ISaGRAF. Version 3.4

         

FM_WRITE


Àðãóìåíòû:

ID                                               INT íîìåð ôàéëà: âîçâðàùåííûé ôóíêöèåé F_ROPEN

IN                                               MSG              ñîîáùåíèå, êîòîðîå íàäî çàïèñàòü â ôàéë

ok                                              BOO              ñòàòóñ âûïîëíåíèÿ

                                                                        TRUE åñëè óñïåøíî

Îïèñàíèå:

Çàïèñûâàåò ñòðîêîâûå ïåðåìåííûå â äâîè÷íûé ôàéë. Äîëæíà èñïîëüçîâàòüñÿ ñ F_WOPEN è F_CLOSE.  Ýòà ôóíêöèÿ îñóùåñòâëÿåò ïîñëåäîâàòåëüíûé äîñòóï ê ôàéëó, íà÷èíàÿ ñ ïðåäûäóùåé ïîçèöèè. Ïåðâûé âûçîâ ïîñëå F_WOPEN çàïèñûâàåò ïåðâóþ ñòðîêó ôàéëà, êàæäûé âûçîâ ñäâèãàåò óêàçàòåëü çàïèñè.  Ýòà ôóíêöèÿ íå âêëþ÷åíà â ñèìóëÿòîð ISaGRAF.

(*FBD ïðîãðàììà, èñïîëüçóþùàÿ áëîêè óïðàâëåíèÿ ôàéëîì*)

(* ST Ýêâèâàëåíò: *)

file_id := F_WOPEN('trace.txt');

ok := FM_WRITE(file_id,'First message');

ok := FM_WRITE(file_id,'Last message');

ok := F_CLOSE(file_id);

(* IL Ýêâèâàëåíò: *)

                         LD              'trace.txt'

                         F_WOPEN

                         ST              file_id

                         FM_WRITE  'First message'          (*ïèñàòü ïåðâîå ñîîáùåíèå *)

                         ST              ok

                         LD              file_id

                         FM_WRITE  'Last message'          (* ïèñàòü âòîðîå ñîîáùåíèå *)

                         ST              ok

                         LD              file_id

                         F_CLOSE

                         ST              ok



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