在 C++ 中捕获分段错误

2022-01-12 00:00:00 segmentation-fault crash c++

try-catch 块是否会捕获分段错误错误?

Does a try-catch block catch segmentation fault errors?

我正在使用下面给出的函数读取文本文件，但有时文件为空并且程序崩溃.我希望程序继续运行并在此文件为空或正在使用时提供另一个文件.

I am reading a text file using the function given below but sometimes the file is empty and the program crashes. I would like the program to continue running and provide another file when this file is empty or in use.

Path2D read_gesture(const char* filename)
{
    Path2D path;
    //MultiStrokeGesture MultiStrokes;

    vector<string> text_file;

    int no_of_paths=0;
    std::ifstream ifs(filename);

    for (std::string line; std::getline(ifs, line); )
    {
        no_of_paths=no_of_paths+1;
        double a, b;
        stringstream ss(line);
        if (!(ss >> a >> b)) {cout<<"wrong format"<<endl;}
        std::cout << "You said, " << a << ", " << b << ".
";
        path.push_back(Point2D(a,b));

    }
    cout<<"saving gesture"<<endl;
    return path;


}

我尝试了类似的方法:

Path2D path;
try 
{
    path=read_gesture("test.txt");
}
catch(int e)
{
    path=read_gesture("test2.txt");
}

但程序仍然崩溃.可能是什么问题?

but the program still crashes. What might the problem be?

  • 稍微修正一下，catch中调用的文件与try中调用的文件不一样，是错别字.
  • A little correction, the file called in catch was not same as that of try, that was a typo.

推荐答案

C++ try-catch 块只处理 C++ 异常.分段错误之类的错误是较低级别的，try-catch 会忽略这些事件，其行为与没有 try-catch 块相同.

C++ try-catch blocks only handle C++ exceptions. Errors like segmentation faults are lower-level, and try-catch ignores these events and behaves the same as if there was no try-catch block.

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