C/C++流和文件
我有以下代码：
int checkCorrectness(int i,char *iStr)
{
if(atoi(iStr) == i)
return 1;
return 0;
}
void foo(int i)
{
printf("inside foo %d\n",i);
}
void print()
{
char mystring[100];
freopen("myfile.txt","w+",stdout);
for(int i =0;i < 100;++i)
{
foo(i);
FILE *f = fopen("myfile.txt","r");
if (f == NULL) perror ("Error opening file");
else {
while ( fgets (mystring , 100 , f) != NULL );
if(!checkCorrectness(i,mystring);
break;
fclose (f);
}
}
fclose(stdout);
}
这段代码是否保存？我的意思是在调用 freopen 并且其流未关闭后调用 fopen 可以吗？谢谢
I have the following code:
int checkCorrectness(int i,char *iStr)
{
if(atoi(iStr) == i)
return 1;
return 0;
}
void foo(int i)
{
printf("inside foo %d\n",i);
}
void print()
{
char mystring[100];
freopen("myfile.txt","w+",stdout);
for(int i =0;i < 100;++i)
{
foo(i);
FILE *f = fopen("myfile.txt","r");
if (f == NULL) perror ("Error opening file");
else {
while ( fgets (mystring , 100 , f) != NULL );
if(!checkCorrectness(i,mystring);
break;
fclose (f);
}
}
fclose(stdout);
}
Is this code save?I mean is it OK to call fopen after freopen was called and its stream was not closed? Thank you
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评论（1）
你的代码看起来很安全。您可以在一个进程中多次打开同一个文件。文件描述符不会相互干扰。
我会避免像你一样重新打开标准输出。您可以使用单个 fopen 来完成整个程序，并避免您造成的混乱：查找 fprintf！
Your code looks safe. You are allowed to open the same file more than once in a process. The file descriptors will not interract.
I'd steer away from reopening stdout like you do. You could do this entire program with a single fopen and avoid the mess you're creating: look up fprintf!