Linux學習之嵌入式Linux編程文件IO（C語言版）

一、文件IO常用函數(shù)

1.open

2.write

3.read

示例代碼：

#include <sys/types.h> #include <fcntl.h> #include <unistd.h> #include <string.h> #include <stdlib.h> #include <stdio.h> #include <fcntl.h>typedef struct Student {char _name[20];char _schoolnumber[20]; }Student; int main() {int fd;int rd;int wr_len_name = 0;int wr_len_schoolnumber=0;int sumstr=0;int flag=1;int str1;int str2;int str3;char str_1[]={"My name is:"};char str_2[]={"My schoolnumber is:"};char str_3[]={" "};char str_read[256]; fd = open("Schoolnumber.txt", O_CREAT | O_RDWR|O_APPEND, 0777);if (fd < 0){printf("Open file schoolnumber.txt failuse!\n");return -1;}printf("Open file schoolnumber.txt success!\n");while(flag!=-1&&flag==1){Student* add = (Student*)malloc(sizeof(Student));printf("Please enter your name:\n");scanf("%s", add->_name);printf("Please enter your student number:\n");scanf("%s", add->_schoolnumber);printf("Start write,please wait...\n");strcat(add->_schoolnumber,"\r\n");str1=write(fd,str_1,strlen(str_1));wr_len_name = write(fd, add->_name, strlen(add->_name));str3=write(fd,str_3,strlen(str_3));str2=write(fd,str_2,strlen(str_2));wr_len_schoolnumber = write(fd, add->_schoolnumber, strlen(add->_schoolnumber));printf("Do you want to continue typing?,Enter - 1 to exit, 1 to continue...\n");scanf ("%d",&flag);sumstr+=strlen(str_1)+strlen(str_2)+strlen(str_3)+strlen(add->_name)+strlen(add->_schoolnumber);}if (wr_len_name&&wr_len_schoolnumber){ printf("Write to file schoolnumber.txt success!\n");printf("Wrile length is:[%d]!\n",sumstr);}else{printf ("write to file schoolnumber failure...\n");}close(fd);printf("The contents read from the file are:\n");printf("______________________________________________________________________\n");rd=open("Schoolnumber.txt", O_RDONLY|O_APPEND, 0444);read(rd,str_read,sumstr);for(int i=0;i<sumstr;++i) {printf("%c",str_read[i]); }printf("\n");printf("______________________________________________________________________\n");close(fd); return 0; } 創(chuàng)作挑戰(zhàn)賽新人創(chuàng)作獎勵來咯，堅持創(chuàng)作打卡瓜分現(xiàn)金大獎

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