptyString,
            name,
            ext,
            { ext.empty()
               ? FileNames::AllFiles
               : FileNames::FileType{ {}, { ext } }
            },
            wxFD_SAVE | wxRESIZE_BORDER,
            wxGetTopLevelParent(NULL));
      }
   }

   mFilename = name.mb_str();

   return (char *) (const char *) mFilename;
}
#endif