QSettings , read only avaiable?

**patrik08** · 18th November 2007, 10:12

I try to find the path from GPL Ghostscript ..
I find the path ... and is installed 8.60.
Now how i can make QSettings read only...
to not make 39 new Regedit empty path?

Qt Code:

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/* find gpl GhostScript path or exe */
QString PS_utils::getGSDefaultExeName()
{
	QString gsName;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate GhostScript thanks to the qsetting
	gsName = "gswin32c.exe";
    for(int i=0;i<99;i++)  {
        /* loop all avaiable version on 8+ */
        QSettings gs_sett("HKEY_LOCAL_MACHINE\\Software\\GPL Ghostscript\\8."+QString("%1").arg(100 - i),QSettings::NativeFormat);
        if (gs_sett.allKeys().size() > 2) {
           if (gs_sett.value("GS_DLL").toString().size() > 4) {
               Pinfo.setFile(gs_sett.value("GS_DLL").toString());
               return gsName.prepend(Pinfo.absolutePath()+"/");
           }
       }
    }  
    for(int e=0;e<99;e++)  {
        /* loop all avaiable version on 7+ */
        QSettings gs_sett7("HKEY_LOCAL_MACHINE\\Software\\GPL Ghostscript\\7."+QString("%1").arg(100 - e),QSettings::NativeFormat);
        if (gs_sett7.allKeys().size() > 2) {
           if (gs_sett7.value("GS_DLL").toString().size() > 4) {
               Pinfo.setFile(gs_sett7.value("GS_DLL").toString());
               return gsName.prepend(Pinfo.absolutePath()+"/");
           }
       }
    } 
    /* win not having GPL Ghostscript ! */
    gsName = "gs";   
#else
	gsName = "gs";
#endif
	return gsName;
}

/* find gpl GhostScript path or exe */
QString PS_utils::getGSDefaultExeName()
{
	QString gsName;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate GhostScript thanks to the qsetting
	gsName = "gswin32c.exe";
    for(int i=0;i<99;i++)  {
        /* loop all avaiable version on 8+ */
        QSettings gs_sett("HKEY_LOCAL_MACHINE\\Software\\GPL Ghostscript\\8."+QString("%1").arg(100 - i),QSettings::NativeFormat);
        if (gs_sett.allKeys().size() > 2) {
           if (gs_sett.value("GS_DLL").toString().size() > 4) {
               Pinfo.setFile(gs_sett.value("GS_DLL").toString());
               return gsName.prepend(Pinfo.absolutePath()+"/");
           }
       }
    }  
    for(int e=0;e<99;e++)  {
        /* loop all avaiable version on 7+ */
        QSettings gs_sett7("HKEY_LOCAL_MACHINE\\Software\\GPL Ghostscript\\7."+QString("%1").arg(100 - e),QSettings::NativeFormat);
        if (gs_sett7.allKeys().size() > 2) {
           if (gs_sett7.value("GS_DLL").toString().size() > 4) {
               Pinfo.setFile(gs_sett7.value("GS_DLL").toString());
               return gsName.prepend(Pinfo.absolutePath()+"/");
           }
       }
    } 
    /* win not having GPL Ghostscript ! */
    gsName = "gs";   
#else
	gsName = "gs";
#endif
	return gsName;
}

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**jpn** · 18th November 2007, 10:42

You might want to construct only one QSettings object instead of constructing hundreds of them in those loops.

Start iterating from "HKEY_LOCAL_MACHINE\\Software" and go deeper in the hierarchy only if childGroups() contains "GPL Ghostscript" etc.

**patrik08** · 18th November 2007, 12:45

Originally Posted by jpn

You might want to construct only one QSettings object instead of constructing hundreds of them in those loops.

Start iterating from "HKEY_LOCAL_MACHINE\\Software" and go deeper in the hierarchy only if childGroups() contains "GPL Ghostscript" etc.

This work on GPL Ghostscript ..
if (AFPL Ghostscript) i suppose can find...

Tanks for idea...

