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File Handling

File Handling. Summer 2014 COMP 2130 Intro Computer Systems Computing Science Thompson Rivers University. Your vision? Seek with all your heart?. Unit Learning Objectives. Explain the concept pf data files Explain different types of files. Types of Files. Three categories of files

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File Handling

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  1. File Handling Summer 2014 COMP 2130 Intro Computer Systems Computing Science Thompson Rivers University

  2. Your vision? Seek with all your heart? Unit Learning Objectives • Explain the concept pf data files • Explain different types of files Code Optimization

  3. Types of Files • Three categories of files • Text files • Formatted files • Binary files Introduction

  4. Common Functions • Define a File pointer • FILE *fp • Open a File • Fopen(“filename, “mode” • R, w, a, r+, w+, a+ • Close a File • Fclose(fp) • Perform operations • Fscanf() • fprintf() • Fgetc() • Fputc() Introduction

  5. Create a file #include <stdio.h> main() { FILE *fp; fp= fopen(“test.txt", "w+"); fprintf(fp, "This is testing for fprintf...\n"); fputs("This is testing for fputs...\n", fp); fputc(ch, fp); fclose(fp); } Introduction

  6. Read a file int main () { FILE *fp; int c; fp= fopen("file.txt","r"); while(1) { c = fgetc(fp); if( feof(fp) ) { break ; } printf("%c", c); } fclose(fp); return(0); } Introduction

  7. Merging command line arguments /* fgetsexmaple */ #include <stdio.h> intmain(intarg, char *argv[]) { FILE * pFile; char string [BUFSIZ]; pFile = fopen (argv[1] , "r"); if (pFile == NULL) perror ("Error opening file"); else { while (fgets (string , BUFSIZ, pFile) != NULL) { puts (string); } fclose (pFile); } return 0; } Introduction

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