如何将C ++变量数据放入system（）函数 [英] How to put a c++ variable data into system() function

问题描述

如何将c ++变量数据放入system（）函数中？

How to put a c++ variable data into system() function?

请看下面的代码：

#include <iostream>
#include <windows.h>

using namespace std;

int main()
{
  cout << "name the app u want to open";

  string app;

  cin >> app;

  system("start app"); // I know this will not work! But how to make it will?
  return 0;
}

推荐答案

仅连接开始前缀和 app 变量，然后将结果作为c样式字符串传递给 system（），如下所示：

Simply concatenate the "start" prefix and app variable, and pass the result to system() as a c-style string, like this:

#include <iostream>
#include <windows.h>
using namespace std;

int main()
{
    cout<<"name the app u want to open";

    string app;
    cin>>app;

    const string cmd = "start " + app;

    system(cmd.c_str()); // <-- Use the .c_str() method to convert to a c-string.
    return 0;
}

您可以使用相同的串联技巧添加args和/或文件路径到命令：

You can use the same concatenation trick to add args and/or the file path to the command:

const string cmd = "start C:\\Windows\\System32\\" + app + " /?";

system(cmd.c_str());

上面的示例 cmd 将在文件之前路径和 /？命令行参数。

The example cmd above will prepend the file path and "/?" command line argument.

对于注释中提供的示例，您可以执行以下操作：

For your example provided in the comments, you can do something like this:

#include <iostream>
#include <windows.h>
using namespace std;

int main()
{
    cout << "Enter the profile name: ";

    string profile;
    cin >> profile;

    const string cmd = "netsh wlan connect name=\"" + profile + "\"";

    system(cmd.c_str());
    return 0;
}

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