Qt Code:

Switch view

/* find gpl GhostScript path or exe */
QString PS_utils::getGSDefaultExeName()
{
	QString gsName;
    QString gVersion;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate GhostScript thanks to the qsetting
	 gsName = "gswin32c.exe";
     QSettings softs("HKEY_LOCAL_MACHINE\\Software",QSettings::NativeFormat);
     QStringList allsoftware = softs.childGroups();
         for (int i = 0; i < allsoftware.size(); ++i) {
              const QString RealName = allsoftware.at(i);  /* realpath */
                      if (RealName.contains("Ghostscript")) {
                       qDebug() << "### soft " <<  RealName;
                       for(int e=1;e<99;e++)  {
                           /* check version 8 ++ 99 down */
                           gVersion = QString("8.%1").arg(100 - e);
                           if (softs.value(RealName+"/"+gVersion+"/GS_DLL").toString().size() > 6 ) {
                               Pinfo.setFile(softs.value(RealName+"/"+gVersion+"/GS_DLL").toString());
                               return gsName.prepend(Pinfo.absolutePath()+"/");
                           }
                           /* check version 7 ++ 99 down */
                           gVersion = QString("7.%1").arg(100 - e);
                           if (softs.value(RealName+"/"+gVersion+"/GS_DLL").toString().size() > 6 ) {
                               Pinfo.setFile(softs.value(RealName+"/"+gVersion+"/GS_DLL").toString());
                               return gsName.prepend(Pinfo.absolutePath()+"/");
                           }
                       }
               }
         }
 
    /* win not having GPL Ghostscript ! */
    gsName = "rundll32.exe  url.dll,FileProtocolHandler  http://pages.cs.wisc.edu/~ghost/";   
#else
	gsName = "gs";
#endif
	return gsName;
}

/* find gpl GhostScript path or exe */
QString PS_utils::getGSDefaultExeName()
{
	QString gsName;
    QString gVersion;
#if defined Q_WS_WIN
    QFileInfo Pinfo;
	// Try to locate GhostScript thanks to the qsetting
	 gsName = "gswin32c.exe";
     QSettings softs("HKEY_LOCAL_MACHINE\\Software",QSettings::NativeFormat);
     QStringList allsoftware = softs.childGroups();
         for (int i = 0; i < allsoftware.size(); ++i) {
              const QString RealName = allsoftware.at(i);  /* realpath */
                      if (RealName.contains("Ghostscript")) {
                       qDebug() << "### soft " <<  RealName;
                       for(int e=1;e<99;e++)  {
                           /* check version 8 ++ 99 down */
                           gVersion = QString("8.%1").arg(100 - e);
                           if (softs.value(RealName+"/"+gVersion+"/GS_DLL").toString().size() > 6 ) {
                               Pinfo.setFile(softs.value(RealName+"/"+gVersion+"/GS_DLL").toString());
                               return gsName.prepend(Pinfo.absolutePath()+"/");
                           }
                           /* check version 7 ++ 99 down */
                           gVersion = QString("7.%1").arg(100 - e);
                           if (softs.value(RealName+"/"+gVersion+"/GS_DLL").toString().size() > 6 ) {
                               Pinfo.setFile(softs.value(RealName+"/"+gVersion+"/GS_DLL").toString());
                               return gsName.prepend(Pinfo.absolutePath()+"/");
                           }
                       }
               }
         }
    
    /* win not having GPL Ghostscript ! */
    gsName = "rundll32.exe  url.dll,FileProtocolHandler  http://pages.cs.wisc.edu/~ghost/";   
#else
	gsName = "gs";
#endif
	return gsName;
}

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**jpn** · 18th November 2007, 13:55

Those loops still bother me so here's an improvement idea:

Qt Code:

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QStringList allsoftware = softs.childGroups();
// pick matching strings
QStringList gs = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
// sort by version
qSort(gs.begin(), gs.end(), gsVersionGreaterThan);
// now the first item of gs is "Ghostscript M.N" with latest version (unless gs is empty, of course)

QStringList allsoftware = softs.childGroups();
// pick matching strings
QStringList gs = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
// sort by version
qSort(gs.begin(), gs.end(), gsVersionGreaterThan);
// now the first item of gs is "Ghostscript M.N" with latest version (unless gs is empty, of course)

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The compare function would look more or less something like this:

Qt Code:

