具有用户定义输入的 C++ Robocopy

Question

我是 C++ 的初学者，目前正在尝试编写一个小程序来帮助对网络设备进行 robocopy 备份，到目前为止，我已经编写了以下代码，但是当我尝试编译时出现以下错误:

31 '"ROBOCOPY//"<< oldname' 中的 'operator<<' 不匹配

我在使用 robocopy 的所有行中重复出现相同的错误，将不胜感激任何帮助。谢谢大家

#include <iostream>
#include <cstdlib>
using namespace std;



int main()
{
      string oldname;
      string newname;
      string userid;  
      char response;        


      cout<<"Please input old device name eg XXXXXX\n";
      cin>> oldname;

      cout<<"Please input new device name eg XXXXXX\n";
      cin>> newname;

      cout<<"Please input userid eg SP12345\n";
      cin>> userid;                  

      cout<<"Does your current device contain a D: drive? Y or N?";
      cin>> response;

                  if (response == 'Y')
                  {

                   std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/Desktop //"<<newname<<"/C$/Users/"<<userid<<"/Desktop /MIR /w:0 /r:0");
                   std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/Favorites //"<<newname<<"/C$/Users/"<<userid<<"/Favorites /MIR /w:0 /r:0");
                   std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/My Documents //"<<newname<<"/C$/Users/"<<userid<<"/My Documents /MIR /w:0 /r:0");
                   std::system("ROBOCOPY //"<<oldname<<"/d$ //"<<newname<<"/C$/Users/"<<userid<<"/Desktop/D backup /MIR /w:0 /r:0";
                       }        

                  else if (response == 'N')
                  {
                       std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/Desktop //"<<newname<<"/C$/Users/"<<userid<<"/Desktop /MIR /w:0 /r:0;
                       std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/Favorites //"<<newname<<"/C$/Users/"<<userid<<"/Favorites /MIR /w:0 /r:0;
                       std::system("ROBOCOPY //"<<oldname<<"/c$/Users/"<<userid<<"/My Documents //"<<newname<<"/C$/Users/"<<userid<<"/My Documents /MIR /w:0 /r:0;
                       }

                system("pause");          
}

Answer 1

首先，这个简单的语句是行不通的:

std::string str;
system(str); //<== expecting C-string

因为 system 需要一个以 null 结尾的 C 字符串，而不是 std::string。添加文本会使情况变得更糟:

system("text" + str);

编译器不知道如何处理它。

其次，system无法正确传递命令行参数。您需要 CreateProcess 或 ShellExecuteEx

您可能还必须传递应用程序的完整路径。示例:

#include <iostream>
#include <string>
#include <sstream>
#include <Windows.h>

void foo(std::string userid, std::string oldname, std::string newname)
{
    std::stringstream ss;
    ss  << "c:\\Program Files (x86)\\Full Path\\Robocopy.exe" 
        << " /c:\\users\\" << userid << "\\Desktop\\" << oldname 
        << " /c:\\users\\" << userid << "\\Desktop\\" << newname
        << " /MIR /w:0 /r:0";

    std::string commandLine = ss.str();

    //examine the commandline!
    std::cout << commandLine << "\n";

    STARTUPINFOA si;
    PROCESS_INFORMATION pi;
    memset(&si, 0, sizeof(si));
    si.cb = sizeof(si);
    memset(&pi, 0, sizeof(pi));

    char *buf = _strdup(commandLine.c_str());
    CreateProcessA(0, buf, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi);
    free(buf);
}

int main()
{
    foo("x", "y", "z");
    return 0;
}