Specifies text file to be opened for append mode

open filename for Append [encoding encoding_type] [lock lock_type] as [#]filenum

file name to open for append
indicates encoding type for the file
locking to be used while the file is open
unused file number to associate with the open file

A file mode used with Open to open a text file for writing.

This mode is used to add text to an existing file with Print #, or comma separated values with Write#.

Text files can't be simultaneously read and written in FreeBASIC, so if both functions are required on the same file, it must be opened twice.

filename must be a string expression resulting in a legal file name in the target OS, without wildcards. The file will be sought for in the present directory, unless the filename contains a path . If the file does not exist, it is created. The pointer is set after the last character of the file.

Encoding_type indicates the Unicode Encoding of the file, so characters are correctly read. If omitted, "ascii" encoding is defaulted. Only little endian character encodings are supported at the moment.
  • "utf8"
  • "utf16"
  • "utf32"
  • "ascii" (the default)

Lock_type indicates the way the file is locked for other processes, it is one of:
  • Read - the file can be opened simultaneously by other processes, but not for reading
  • Write - the file can be opened simultaneously by other processes, but not for writing
  • Read Write - the file cannot be opened simultaneously by other processes (the default)

filenum Is a valid FreeBASIC file number (in the range 1..255) not being used for any other file presently open. The file number identifies the file for the rest of file operations. A free file number can be found using the Freefile function.

Dim i As Integer
For i = 1 To 10
    Open "test.txt" For Append As #1
    Print #1, "extending test.txt"
    Close #1

Differences from QB:
See also:
Back to File I/O Functions
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