LINUX 下，编程自学一：文件操作

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opendir.c

#include<stdio.h>#include<unistd.h>#include<sys/types.h>#include<sys/stat.h>#include<dirent.h>int main(){DIR *dir;struct dirent *ptr;struct statfilestat;dir = opendir("file");chdir("file");while((ptr = readdir(dir)) != NULL ){if(strcmp(ptr->d_name,".") == 0 || strcmp(ptr->d_name,"..") == 0)continue;stat(ptr->d_name,&filestat);printf("file name :%s\t size :%d\n",ptr->d_name,filestat.st_size);}return 0;}

stat.c(文件状态)

#include<stdio.h>#include<sys/stat.h>#include<unistd.h>int main(){struct stat buf;stat("stat.c",&buf);printf("size = %d\n",buf.st_size);return 0;}

filefd.c(open,lseek等就用)

#include<stdio.h>#include<sys/types.h>#include<stdio.h>#include<unistd.h>#include<sys/stat.h>#include<fcntl.h>int main(){char buf[] = "This is test file";int fd ;fd = open("testfile",O_CREAT|O_RDWR);perror("open");write(fd,buf,sizeof(buf));perror("write");lseek(fd,100,SEEK_SET);perror("lseek");close(fd);sleep(1);printf("\n");fd = open("testfile",O_RDWR);perror("open");char buf_1[128];read(fd,buf_1,128);printf("buf_1 = %s\n",buf);close(fd);return 0;}

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