如何在运行时删除分段错误 [英] How Do I Remove Segmentation Error During Runtime

问题描述

我编写了一个代码，一次读取多个图像，即p [1] ..... p [14].编译期间没有错误.
我在运行时遇到的错误是细分错误".
代码是:

I wrote a code to read multiple images at a time i,e p[1].....p[14] .No errors during compilation.
Error i got during run time is "segmentation fault".
code is:

#include<stdio.h>
int main(void)
{
FILE *fp;
int i;
char ch;
for(i=1;i<15;i++)
{
char fn[100];
sprintf(fn,"p[%d].gif",i);
fp=fopen("p[i].gif","rb");
fread(&ch,sizeof(ch),1,fp);
}
}

推荐答案

要做的第一件事是引入一些错误检查.
由于您为读取的每个文件使用相同的文件名:

The first thing to do is introduce some error checking.
Since you use the same file name for every file you read:

fp=fopen("p[i].gif","rb");

然后您不关闭它，在某个时候给出错误.
但是...如果文件不存在怎么办? fopen将返回空值，将其传递给fread会出现分段错误...

您可以先用sprintf调用的结果替换固定文件名，这将有所帮助-但您确实需要检查fopen的返回值，否则以后会有更多问题.完成后，关闭该死的文件！

And you don''t close it, that''s going to give an error at some point.
But...what happens if the file doesn''t exist? fopen will return a null, you will pass it to fread and you will get a segmentation fault...

You can start by replacing the fixed file name with the result from the sprintf call and that will help - but you do need to check the return value from fopen or you will have more problems later. And close your damn files when you have finished with them!

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