Argox PA-20 Programming Guide Manuel d'utilisateur télécharger pdf (Page 42)

PT-20 Programming Guide

9:The value of count is negative.

10:No more free file space for file extension.

delete_topln

Purpose：

Remove a null terminated character string from the top

(beginning-of-file position) of a DAT file.

Syntax：

int delete_topln(int fd);

Example call：

delete_topln (fd);

Includes：

#include “SDK.h ”

Description：

The delete_topln function removes a line terminated by a null

character file until a null character (\0) or end-of-file is

encountered. The null character is also removed from the file.

Removing of data starts at the top (beginning-of-file position) of

the file, and the file pointer position is adjusted accordingly. The

delete_topln function will resize the file size automatically.

Returns：

The delete_topln function returns the number of bytes actually

removed from the file (includes the null character). In case of

error, delete_topln 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 are listed below.

fErrorCode：

2:File specified by fd does not exist.

8:File not opened

9:The value of count is negative.

10:No more free file space for file extension.

eof

Purpose：

Check if file pointer of a DAT file reaches end of file.

Syntax：

int eof(int fd);

Example call：

if (eof(fd)) _puts(“end of file reached!\n”);

Includes：

#include “SDK.h ”

Description：

The eof function checks if the file pointer of the DAT file whose

file handle is specified in the argument fd, points to end-of-file.

Returns：

The eof function returns an integer value of 1 to indicate an

end-of-file and a 0 when not. In case of error, eof returns an

integer value of -1 and an error code is set to the global variable

fErrorCode to indicate the error condition encountered.

fErrorCode：

2:File specified by DBF_fd does not exist.

8:File not opened

filelength

1 2 ... 37 38 39 40 41 42 43 44 45 46 47 ... 129 130

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Argox PA-20 Programming Guide Manuel d'utilisateur Page 42

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