Reading and writing local files

Ruby

#writing to the local file
begin
 file_path = Rho::RhoFile.join(Rho::Application.userFolder, 'filename.txt')
  file = Rho::RhoFile.new(file_path, Rho::RhoFile::OPEN_FOR_WRITE)
  file.write("===========================================\n")
  file.write('Hello from Rhodes!')
ensure
 file.close
end

#reading the whole local file
file_path = Rho::RhoFile.join(Rho::Application.userFolder, 'filename.txt')
file_content_as_string = Rho::RhoFile.read(file_path)

#reading specified number characters from the local file
begin
  file_path = Rho::RhoFile.join(Rho::Application.userFolder, 'filename.txt')
  file = Rho::RhoFile.new(file_path, Rho::RhoFile::OPEN_FOR_READ)
  characters = file.read(150) #read 150 characters from the file
ensure
  file.close
end


A file can be open in the following modes: 

• Rho::RhoFile::OPEN_FOR_APPEND
   Open a file for output at the end of a file. The file is created if it does not exist.
• Rho::RhoFile.OPEN_FOR_READ 
  Open a file for read-only operations. The file must exist.
• Rho::RhoFile.OPEN_FOR_WRITE 
  Create an empty file for output operations. If a file with the same name already exists, its contents are discarded and the file is treated as a new empty file.
• Rho::RhoFile.OPEN_FOR_READ_WRITE 
  Open a file for update (both for read and write). The file must exist.

Pay attention to the app has write permissions only in the user folder. Use Rho::Application.userFolder for getting path to the user folder.