TFileStream = class(THandleStream)
class PASCALIMPLEMENTATION TFileStream : public THandleStream
TFileStream enables applications to read from and write to a file on disk.
Use TFileStream to access the information in disk files. TFileStream will open a named file and provide methods to read from or write to it. If an application already has a handle to the file, opened in the appropriate mode, use THandleStream instead.