Linux下的檔案程式設計例子

1、寫入數字

#include #include #include #include #include #include #include #define buffer_size 1024

#define file_path "./file.txt"
/** 程式入口
* */
int main(int argc,char **argv)
/*寫入乙個數字*/
ret = write(test_fd, &buffer, sizeof(int));
if( ret < 0)
printf("write %d byte(s) data\n",ret);
/*將檔案指標移到最開始處去讀檔案中寫入的數字*/
lseek(test_fd, 0l, seek_set);
ret= read(test_fd, &num, sizeof(int));
if(ret==-1)
printf("read %d byte(s) data，the number is %d\n", ret, num);
close(test_fd); 
exit(0); 
}

#include #include #include #include #include #include #include #define file_path "./file.txt"

typedef struct file_record
file_record;
int main()
file_record.index = fd;
file_record.file_size = buf.st_size;
file_record.timep = timep;
/*寫入乙個結構體*/
ret = write(fd, &file_record, sizeof(file_record));
if( ret < 0)
printf("write %d byte(s) data\n",ret);
memset(&file_record, 0, sizeof(file_record));
/*將檔案指標移到最開始處去讀檔案中寫入的結構體*/
lseek(fd, 0l, seek_set);
ret= read(fd, &file_record, sizeof(file_record));
if(ret==-1)
printf("read %d byte(s) data，the time is %s\n", ret, ctime(&(file_record.timep)));
close(fd); 
exit(0); 
}

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