[Interest] Executing PowerShell command with quotes using QProcess

[Jason Kretzer]

Good Day Everyone,

I would like to be able to run a few certain powershell commands using QProcess.  I can then read the result.  Here is an example of one that works:
    
    QProcess powershell;
    powershell.setReadChannel(QProcess::StandardOutput);
    powershell.start("PowerShell -Command \"& {(Get-WmiObject Win32_Videocontroller).Name}\"");
    powershell.waitForReadyRead(30000);
    QString allData(powershell.readAll());
    powershell.close();

At the end of this, the allData has content and life is good.

However, if I try to run the exact same code but with a powershell command that has quotes in it, for example code to just get the size of the C:
    QProcess powershellHDD;
    powershellHDD.setReadChannel(QProcess::StandardOutput);
    powershellHDD.start("PowerShell -Command \"&{(Get-WmiObject Win32_LogicalDisk -Filter \\\"DeviceID='C:’\\\").Size}\"");
    powershellHDD.waitForReadyRead(30000);
    QString dataHDDsize = powershellHDD.readAll();
    powershellHDD.close();

This does not work as I expect it to.  The dataHDDsize is an empty string “”.  If I pull the command out and run it directly from a command prompt (removing the escaping backslashes) it runs exactly as I expect it to returning a number.   I thought maybe the number is the problem and I have similar commands that return proper letters and the same thing occurs.

Style and suggestions for third party libs aside, does any one have any pointers?

Thanks!

-Jason

//--------------------------------//
    Jason R. Kretzer
    Application Developer
    jason at gocodigo.com
    606.792.0079
//--------------------------------//