Лекц №11

Ôàéëòàé àæèëëàõ
Ôàéë íýýõ
Ôàéëààñ óíøèõ Read (“a.dat,…”)
Ôàéëä áè÷èõ
Ôàéë õààõ

Íýýõ óíøèõ áè÷èõ ¿éë àæèëëàãààíä àøèãëàãäàõ áóôåð
 Èäýâõòýé áàéðëàë
 Àëäààíû íºõöºë áàéäàë òºëºâ
Ôàéëûí àòòðèáóòóóäûã àâñíààð õºíãºâ÷èëæ ºãäºã.Ñè õýëýíä file-òàé àæèëëàõ 2,3 àðãà áàéäàã.
 string(óðñãàë) File
Ôàéë íýýõ ñòàíäàðò ôóíêö áàéäàã. Fopen
Æèøýý íü :
f=fopen(“example.dat”,rwt);-ôàéë íýýñýí


Ãîðèì:




FILE-á¿òýö òºðºë
Ôàéë á¿òöýýñ óíøèõ æèøýý:
include
FILE*f; char s[100];
main()
{ f=open (“noname.c”,”rt+”);
fscanf(f,”%s”,s);
printf(“\n BUFFER:%s\n\n”, f buffer);
printf(“”\n POSITION: %s\n\n”,f curp);
fclose(f);
}
buffer- 1 õýìæýýñò ìàññèâ
curp-èäýâõòýéãýýð õààíààñ óíøèõ
Ôàéëûã ÿìàð ãîðèìä íýýõ âý ?
#include
“___ ”
r-óíøèõààð
w-õýðýâ óã òîäîðõîéëñîí íýðòýé ôàéë áàéõã¿é áîë ¿¿ñãýíý. Áàéâàë áè÷ãýýð íýýõ áîëîâ÷ ôàéëûí äîòîðõ àãóóëãûã óñòãàíà. Øèíýýð ¿¿ñãýíý.
a-add ôàéëûí òºãñãºëä áè÷èëò õèéõýýð íýýõ
+- ôàéëä óíøèõ , áè÷èëò õèéõýýð õàíäàõ
r+-ôàéëä çàñâàð õèéõýýð íýýõ , óíøèíà áè÷èíý
w+-óíøèæ áè÷èõýýð øèíý ôàéë íýýõ
b-ôàéëûã 2-òûí ãîðèìä íýýõ (binary)
t-ôàéëûã text ãîðèìä íýýõ
text , binary ãîðèì 2-ûí ÿëãàà íü 0D,0A-ð ÿëãààòàé.
Text ãîðèìä áè÷âýë 0D,0A-ã òàâèõàä 2 ìºð
Binary ãîðèìä áè÷âýë 0D,0A-ã òàâèõàä 1 ìºð äîîøëîíî.
rt+
wr+ øèíý text ãîðèì ¿¿ñãýõ.
Ôàéëûã íýýõ ¿éëäýë õèéõýýð çààâàë àëäàà øàëãàíà.
Æèøýý :
File *f;
f=fopen(“noname.c”,”rt+”);
if(f==Null)
{ printf(“Ôàéë íýýõýä àëäàà ãàðàâ \n”);
exit (1);}
null-òóõàéí îáüåêòûã ÿìàð ÷ þì çààãààã¿é .Àëäààã áàñ ººð ç¿éëä øàëãàäàã. Åðºíõèé øàëãàõ
File *f;
f=fopen(“noname.c”,”rt+”);
{ if(ferror(f))
}
Íýýõýä :
Óðüä÷èëààä íýýãäñýí ôàéëóóä áàéäàã.
-stdin ñòàíäàðò îðîëòûí òºõººðºìæ
-stdout ãàðàëòûí òºõººðºìæ
-stderr àëäààíû òºõººðºìæ
-stdaux ãàäíààñ õîëáîãäîæ áàéãàà íýìýëò ç¿éë
-stdprn ïðèíòåð
fprintf(stdout “Äýëãýöýíä õýâëýâ”);
fprintf(stdprn ””Ïðèíòåðò õýâëýâ”);
Ôàéë õààõ :
fclose(f);
Ôàéëààñ óíøèõ 5 ôóíêö áàéäàã.
-fscanf ôîðìàòëàñàí ºãºãäºë óíøèõ
-fread øóóä ôàéëààñ òîäîðõîé n byte óíøèíà. Îëîí ºãºãäºë.
-fgets òýìäýãò ìºð
-fgetchar
-fgetc ôàéëààñ íýã òýìäýãò óíøèíà.
Æèøýý íü:
FILE *f;
Char s[100]; int mm, dd,yy; int A[20];
main( )
{
f=fopen(“mydoc.txt”,”rt+”);
fscanf(f,”%s”,s);
fscanf(f,”%d / %d/ %d”,&mm,&dd,&yy);
fread(A,sizeof(int),20,f);
fclose(f);
}
Ôàéëä áè÷èõ :
-fprintf
-fwrite
-fputs
-fputchar
-fputc
fwrite-í æèøýý:
File *f; int A[200];
main( )
{ f=fopen(“mydoc.txt”,”rt+”);
if(fwrite(A,sizeof(int),200,f )==200)
printf(“Àìæèëòòàé áè÷èâ”);
else printf(“Áè÷èõýä àëäàà ãàðàâ”);
fclose(f); }
Ôàéëûí çààã÷
Óíøèõ áè÷èõ ¿éëäýë õèéõýä ôàéëûí çààã÷èéã òîäîðõîéëäîã. Õýäýí byte óíøèæ áè÷ñýí õýìæýýãýýð øèëæäýã.
fopen ãýâýë õàìãèéí ýõýíä øèëæèíý.
Óíøèõäàà ôàéëûí çààã÷èéí áàéðëàëûã øàëãàõ õýðýãòýé.
Feof-ôóíêö
Æèøýý íü :
f=fopen (“mydoc.txt”,”rt+”);
while()