由于长路径导致的打开错误，不存在这样的文件

Question

我想知道fopen是否由于长路径而失败，或者文件不存在

#include<stdio.h>
#include <errno.h>
extern int errno ;
int main(){
FILE *p;
int errnum;
p=fopen("C:\\Users\\kkm\\testtttttttttttttttttttttttttttttttttttttt\\aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\\bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\\ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc\\b.txt","w");
//p=fopen("C:\\Users\\kkm\\testtttttttttttttttttttttttttttttttttttttt\\xxxx.txt","r");
if (p == NULL) {

      errnum = errno;
      fprintf(stderr, "Value of errno: %d\n", errno);
      perror("Error printed by perror");
      fprintf(stderr, "Error opening file: %s\n", strerror( errnum ));
   } else {

      fclose (p);
   }
return 0;
}

第一个fopen的路径很长，而第二个fopen的路径很短，但是文件不存在。对于这两种情况，输出都是相似的：

Value of errno: 2
Error printed by perror: No such file or directory
Error opening file: No such file or directory

有没有办法知道区别？

Answer 1

使用extended-length-path语法调用例程；为路径加上\\?\前缀。在您的情况下，将是

p=fopen("\\\\?\\C:\\Users\\kkm\\testtttttttttttttttttttttttttttttttttttttt\\aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa\\bbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb\\ccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccccc\\b.txt","w");