在X $ C $的C 4 I / O重定向 [英] Redirecting I/O in Xcode 4

问题描述

我刚装X code 4，我试图从文件到我的C ++程序重定向输入。我已经使用通常的＆LT; infile.txt我尝试运行计划的参数一节中，但没有奏效。我可以就好了（通过编辑可执行参数）重定向输入和输出以x code 3。如何做到这一点在新版本中有什么建议？

I just installed Xcode 4 and I'm trying to redirect input from a file to my C++ program. I've tried using the usual "< infile.txt" in the "Arguments" section of my Run scheme, but that didn't work. I was able to redirect input and output in Xcode 3 just fine (by editing the arguments for the executable). Any suggestions on how to do this in the new version?

谢谢！

萨默尔

推荐答案

我拥有各类参数的测试，似乎在X code 4与参数的错误。

I tested with various types of Arguments and it appears that the XCode 4 have a bug with Arguments.

但有一个替代类似效果来模拟。您必须使用环境变量。

But there is one alternative to simulate with similar effect. You must use the Environment Variables.

添加环境变量的文件名要重定向：

Add a Environment Variable with the file name you want to redirect:

然后在你的code您必须将此文件重定向标准输入（CIN）：

Then in your code you must "redirect" this file to the standard input (cin):

#include <iostream>
#include <string>
#include <fstream>

using namespace std;

int main (int argc, const char * argv[])
{
    ifstream arq(getenv("MYARQ"));
    cin.rdbuf(arq.rdbuf());

    string value;
    cin >> value;
    cout << value;

    return 0;
}

这是它...只有2条线code的

that's it... only 2 lines of code

ifstream arq(getenv("MYARQ"));
cin.rdbuf(arq.rdbuf());

这不是最好的解决办法，但在X code具有这样的问题，这是唯一的解决办法！

it's not the best solution, but while xcode have this problem this is the only solution !

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