AMX DESIGN XPRESS V 1.5 - PROGRAMMER GUIDE Betriebsanweisung PDF herunterladen (Seite 279)

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KwikNet Virtual File System

DAK

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kvf_tell kvf_tell

Purpose Determine the Current Position of the File Pointer in a Virtual File

Used by

n Task o ISP o Timer Procedure o Restart Procedure n Exit Procedure

Setup Prototype is in file KN_FILES.H.

#include "KN_LIB.H"

#include "KN_FILES.H"

long kvf_tell(KN_VFILE *vfd;

Description Vfd is a virtual file descriptor identifying a currently open virtual file.

Returns If successful, a value of n is returned where n is the position of the file

pointer within the virtual file. If the file pointer is at the end of the file,

the value n will be the number of bytes in the file.

If parameter vfd does not reference an open virtual file and there is no

underlying file system to handle the request, a value of -1 is returned.

Note If the parameter vfd does not reference a currently open virtual file, the

request is passed on via the KwikNet Universal File System Interface to the

underlying real file system, if one exists. In such a case, the return value

will be dictated by the equivalent ftell() function.

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