how to get root privilege for QProcess to run installer on Mac

Hi

I have a gui app on mac os x which want to do a auto update on start, what i want to do:
1).download the new mpkg file;
2).use QProcess to run "installer -pkg MY_APP.mpkg -target LocalSystem" to install the newly downloaded mpkg file;

my code:

Code:

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QProcess* proc = new QProcess();
    QString cmd = "installer -pkg MY_APP.mpkg -target LocalSystem";
    proc->start(cmd);
    if (!proc->waitForFinished())
        qDebug() << "install failed:" << proc->errorString();
    else
        qDebug() << "install output:" << proc->readAll();
    delete proc;

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the result is: install output: "installer: Must be run as root to install this package."
so i changed the code to like this:

Code:

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QString cmd = "sudo installer -pkg MY_APP.mpkg -target LocalSystem";

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But it didn't work and output nothing.

What i want is: when proc->start,it will pop up a system gui to let user input passwork,just like double-clicked a mpkg to start a install process.

I've searched through google and in this forum,but didn't get this solved.
Can anyone help?
Thanks in advance.

Quote:

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(...) just like double-clicked a mpkg

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I've never tried that on mac, but maybe this will work:

Code:

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QDesktopServices::openUrl(QUrl::fromLocalFile("MY_APP.mpkg"));

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quote from QDesktopServices docs:

Quote:

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If the URL is a reference to a local file (i.e., the URL scheme is "file") then it will be opened with a suitable application instead of a Web browser.

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Quote:

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Originally Posted by stampede

I've never tried that on mac, but maybe this will work:

Code:

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QDesktopServices::openUrl(QUrl::fromLocalFile("MY_APP.mpkg"));

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quote from QDesktopServices docs:

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It works and it's exactly what I want.Thank you!