Several ways to display the command line console (cmd.exe) - Qt, C++

Preface

Recently, I was writing a gadget for a friend, which involved displaying a command line console. I didn't expect it to be a natural thing, but it became less natural.

Several ways to implement

Method 1 (QProcess)

Implementing it with QProcess was the first way I thought of at the time. Maybe I had been using QProcess to execute the command line before.

I originally thought it could be implemented with one line of code, as shown below. After all, it was possible to use it to call external programs before.

QProcess::execute("cmd.exe");

Then I found that it didn't work. The program (cmd.exe) was running, but no interface was displayed. I searched for a solution to the problem on Baidu and found this qt - QProcess with 'cmd' command does not result in command-line window - Stack Overflow

You need to set parameters through the function setCreateProcessArgumentsModifier to create a new console.

    m_pPro->setCreateProcessArgumentsModifier(
                [](QProcess::CreateProcessArguments *args) {
        args->flags |= CREATE_NEW_CONSOLE;
        args->startupInfo->dwFlags &=~ STARTF_USESTDHANDLES;
    });

 

Method 2 (system())

Use the function system() to implement it. I missed that the input parameter of system is a DOS command.

#include<stdlib.h>

system("cmd.exe");

 

Method three (QDesktopServices::openUrl()) 

The static function QDesktopServices::openUrl() can open local files, folders, applications or open URLs with the default browser.

      
    //QString path="https://blog.csdn.net/xiaopei_yan?type=blog";
    //QString path="C:/Users/admin/Desktop";
    QString path="cmd.exe";
    QDesktopServices::openUrl(QUrl::fromLocalFile(path));

 

Method four (CreateProcess()) 

Windows comes with a method to create a process CreateProcess(). For specific usage, please refer to 19.VC(custom)-CreateProcess function detailed explanation_Hua Xiong's Blog-CSDN Blog

    TCHAR szCmdLine[] = { TEXT("cmd.exe") };
    STARTUPINFO StartInfo = { sizeof(StartInfo) };
    PROCESS_INFORMATION ProcInfo;
    StartInfo.dwFlags = STARTF_USESHOWWINDOW;
    StartInfo.wShowWindow = TRUE;
    CreateProcess(NULL, szCmdLine, NULL, NULL, NULL, NULL, NULL, NULL, &StartInfo, &ProcInfo);

Conclusion 

Various methods are available for you to choose from.