打开文件时，ifstream会崩溃程序 [英] Ifstream crashes program when opening file

问题描述

我缩小了我的代码范围，我找到了问题的根源，就是当我打开文件时。
该文件确实存在，编译时我没有收到任何警告或错误。

I've narrowed my code down, and I found the source of the problem, it's when I open a file. The file does exists, and I don't get any warning or errors when compiling.

int main(int argc, const char* args[]) 
{
    cout << "Wellcome" << endl;
    cout << args[1];
    ifstream exists(args[1]);
    if(!exists)
    {
        printf("FILE NOT FOUND");
        return 1;
    }
    exists.close();
    ifstream* in;
    in->open(args[1],ios::binary|ios::in);
    //do stuff
    in->close();
    return 0;
}

推荐答案

您已创建指向一个 ifstream 对象，但你从未分配过 ifstream 指向它。要解决此问题，请考虑只分配堆栈：

You have created a pointer to an ifstream object, but you never allocated an ifstream for it to point to. To fix this, consider just stack-allocating it:

ifstream in;
in.open(args[1],ios::binary|ios::in);
//do stuff
in.close();

通常，您通常不需要动态分配对象，除非您希望它们比对象寿命更长创建它们。

In general, you usually don't need to dynamically allocate objects unless you want them to outlive the function that created them.

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