Argox PA-20 Programming Guide Instrukcja Użytkownika Pobierz pdf (Strona 41)

PT-20 Programming Guide

fErrorCode：

2:File specified by fd does not exist.

8:File not opened

10:No more free file space for file extension.

Purpose：

Close a DAT file.

Syntax：

int close(int fd);

Example call：

If (close(fd)) _puts(“file closed!\n”);

Includes：

#include “SDK.h ”

Description：

Close a previously opened or created DAT file whose file handle

is fd.

Returns：

close returns an integer value of 1 to indicate success. In case of

error, close returns 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：

2:File specified by fd does not exist.

8:File not opened

delete_top

Purpose：

Remove a specified number of bytes from top (beginning-of-file

position) of a DAT file.

Syntax：

int delete_top(int fd, int count);

Example call：

delete_top(fd,100);

Includes：

#include “SDK.h ”

Description：

The delete_top function removes the number of bytes specified in

the argument count from a DAT file whose file handle is fd.

Removing of data starts at the beginning-of-file position of the

file. The file pointer position is adjusted accordingly by the

operation. For instance, if initially the file pointer points to the

tenth character, after removing 8 character from the file, the new

file pointer will points to the second character of the file.

The delete_top function will resize the file size automatically.

Returns：

The delete_top function returns the number of bytes actually

removed from the file. In case of error, delete_top returns an

integer 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.

fErrorCode：

2:File specified by fd does not exist.

8:File not opened

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