Save Quake 3 path to settings on Windows. QSettings is wrapped to keep error-prone stringly typed code in one place (QSettings uses string keys).

launch.pro

@@ -13,9 +13,11 @@ TEMPLATE = app
 
 
 SOURCES += main.cpp\
-        mainwindow.cpp
+        mainwindow.cpp \
+    settings.cpp
 
-HEADERS  += mainwindow.h
+HEADERS  += mainwindow.h \
+    settings.h
 
 FORMS    += mainwindow.ui
 

mainwindow.cpp

@@ -20,14 +20,35 @@ ioLaunch::~ioLaunch()
 
 void ioLaunch::on_btnLaunch_clicked()
 {
+    QString ioq3;
+
 #ifdef Q_OS_WIN32
-    if(ioq3 == NULL)
+    // Prompt the user to set the ioq3 path if the settings value either doesn't exist or is invalid.
+    bool promptForPath = true;
+
+    if (settings.containsQuakePath())
+    {
+        const QString path = settings.getQuakePath();
+        const QDir dir(path);
+
+        if (!path.isEmpty() && dir.exists())
+            promptForPath = false;
+    }
+
+    if(promptForPath)
     {
         msg.setText("Please select your Quake3 directory");
         msg.exec();
-        QString path = QFileDialog::getExistingDirectory (this, tr("Directory"), directory.path());
+
-        ioq3 = QString("\"") + path + QDir::separator() + "ioquake3.x86.exe\" +set r_mode -1";
+        const QString path = QFileDialog::getExistingDirectory (this, tr("Directory"));
+
+        if (path.isEmpty())
+            return;
+
+        settings.setQuakePath(path);
     }
+
+    ioq3 = QString("\"") + settings.getQuakePath() + QDir::separator() + "ioquake3.x86.exe\" +set r_mode -1";
 #elif defined Q_OS_MAC
     ioq3 = "open -a ioquake3 --args +set r_mode -1";
 #elif defined Q_OS_UNIX

mainwindow.h

@@ -8,6 +8,7 @@
 #include <QtGlobal>
 #include <QFileDialog>
 #include <QDir>
+#include "settings.h"
 
 namespace Ui {
 class ioLaunch;
@@ -41,17 +42,15 @@ private slots:
 
 private:
     Ui::ioLaunch *ui;
-    QString ioq3;
     QString resOption;
     QString screenOption;
     QMessageBox msg;
     QMessageBox ioq3Failed;
-    QDir directory;
     int ioWidth;
     int ioHeight;
     bool ioWedited;
     bool ioHedited;
-
+    Settings settings;
 };
 
 #endif // MAINWINDOW_H

settings.cpp

@@ -0,0 +1,44 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 The ioquake Group
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#include <QString>
+#include "settings.h"
+
+Settings::Settings() :
+    settings("ioquake", "launch")
+{
+}
+
+QString Settings::getQuakePath() const
+{
+    return settings.value("quakePath").toString();
+}
+
+bool Settings::containsQuakePath() const
+{
+    return settings.contains("quakePath");
+}
+
+void Settings::setQuakePath(const QString &path)
+{
+    settings.setValue("quakePath", path);
+}

settings.h

@@ -0,0 +1,43 @@
+/*
+The MIT License (MIT)
+
+Copyright (c) 2013 The ioquake Group
+
+Permission is hereby granted, free of charge, to any person obtaining a copy of
+this software and associated documentation files (the "Software"), to deal in
+the Software without restriction, including without limitation the rights to
+use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
+the Software, and to permit persons to whom the Software is furnished to do so,
+subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
+FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
+COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
+IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
+CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+*/
+#ifndef SETTINGS_H
+#define SETTINGS_H
+
+#include <QSettings>
+
+class QString;
+
+class Settings
+{
+public:
+    Settings();
+
+    QString getQuakePath() const;
+    bool containsQuakePath() const;
+    void setQuakePath(const QString &path);
+
+private:
+    QSettings settings;
+};
+
+#endif // SETTINGS_H