C ++:将ifstream与getline()一起使用； [英] C++: Using ifstream with getline();

问题描述

检查此程序

ifstream filein("Hey.txt");
filein.getline(line,99);
cout<<line<<endl;
filein.getline(line,99);
cout<<line<<endl;
filein.close();

文件Hey.txt中包含很多字符.远超过1000

The file Hey.txt has alot of characters in it. Well over a 1000

但是我的问题是 为什么第二次我尝试打印行.它没有打印出来吗?

But my question is Why in the second time i try to print line. It doesnt get print?

推荐答案

根据C ++参考(此处)getline设置提取了count-1个字符后的ios::fail.您必须在getline()个调用之间调用filein.clear();.

According to the C++ reference (here) getline sets the ios::fail when count-1 characters have been extracted. You would have to call filein.clear(); in between the getline() calls.

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