gFileAppendTo(object, flags = "G_FILE_CREATE_NONE", cancellable = NULL, .errwarn = TRUE)objectGFile.flagsGFileCreateFlags.cancellableGCancellable object, NULL to ignore.GFileOutputStream] a GFileOutputStream, or NULL on error.errorGError, or NULLG_FILE_CREATE_PRIVATE in flags the file
will be made readable only to the current user, to the level that
is supported on the target filesystem.
If cancellable is not NULL, then the operation can be cancelled by
triggering the cancellable object from another thread. If the operation
was cancelled, the error G_IO_ERROR_CANCELLED will be returned.
Some file systems don't allow all file names, and may
return an G_IO_ERROR_INVALID_FILENAME error.
If the file is a directory the G_IO_ERROR_IS_DIRECTORY error will be
returned. Other errors are possible too, and depend on what kind of
filesystem the file is on.