使用 C++ 读取管道输入
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Reading piped input with C++
提问by Erik
I am using the following code:
我正在使用以下代码：
#include <iostream>
using namespace std;
int main(int argc, char **argv) {
string lineInput = " ";
while(lineInput.length()>0) {
cin >> lineInput;
cout << lineInput;
}
return 0;
}
With the following command:
echo "Hello" | test.exe
使用以下命令：
echo "Hello" | test.exe
Thes result is an infinate loop printing "Hello". How can I make it read and print a single "Hello"?
结果是无限循环打印“你好”。我怎样才能让它读取和打印一个“你好”？
回答by Erik
string lineInput;
while (cin >> lineInput) {
cout << lineInput;
}
If you really want full lines, use:
如果你真的想要整行，请使用：
string lineInput;
while (getline(cin,lineInput)) {
cout << lineInput;
}
回答by Ben Voigt
When cinfails to extract, it doesn't change the target variable. So whatever string your program last read successfully is stuck in lineInput.
当cin提取失败时，它不会改变目标变量。因此，您的程序上次成功读取的任何字符串都卡在lineInput.
You need to check cin.fail(), and Erik has shown the preferred way to do that.
您需要检查cin.fail()，Erik 已经展示了执行此操作的首选方法。
