[Interest] QSettings possible bug on Windows

[Scott Aron Bloom]

Two things..


1)      Try doing a foreach( const QString & child, reg.childKeys() ) and see, maybe there is a typo you are missing

2)      Take a look at the Qt source code for qdesktopservices_win.cpp  It uses SHGetSpecialFolder to find the directories you are looking for.
Scott

From: interest-bounces+scott.bloom=onshorecs.com at qt-project.org [mailto:interest-bounces+scott.bloom=onshorecs.com at qt-project.org] On Behalf Of Alex Malyushytskyy
Sent: Monday, September 30, 2013 7:02 PM
To: interest at qt-project.org
Subject: Re: [Interest] QSettings possible bug on Windows

Just want to add that key is found,

qDebug() << "child keys = " <<  reg.childKeys();
result in

child keys =  ("Common Administrative Tools", "Common AppData", "Common Desktop", "Common Documents", "Common Programs", "Common Start Menu", "Common Startup", "Common Templates", "CommonMusic", "CommonPictures", "CommonVideo", "OEM Links", "Personal")

but value returned is empty string - different from visible in regedit
Alex

On Mon, Sep 30, 2013 at 6:24 PM, Alex Malyushytskyy <alexmalvtk at gmail.com<mailto:alexmalvtk at gmail.com>> wrote:
I found a problem with QSettings when trying to read from registry.
I am using  Qt 4.7.3 so I would appreciate if anybody can check with Qt 5 at least.
Problem:
QSettings fails to return specific key value (Common AppData) when read other keys at the same level just fine.
Key exists and verified with regedit.
Test case is below:

#include <QApplication>
#include <QSettings>
#include <QDebug>

void ddd2();

int main(int argc, char *argv[])
{
// execute test and return
    QApplication a(argc, argv);
    ddd2();

    return 0;
}

void ddd2()
{
    QSettings reg("HKEY_LOCAL_MACHINE\\Software\\Microsoft\\Windows\\CurrentVersion\\Explorer\\Shell Folders",
        QSettings::NativeFormat);
    QString key;
    QString val;

    key = QString("Common AppData");
    val = QString ( reg.value(key).toString());
    qDebug() << "key: " << key << " value: " << val;

    key = QString("Common Desktop");
    val = QString ( reg.value(key).toString());
    qDebug() << "key: " << key << " value: " << val;

    key = QString("Common Documents");
    val = QString ( reg.value(key).toString());
    qDebug() << "key: " << key << " value: " << val;
}
Output:

key:  "Common AppData"  value:  ""
key:  "Common Desktop"  value:  "C:\Users\Public\Desktop"
key:  "Common Documents"  value:  "C:\Users\Public\Documents"
Expected
 * WinXP: "c:\Documents and Settings\All Users\Application Data"
 * WinV/7/8: "c:\ProgramData"

Regards,
   Alex

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