Argox PA-20 Programming Guide Instrukcja Użytkownika Pobierz pdf (Strona 43)

PT-20 Programming Guide

Purpose：

Get file length information of a DAT file.

Syntax：

long filelength(int fd);

Example call：

datasize = filelength(fd);

Includes：

#include “SDK.h ”

Description：

The filelength function returns the size in number of bytes of the

DAT file whose file handle is specified in the argument fd.

Returns：

The long integer value returned by filelength is the size of the

DAT file in number of bytes. In case of error, filelength 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.

fErrorCode：

2:File specified by fd does not exist.

8:File not opened

filelist

Purpose：

Get file directory information.

Syntax：

int filelist(char * file_list);

Example call：

total_file = filelist(file_list);

Includes：

#include “SDK.h ”

Description：

The filelist function copies the file name, file type, and file size

information (separated by a blank character) of all files in

existence into a character array specified in the argument dir.

When char * file_list = NULL，it will pass the length that the file

string needs back.

For example, if there are two files in “C:\Data”, the filename are

StoreIn.dat and StoreOut, and their filesize are 100bytes and 150bytes,

the data in the return buffer is “C:\Data\StoreIn.dat dat 100

C:\Data\StoreOut.dat dat 150”

Returns：

When “char*file_list” is NULL, it will pass the size of memory

back.

When “char*file_list” is not NULL, it will pass the quantity of file

back.

fErrorCode：

None

lseek

Purpose：

Move file pointer of a DAT file to a new position.

Syntax：

long lseek(int fd, long offset, int origin);

Example call：

lseek (fd, 512, 0);

Includes：

#include “SDK.h ”

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