01001012 Principle of Computer Programming ong txt includeprocess
- Slides: 35
ตวอยางโปรแกรมเปดเทกไฟลทผด 01001012 Principle of Computer Programming กรณทไฟล ong. txt ไมไดอยท //#include<process. h> exit 0; Directory เดยวกบ โปรแกรม #include<stdio. h> #include<conio. h> int main() { FILE *fp; fp = fopen("ong. txt", "r"); if (fp == NULL) { printf("Cannot open filen"); return 0; } else printf("Can open filen"); return 0; } Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ Cannot open file 10 King Mongkut's Institute of Technology
ตวอยางโปรแกรมเปดเทกไฟลทถก 01001012 Principle of Computer Programming #include<stdio. h> #include<conio. h> //#include<process. h> exit 0; int main() { FILE *fp; fp = fopen("C: /Temp/ong. txt", "r"); Can open file if (fp == NULL) { printf("Cannot open filen"); return 0; } else printf("Can open filen"); return 0; } Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 11 King Mongkut's Institute of Technology
รปแบบการปดเทกซไฟล 01001012 Principle of Computer Programming fclose (fp) fp คอ ตวแปรทใชเกบตำแหนงไฟล หากสามารถปดเทกไฟลไดสำเรจจะ กลบ แตหากไมสำเรจจะ return คา EOF Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ return คา 0 12 King Mongkut's Institute of Technology
ตวอยางโปรแกรมเปด - ปดเทกไฟล 01001012 Principle of Computer Programming #include<stdio. h> #include<conio. h> //#include<process. h> exit 0; int main() { FILE *fp; Can open file fp = fopen("C: /Temp/ong. txt", "r"); if (fp == NULL) Close file { printf("Cannot open filen"); getch(); return 0; } printf("Can open filen"); if (!fclose(fp)) printf("n. Close filen"); return 0; } Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 13 King Mongkut's Institute of Technology
โปรแกรมอานขอมลจากเทกไฟล (เขยนเตม ) (2) #include<stdio. h> | 1 ขอความ 01001012 Principle of Computer Programming Can open file #include<conio. h> int main() Close file { FILE *fp; Programming char str[20]; fp = fopen("C: /Temp/ong. txt", "r"); if (fp == NULL) { printf("Cannot open filen"); return 0; } printf("Can open filen"); fscanf(fp, "%s", str); if (!fclose(fp)) printf("n. Close filen"); getch(); printf("%s", str); return 0; } Sittigorn Jirasak http: //www. kmitl. ac. th/~ksjirasa/ 16 King Mongkut's Institute of Technology
โปรแกรมอานขอมลจากเทกไฟล (เขยนยอ ) (3) | 1 ขอความ 01001012 Principle of Computer Programming #include<stdio. h> int main() { FILE *fp; char str[20]; fp = fopen("C: /Temp/ong. txt", "r"); fscanf(fp, "%s", str); fclose(fp); printf("%s", str); return 0; } Programming Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 17 King Mongkut's Institute of Technology
โปรแกรมอานขอมลจากเทกไฟล (เขยนยอ ) (4) | 3 ขอความ 01001012 Principle of Computer Programming #include<stdio. h> int main() { FILE *fp; char str 1[20], str 2[20], str 3[20]; fp = fopen("C: /Temp/ong. txt", "r"); fscanf(fp, "%s %s %s", str 1, str 2, str 3); fclose(fp); printf("%s %s %s", str 1, str 2, str 3); return 0; } Programming 2548 kmitl Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 18 King Mongkut's Institute of Technology
โปรแกรมอานขอมลจากเทกไฟล (เขยนยอ ) (5) | 3 อกขระ 01001012 Principle of Computer Programming #include<stdio. h> int main() { FILE *fp; char ch 1, ch 2, ch 3; fp = fopen("C: /Temp/ong. txt", "r"); fscanf(fp, "%c%c%c", &ch 1, &ch 2, &ch 3); fclose(fp); printf("%c %c %c", ch 1, ch 2, ch 3); return 0; } P r o Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 19 King Mongkut's Institute of Technology
โปรแกรมอานขอมลจากเทกไฟล จำนวนเตม (ยอ ) (6) #include<stdio. h> int main() { FILE *fp; char str 1[20], str 2[20]; | 2 ขอความ 1 01001012 Principle of Computer Programming int num; fp = fopen("C: /Temp/ong. txt", "r"); fscanf(fp, "%s %d %s", str 1, &num, str 2); fclose(fp); printf("%s %s %d", str 1, str 2, num); return 0; } Programming kmitl 2548 Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 20 King Mongkut's Institute of Technology
โปรแกรมรบชอ และอายของคน 3 คนแลว () 01001012 Principle of Computer Programming #include<stdio. h> #include<conio. h> //#include<process. h> exit 0; int main() { FILE *fp; char name[20], ch; int age, count=0; fp = fopen("C: /Temp/new. txt", "w"); if (fp == NULL) { printf("Cannot open filen"); getch(); return 0; } printf("Can open file (write)n"); //continue Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 23 King Mongkut's Institute of Technology
