在C中使用fopen_s

问题描述

我在C语言中编程时遇到了问题，尤其是在Visual Studio中使用fopen时.我阅读了有关 fopen_s 函数的信息，并将以下行添加到了我的项目中，但是它仍然无法正常工作.

I have a problem with programming in C, especially with fopen in Visual Studio. I read about the fopen_s function and added the following line to my project, but it still doesn't work.

_CRT_SECURE_NO_WARNINGS

所以我尝试以这种方式使用 fopen_s :

So I tried using fopen_s in this way:

FILE *fp;
errno_t err;
if ((err = fopen_s(&fp, "C:/File.txt", "rt")) != 0)
    printf("File was not opened\n");
else
    fprintf(fp, "Date: %s, Time: %s, Score: %i \n", __DATE__, __TIME__, score);
fclose(fp);

它仍然崩溃.怎么了?

推荐答案

即使打开失败，您也使用 fclose 带有无效的 fp 值.至少在 else 分支周围添加 {} .

You use fclose with an invalid fp value, even if opening failed. Add {} around the else branch, at least.

许多开发人员认为，即使在其中包含一条语句的情况下，到处都使用大括号通常是个好主意.如果不这样做，就很容易犯这样的错误，即使对于有经验的开发人员也是如此.因此，也将它们放在 then 分支周围.

Many developers think it is generally a good idea to use braces everywhere, even with one statement inside them. It's so easy to make a mistake like this if you don't, even for experienced developers. So put them around the then branch too.

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