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Linux文件操作函数open close read write等示例

//fileopen.c


#include<stdio.h>


#include<string.h>


#include<sys/types.h>


#include<sys/stat.h>


#include<fcntl.h>


#include<unistd.h>


int main()


{


‍ char temp[]=”hello,abc!”;


int fd;


char pathname[255];


if((fd=open(“fileopen.txt”,O_WRONLY|O_CREAT,0640))==-1)


{


printf(“creat file wrong!”);


}


int len=strlen(temp)+1;


write(fd,temp,len);//若fd为0,或这里直接写0,则会输出到屏幕上而不写入文件中


close(fd);


}


 


//fileopen2.c



#include<sys/types.h>


#include<sys/stat.h>


#include<unistd.h>


#include<fcntl.h>


#include <stdio.h>


int main()


{


int fa;


int s=12;


int len;


char text[20]=”hello,fileopen2!!!”;


fa=open(“fileopen2.txt”,O_WRONLY|O_CREAT,0640);


        //len = sprintf(text, “%d”, s);


write(fa,text,sizeof(text));


close(fa);


}


 


//test_system_fprintf_fopen.c



#include<stdio.h>


#include<stdlib.h>


int main()


{


FILE *stream;


char temp[255];


char *a=”hello,c!”;


stream=fopen(“fprintf.txt”,”w”);


fprintf(stream,”%s\n”,a);


fprintf(stream,”sb,c++\n”);


sprintf(temp,”nl fprintf.txt”);


fclose(stream);


printf(“%s\n”,temp);


system(temp);//system函数参数可以为字符串指针或直接字符串


system(“nl fprintf.txt”);


exit(0);


return 0;


}


 


 


 


//file-rw.c



#include<stdio.h>


#include<fcntl.h>


#include<unistd.h>


int main()


{


int fdr,fdw;


char temp[255];


char filepath[255];


char fileto[255];


printf(“please input the filepath:”);


scanf(“%s”,filepath);


if((fdr=open(filepath,O_RDONLY))==-1)


{


printf(“file not found,open failed!”);


return -1;


}


else


{


                int r_size=read(fdr,temp,255);


close(fdr);


sprintf(fileto,”file-rw.txt”);


if((fdw=open(fileto,O_WRONLY|O_CREAT,0640))==-1)


{


printf(“open failed!”);


return -1;


}


else


{


int w_size=write(fdw,temp,r_size);//相当于复制了所输入文件.txt中的255个大小的字符串到新文件file-rw.txt中


close(fdw);


printf(“have successfully copied 255 chars from \”%s\” to \”%s\”\n”,filepath,fileto);


}


}


return 0;


}

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