67 lines
1.9 KiB
C
67 lines
1.9 KiB
C
/****************************************************************
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题目：
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实现文件的拷贝，将一个有数据的文件拷贝它的数据到另一个空白的文件里面。
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*****************************************************************
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先在/home/xk/目录下创建一个origin.txt文件和一个copy.txt文件
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然后在origin.txt文件中写入一些数据
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*****************************************************************/
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#include<stdio.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <fcntl.h>
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#include <unistd.h>
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#include <string.h>
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int main()
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{
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int open_status;
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int read_status;
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int write_status;
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int close_status;
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char buf[256] = {0};
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//1、打开源文件
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open_status = open("/home/xk/origin.txt", O_RDWR);
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if(open_status == -1)
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printf("打开源文件失败\n");
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else
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printf("打开源文件成功\n");
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//2、拷贝源文件数据
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read_status = read(open_status, buf, sizeof(buf) - 1);
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if(read_status > 0)
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printf("已复制源文件内容为:%s", buf);
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else
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return -1;
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//3、关闭源文件
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close_status = close(open_status);
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if(close_status == 0)
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printf("关闭源文件成功\n\n");
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else
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printf("关闭源文件失败\n\n");
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//4、打开目标文件
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open_status = open("/home/xk/copy.txt", O_RDWR);
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if(open_status == -1)
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printf("打开目标文件失败\n");
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else
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printf("打开目标文件成功\n");
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//5、写入数据到目标文件
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write_status = write(open_status, buf, strlen(buf));
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if(write_status > 0)
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printf("复制成功，有%d个字符\n", write_status);
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else
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return -1;
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//6、关闭目标文件
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close_status = close(open_status);
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if(close_status == 0)
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printf("关闭目标文件成功\n");
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else
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printf("关闭目标文件失败\n");
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return 0;
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} |