From Xojo Documentation
Creates a file and opens a binary stream for reading and exclusive writing to the passed FolderItem.
The overwrite parameter controls whether the operation can overwrite an existing file. The default is False.
Invoke Create using the syntax for shared methods, i.e. use BinaryStream.Create(...)
If the stream can not be opened as requested, an IOException will be raised. For instance, this will happen if the file is already opened for writing, or if the app (its user) has no permission to modify this file or to create a file in the affected directory.
This code reads each pair of bytes from a file and writes them in reverse order to a new file. The user chooses the source file using the Open-file dialog box and saves the new file using the Save as dialog box.
If inputItem <> Nil Then
Var inputStream As BinaryStream = BinaryStream.Open(f, False)
Var outputItem As FolderItem = FolderItem.ShowSaveFileDialog("","")
If outputItem <> Nil Then
Var outputStream As BinaryStream = BinaryStream.Create(f, True)
outputStream.LittleEndian = Not inputStream.LittleEndian
Do Until inputStream.EndOfFile
If inputStream.Length - inputStream.BytePosition >= 2 Then
Catch exc As IOException
MessageDialog.Show("Oops - failed to create the output file.")
Note: Create should here be called with overwrite=True because GetSaveFolderItem already asks the user for permission to do this (if the user doesn't want to overwrite an existing file, GetSaveFolderItem would return nil).