使用 QProcess 静默执行 CMD 命令

Question

I wanted to execute some cmd command and then save their result for further work. I used system() for my purposes but it doesn't work silently. When system() executes my commands, a console window will appear. I didn't want console windows to appear to the user. How can I overwrite the following function with qprocess to execute my cmd command silently?

bool MainWindow::CreateTemporaryFiles()
{
    QString command_description = "wmic logicaldisk get description > C:\\Users\\Test\\AppData\\Local\\Temp\\description.log";
    system(command_description.toStdString().c_str());

    QString command_device_name = "wmic logicaldisk get DeviceID > C:\\Users\\Test\\AppData\\Local\\Temp\\names.log";
    system(command_device_name.toStdString().c_str());

    QString command_free_space = "wmic logicaldisk get FreeSpace > C:\\Users\\Test\\AppData\\Local\\Temp\\space.log";
    system(command_free_space.toStdString().c_str());

    QString command_size = "wmic logicaldisk get size > C:\\Users\\Test\\AppData\\Local\\Temp\\size.log";
    system(command_size.toStdString().c_str());

    QString command_file_system = "wmic logicaldisk get FileSystem > C:\\Users\\Test\\AppData\\Local\\Temp\\file.log";
    system(command_file_system.toStdString().c_str());

    QString command_sysname = "wmic logicaldisk get SystemName > C:\\Users\\Test\\AppData\\Local\\Temp\\sysname.log";
    system(command_sysname.toStdString().c_str());

    return true;
}

Answer 1

You can use popen to run a command and get the output.

You can find an example here .

QProcess allows you to do that also. QProcess docs explain how to do it. Several examples here .

(Edited.)

If you need direct Windows, you have a complete example in the docs .

This was shown as example.

#include <stdio.h>

int main(void)
{
        FILE *pipein_fp, *pipeout_fp;
        char readbuf[80];

        /* Create one way pipe line with call to popen() */
        if (( pipein_fp = popen("ls", "r")) == NULL)
        {
                perror("popen");
                exit(1);
        }

        /* Create one way pipe line with call to popen() */
        if (( pipeout_fp = popen("sort", "w")) == NULL)
        {
                perror("popen");
                exit(1);
        }

        /* Processing loop */
        while(fgets(readbuf, 80, pipein_fp))
                fputs(readbuf, pipeout_fp);

        /* Close the pipes */
        pclose(pipein_fp);
        pclose(pipeout_fp);

        return(0);
}