为什么seekg无法与getline一起使用? [英] Why seekg does not work with getline?

问题描述

当我在myFile中达到EOF时，Seekg似乎不起作用.

Seekg does not seem to work, when I reach EOF in myFile.

ifstream myFile("/path/file");
for(int i; i < 10; i++){
    myFile.seekg(0);//reset position in myFile
    while(getline(myFile, line)){
        doSomething
    }
}

所以，现在我在每个循环中打开输入流:

So, now I am opening input stream every loop:

for(int i; i < 10; i++){
    ifstream myFile("/path/file");//reset position in myFile
    while(getline(myFile, line)){
        doSomething
    }
}

但是我宁愿寻求第0位.我该如何实现?

But I would rather seek to position 0. How can I achieve that?

推荐答案

请确保在调用myFile.seekg()之前清除错误标志:

Make sure you clear the error flags before the call to myFile.seekg():

myFile.clear();

设置了EOF标志后，您将无法提取任何内容.您必须清除这些标志才能再次提取.

After the EOF flag has ben set, you will not be able to extract anything. You have to clear those flags to be able to extract again.

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