WMIC command is working on cmd but not in QProcess

Lemat

i wrote this code to get out:

QProcess p;
    p.setReadChannel(QProcess::StandardOutput);
    p.setReadChannelMode(QProcess::MergedChannels);
    p.start("wmic diskdrive where deviceid='\\\\.\\PHYSICALDRIVE0' get serialnumber,model,size");
    p.waitForReadyRead();
    qDebug()<<QString(p.readAllStandardOutput()).simplified().split(QRegExp("[\n\r ]"),QString::SkipEmptyParts);
    p.close();

when i run my qt app, i get this error :

("Node", "-", "Hostname", "ERROR", ":", "Description", "=", "Request", "no", "valid")

instead of:

Model        SerialNumber  Size
ST9500***AS  ********      500105249280

JonB

@Lemat said in WMIC command is working on cmd but not in QProcess:

My hunch is that there is an issue in your command-line where you have deviceid='\\\\.\\PHYSICALDRIVE0'. For example, I see example from https://superuser.com/a/647711/479430 where using

wmic DiskDrive where "DeviceID='\\\\.\\PHYSICALDRIVE<disk_index>'" Assoc /assocclass:Win32_DiskDriveToDiskPartition

while yours will generate

wmic diskdrive where deviceid='\\.\PHYSICALDRIVE0' get serialnumber,model,size

They differ in the " marks and the number of \s. Start from the exact command you need to type into Windows shell (or from documentation) and adapt it to C++/argument for QProcess from there.

@KroMignon's may work, but it will be passing deviceid='\\.\PHYSICALDRIVE0', is that what is intended?

If your issue is over the backslash count, you might find you want to use C++ raw string literal here, e.g. R"(deviceid='\\\\.\\PHYSICALDRIVE0')" or whatever you decide the final command needs to look like backslash-wise.

KroMignon

@Lemat I think you should change the function call to use an argument list to avoid space issues:

    QProcess p;
    p.setReadChannel(QProcess::StandardOutput);
    p.setReadChannelMode(QProcess::MergedChannels);
    QStringList opt;
    opt << "diskdrive" << "where" 
        << "deviceid='\\\\.\\PHYSICALDRIVE0'"
        << "get" << "serialnumber,model,size"
    p.start("wmic", opt);
    p.waitForReadyRead();
    qDebug()<<QString(p.readAllStandardOutput()).simplified().split(QRegExp("[\n\r ]"),QString::SkipEmptyParts);
    p.close();

JonB

@Lemat said in WMIC command is working on cmd but not in QProcess:

My hunch is that there is an issue in your command-line where you have deviceid='\\\\.\\PHYSICALDRIVE0'. For example, I see example from https://superuser.com/a/647711/479430 where using

wmic DiskDrive where "DeviceID='\\\\.\\PHYSICALDRIVE<disk_index>'" Assoc /assocclass:Win32_DiskDriveToDiskPartition

while yours will generate

wmic diskdrive where deviceid='\\.\PHYSICALDRIVE0' get serialnumber,model,size

They differ in the " marks and the number of \s. Start from the exact command you need to type into Windows shell (or from documentation) and adapt it to C++/argument for QProcess from there.

@KroMignon's may work, but it will be passing deviceid='\\.\PHYSICALDRIVE0', is that what is intended?

If your issue is over the backslash count, you might find you want to use C++ raw string literal here, e.g. R"(deviceid='\\\\.\\PHYSICALDRIVE0')" or whatever you decide the final command needs to look like backslash-wise.

Lemat

@KroMignon thank for your reply. but it not work.

KroMignon

@Lemat Hi, I see the problem, you need to escape the backslashes:

    QProcess p;
    p.setReadChannel(QProcess::StandardOutput);
    p.setReadChannelMode(QProcess::MergedChannels);
    QStringList opt;
    opt << "diskdrive" << "where" 
        << "deviceid='\\\\\\\\.\\\\PHYSICALDRIVE0'"
        << "get" << "serialnumber,model,size"
    p.start("wmic", opt);
    p.waitForFinished();
    qDebug()<<QString(p.readAllStandardOutput()).simplified().split(QRegExp("[\n\r ]"),QString::SkipEmptyParts);
    p.close();

Lemat

@JonB you saved my afternoon. i forgot R"()" utilization. i had used it over QFile and QByteArray for another app. thanks!! thanks!!!!!

Lemat

@KroMignon good answer again. thanks for you time!!!. very thanks!!!.