How to read registry entries

[Abc]

I am calling an application built in C# from my Qt application. In the C# application I have some registry entires made. I want to read these entries in my Qt program and display certain messages depending on the value obtained. Please let me know how to do this.

[jpn]

See QSettings. Notice especially "Accessing the Windows Registry Directly" in the detailed description.

[Abc]

I read about QSettings but I am still not able to do it.
Can you please give a little more explanation about doing the same??

[santhoshv84]

Hi,

Use QSettings like this..

QSettings settings;
//setValue is to set the value to the registry.
settings.setValue("somekey", ui.someButton->isChecked() );

//value is to get the stored value from the registry..
settings.value("somekey", true).toBool();

All the best..

[patrik08]

search getGSDefaultExeName on file
http://fop-miniscribus.googlecode.co...tpanelmime.cpp
is part from http://www.qtcentre.org/forum/f-qt-p...=qtextdocument
a small qtextedit display on paper format like word openoffice..


here a small example to search on regedit on this case it search GhostScript by version....

/* find gpl GhostScript path or exe */
QString 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();
	QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript"));
	//////////qDebug() << "### gsonly " <<  gsonly;
	for (int i = 0; i < gsonly.size(); ++i)
	{
		const QString RealName = gsonly.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 = "";
	return gsName;
#endif

/* find gpl GhostScript path or exe */
QString 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();
	QStringList gsonly = allsoftware.filter(QRegExp("Ghostscript"));
	//////////qDebug() << "### gsonly " <<  gsonly;
	for (int i = 0; i < gsonly.size(); ++i)
	{
		const QString RealName = gsonly.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 = "";
	return gsName;
#endif

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[Abc]

I understood about QSettings but still not getting what I intend.

I have a key named 'Status' which can take two values 'success' or 'failed' according to the process and is available in the path 'Software/Burn'. I want to display some message depending on the value obtained. I have done it like...

QSettings settings("HKEY_CURRENT_USER/Software/Burn", QSettings::NativeFormat);
QString value = settings.value("HKEY_CURRENT_USER/Software/Burn/Status").toString();
if(value == "failed") {
	// display some message
} else if(value == "success") {
	// display some message
}

QSettings settings("HKEY_CURRENT_USER/Software/Burn", QSettings::NativeFormat);
QString value = settings.value("HKEY_CURRENT_USER/Software/Burn/Status").toString();
if(value == "failed") {
	// display some message
} else if(value == "success") {
	// display some message
}

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Please let me know what's wrong in this, why doesn't it work???

[jpn]

Please follow the example in the docs. Your attempt is radically different. Notice what docs say about slashes and about registry entries appearing under the specified path.

[Abc]

Still does not work for me...

Did u mean that I should do something like...

QSettings settings("HKEY_CURRENT_USER\\Software\\Burn", QSettings::NativeFormat);
QString value = settings.value("Status").toString();
if(value == "failed") {
	// display some message
} else if(value == "success") {
       // display some other message
}

QSettings settings("HKEY_CURRENT_USER\\Software\\Burn", QSettings::NativeFormat);
QString value = settings.value("Status").toString();
if(value == "failed") {
	// display some message
} else if(value == "success") {
       // display some other message
}

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Please tell me what's going wrong now.

[jpn]

Could you export and paste contents of HKEY_CURRENT_USER\\Software\\Burn?

[Abc]

The contents are as follows...

(Default) REG_SZ (value not set)
Status REG_SZ failed
CommPort REG_DWORD 0x00000003(3)
CommSpeed REG_DWORD 0x00000000(0)
FileName REG_SZ C:/Documnets & Settings/.... (path to the file)

[jpn]

Is that really an export? As far as I remember it looks a bit different. I wanted to assure that the path is actually correct but I guess you've already done that. Anyway, what does

qDebug() << settings.childKeys();
qDebug() << settings.childGroups();

qDebug() << settings.childKeys();
qDebug() << settings.childGroups();

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output?