寫入和讀取txt文件
#include<stdio.h> #include<string.h> int main( int argc, char *argv[] ) { int rc=0; FILE *fp; char c[] = "<html> \r\n \ <head> \r\n \ <title>WEB RESTRICTION</title> \r\n \ </head> \r\n \ <body> \r\n \ <h1>WARRNING</h1> \r\n \ <p>YOU ARE NOT ALLOWED TO ACCESS THIS PAGE !!!</p> \r\n\ </body> \r\n \ </html> \r\n"; char buffer[20]; /* 打開文件用於讀寫 */ fp = fopen("file.txt", "w+"); /* 寫入數據到文件 */ fwrite(c, strlen(c) + 1, 1, fp); /* 查找文件的開頭 */ fseek(fp, 0, SEEK_SET); /* 讀取並顯示數據 */ fread(buffer, strlen(c)+1, 1, fp); printf("%s\n", buffer); fclose(fp); return rc; }
讀取指定的txt文件
#include<stdio.h> #include<string.h> int main( int argc, char *argv[] ) { int rc=0; FILE *fp; char buffer[256]={0}; /* 打開文件用於讀寫 */ fp = fopen("file.txt", "r"); /* 讀取並顯示數據 */ fread(buffer, sizeof(buffer), 1, fp); printf("%s\n", buffer); fclose(fp); return rc; }
讀取一行
#include<stdio.h> #include<string.h> int main( int argc, char *argv[] ) { int rc=0; FILE *fp; char buffer[256]={0}; /* 打開文件用於讀寫 */ fp = fopen("file.txt", "r"); int len; if(fp != NULL){ while(fgets(buffer,256,fp) != NULL) { len = strlen(buffer); buffer[len-1] = '\0'; printf("0 %s\n", buffer); } fclose(fp); } printf("1 %s\n", buffer); return rc; } # gcc -o str.o str.c # ./str.o 0 dddddddddddddddd 0 ddddddddd 0 eeeeeeeeeeee 1 eeeeeeeeeeee