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//用于拷贝文件
#include <stdio.h>
#include<stdlib.h>
#include <string.h>
int main()
{
FILE *fp_from=NULL; //定义文件指针
FILE *fp_to=NULL;
int len; //获取文件长度
char *ch=NULL; //缓存buffer
if ((fp_from=fopen("from.txt","w+"))==NULL) //打开源文件,注意这句话中的括号,“==”的右边要用括号括起来
{
printf("open from file error!\n");
exit(0);
}
else
{
printf("open from file successfully! prepare to write...\n");
}
fwrite("hello",1,strlen("hello"),fp_from); //将一个字符串写入源文件中
printf("write successfully!\n\n");
fflush(fp_from); //刷新文件
if ((fp_to=fopen("to.txt","w+"))==NULL) //打开目标文件
{
printf("open write file error!");
exit(0);
}
else
{
printf("open write file successfully!\n");
}
len=ftell(fp_from); //获取源文件长度
ch=(char *)malloc(sizeof(char *)*(len)); //动态分配数组长度
memset(ch,0,len); //清零,否则无法将内容写入!!!
rewind(fp_from); //将源文件指针复位到开头,否则写入为空!
fread(ch,1,len,fp_from); //将源文件内容写到buffer中
fwrite(ch,1,len,fp_to); //将buffer中的内容写回到目标文件中
printf("copy successfully!\n");
fclose(fp_from); //关闭文件
fclose(fp_to);
return 0;
}
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原文地址:http://www.cnblogs.com/weekman/p/4321327.html