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bool gsVersionGreaterThan(const QString& s1, const QString& s2)
{
    QRegExp regExp1("Ghostscript (\\d+)\\.(\\d+)");
    QRegExp regExp2("Ghostscript (\\d+)\\.(\\d+)");
    int pos1 = regExp1.indexIn(s1);
    int pos2 = regExp2.indexIn(s2);
    if (pos1 > -1 && pos2 > -1)
    {
        int maj1 = regExp1.cap(1).toInt();
        int maj2 = regExp2.cap(1).toInt();
        int min1 = regExp1.cap(2).toInt();
        int min2 = regExp2.cap(2).toInt();
        return maj1 > maj2 || (maj1 == maj2 && min1 > min2);
    }
    return false;
}

bool gsVersionGreaterThan(const QString& s1, const QString& s2)
{
    QRegExp regExp1("Ghostscript (\\d+)\\.(\\d+)");
    QRegExp regExp2("Ghostscript (\\d+)\\.(\\d+)");
    int pos1 = regExp1.indexIn(s1);
    int pos2 = regExp2.indexIn(s2);
    if (pos1 > -1 && pos2 > -1)
    {
        int maj1 = regExp1.cap(1).toInt();
        int maj2 = regExp2.cap(1).toInt();
        int min1 = regExp1.cap(2).toInt();
        int min2 = regExp2.cap(2).toInt();
        return maj1 > maj2 || (maj1 == maj2 && min1 > min2);
    }
    return false;
}

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**patrik08** · 18th November 2007, 14:23

Originally Posted by jpn

Those loops still bother me so here's an improvement idea:

Qt Code:

Switch view

QStringList allsoftware = softs.childGroups();
// pick matching strings
QStringList gs = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
// sort by version
qSort(gs.begin(), gs.end(), gsVersionGreaterThan);
// now the first item of gs is "Ghostscript M.N" with latest version (unless gs is empty, of course)

QStringList allsoftware = softs.childGroups();
// pick matching strings
QStringList gs = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
// sort by version
qSort(gs.begin(), gs.end(), gsVersionGreaterThan);
// now the first item of gs is "Ghostscript M.N" with latest version (unless gs is empty, of course)

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You forget the separator //\\

version xx is other childGroups().

avaiable is:
GPL Ghostscript/8.60/
GPL Ghostscript/8.53/
GPL Ghostscript/7.07/
AFPL Ghostscript/8.54/
AFPL Ghostscript/8.50/

GPL Ghostscript / * version 10 time
AFPL Ghostscript / * version 12 time

QRegExp("Ghostscript") find to AFPL Ghostscript and return a small list..

Qt Code:

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QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript"));
qDebug() << "### gsonly " <<  gsonly;
/* return  ### gsonly  ("GPL Ghostscript") */

QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript"));
qDebug() << "### gsonly " <<  gsonly;
/* return  ### gsonly  ("GPL Ghostscript") */

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Qt Code:

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QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
qDebug() << "### gsonly " <<  gsonly;
/* return  ### gsonly  ("")   not found */

QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript \\d+\\.\\d+"));
qDebug() << "### gsonly " <<  gsonly;
/* return  ### gsonly  ("")   not found */

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**jpn** · 18th November 2007, 15:21

Well, like I said, it was an improvement idea. I didn't even mean to give a 100% ready solution.

But alright, this changes the situation a bit. It might be easiest to check whether such application exists, go into the child group and pick version numbers:

Qt Code:

Switch view

QStringList allsoftware = settings.childGroups();
if (allsoftware.contains("GPL Ghostscript"))
{
    settings.beginGroup("GPL Ghostscript");
    QStringList versions = settings.childGroups();
    qSort(versions.begin(), versions.end(), versionGreaterThan);
    settings.endGroup();
    ...
}

QStringList allsoftware = settings.childGroups();
if (allsoftware.contains("GPL Ghostscript"))
{
    settings.beginGroup("GPL Ghostscript");
    QStringList versions = settings.childGroups();
    qSort(versions.begin(), versions.end(), versionGreaterThan);
    settings.endGroup();
    ...
}

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This also simplifies the compare function a bit.

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