โปรแกรมรบชอ และอายของคน 3 คนแลว () 01001012 Principle of Computer Programming /*input data in program & write on file*/ while(count<3) { printf ("n. Person [%d]n", count+1); printf ("Enter name : "); scanf ("%s", name); printf ("Enter age : "); scanf ("%d", &age); fprintf (fp, "n. Person [%d]n", count+1); fprintf (fp, "Name : %-20 s age : %dn", name, age); count++; } if (!fclose(fp)) printf("n. Close filen"); //continue Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 24 King Mongkut's Institute of Technology
โปรแกรมรบชอ และอายของคน 3 คนแลว () 01001012 Principle of Computer Programming getch(); fp = fopen("C: /Temp/new. txt", "r"); if (fp == NULL) { printf("Cannot open filen"); getch(); return 0; } printf("Can open file (read)n"); ch = getc(fp); while (ch!=EOF) { printf("%c", ch); ch = getc(fp); } if (!fclose(fp)) printf("n. Close filen"); return 0; } Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 25 King Mongkut's Institute of Technology
โปรแกรมเขยน Structure ลงไฟล 01001012 Principle of Computer Programming #include<stdio. h> Name : Kmitl int main() ID : 48010000 { Age : 44_ FILE *fptr; struct student { char name[20]; char ID[9]; int age; } s; fptr = fopen("St. Record. txt", "w"); printf("Name : "); scanf("%s", s. name); //flushall(); printf("ID : "); scanf("%s", s. ID); //flushall(); printf("Age : "); scanf("%d", &s. age); //flushall(); fwrite(&s, sizeof(struct student), 1, fptr); fclose(fptr); return 0; } Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 27 King Mongkut's Institute of Technology
โปรแกรมอาน Structure จากไฟล 01001012 Principle of Computer Programming #include<stdio. h> Name: Kmitl int main() ID: 48010000 and Age: 44 { FILE *fptr; ----------------struct student { char name[20]; char ID[9]; int age; } s; fptr = fopen("St. Record. txt", "r"); if (fptr == (FILE *)NULL) printf("Cannot open filen"); else while (fread(&s, sizeof(struct student), 1, fptr)!=0) { printf("Name: %sn", s. name); printf("ID: %s and Age: %dn", s. ID, s. age); printf("-----------------n"); } fclose(fptr); return Jirasak Sittigorn 0; 29 King Mongkut's Institute of Technology } http: //www. kmitl. ac. th/~ksjirasa/
โปรแกรมการใชคำสง fseek () 01001012 Principle of Computer Programming FILE *fptr; int noffset; struct student { char name[20]; char ID[9]; int age; } s; fptr = fopen("St. Record. txt", "w"); strcpy (s. name, "Student A"); strcpy (s. ID, "48010000"); s. age = 17; fwrite(&s, sizeof(struct student), 1, fptr); strcpy (s. name, "Student B"); strcpy (s. ID, "48012000"); s. age = 18; fwrite(&s, sizeof(struct student), 1, fptr); strcpy (s. name, "Student C"); strcpy (s. ID, "48015000"); s. age = 20; fwrite(&s, sizeof(struct student), 1, fptr); fclose(fptr); Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 31 King Mongkut's Institute of Technology
โปรแกรมการใชคำสง fseek () 01001012 Principle of Computer Programming fptr = fopen("St. Record. txt", "r"); noffset = 0 * sizeof(struct student); if (fseek( fptr, noffset, 0) == 0 ) { if (fread(&s, sizeof(struct student), 1, fptr) != 0) { printf("Name: %sn", s. name); printf("ID: %s and Age: %dn", s. ID, s. age); printf("-----------------n"); } } fclose(fptr); Name: Student A ID: 48010000 and Age: 17 ----------------Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 32 King Mongkut's Institute of Technology
โปรแกรมการใชคำสง fseek () 01001012 Principle of Computer Programming fptr = fopen("St. Record. txt", "r"); noffset = 1 * sizeof(struct student); if (fseek( fptr, noffset, 0) == 0 ) { if (fread(&s, sizeof(struct student), 1, fptr) != 0) { printf("Name: %sn", s. name); printf("ID: %s and Age: %dn", s. ID, s. age); printf("-----------------n"); } } fclose(fptr); Name: Student B ID: 48012000 and Age: 18 ----------------Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 33 King Mongkut's Institute of Technology
โปรแกรมการใชคำสง fseek () 01001012 Principle of Computer Programming fptr = fopen("St. Record. txt", "r"); noffset = 2 * sizeof(struct student); if (fseek( fptr, noffset, 0) == 0 ) { if (fread(&s, sizeof(struct student), 1, fptr) != 0) { printf("Name: %sn", s. name); printf("ID: %s and Age: %dn", s. ID, s. age); printf("-----------------n"); } } fclose(fptr); Name: Student C ID: 48015000 and Age: 20 ----------------Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 34 King Mongkut's Institute of Technology
คำสงการอานขอมลจากไฟล และเขยนขอมลลงไฟล 01001012 Principle of Computer Programming fscanf (fp, "format", &variable); var = getc(fp); fgets(var, length, fp); fprintf (fp, "format", value); putc (ch, fp); fputs (str, fp); fwrite(*ptr, size, items, *stream); Jirasak Sittigorn http: //www. kmitl. ac. th/~ksjirasa/ 35 King Mongkut's Institute of Technology
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