Argox PA-20 Programming Guide - Manual (Page 47)

PT-20 Programming Guide 45
fErrorCode： 1:filename is a NULL string.
2:File specified by filename does not exist.
_rename
Purpose： Change file name of an existing file.
Syntax： int _rename(char *old_filename, char *new_filename);
Example call： if (_rename(“C:\\data\\store.dat”,” C:\\data\\text.dat”)
_put s(“store.dat renamed”);
Includes： #include “SDK.h ”
Description： Change the file name of the file specified by old_filename to
new_filename. But the route does not change.
Returns： If rename successfully changes the file name, it returns an integer
value of 1. In case of error, rename will return an integer value of
0, and an error code is set to the global variable fErrorCode to
indicate the error condition encountered. Possible error codes and
their interpretation are listed below.
fErrorCode： 1:Either old_filename or new_filename is a NULL string.
2:File specified by old_filename does not exist.
3:A file with file name new_filename already exists.
4:File path is error
5:Filename is too long.
6:File is using.
7:Filename is error
8:Other error
tell
Purpose： Get file pointer position of a DAT file.
Syntax： long tell(int fd);
Example call： current_position = tell(fd);
Includes： #include “SDK.h ”
Description： The tell function returns the current file pointer position of the
DAT file whose file handle is specified in the argument fd. The
file pointer position is expressed in number of bytes from the
beginning of file. For instance, if the file pointer points to the
beginning of file, the file pointer position will be 0.
Returns： The long integer value returned by tell is the current file pointer
position in file. In case of error, tell returns a long value of -1 and
an error code is set to the global variable fErrorCode to indicate
the error condition encountered. Possible error codes and their
interpretation are listed below.