Store directory where the last log file was stored

and reuse it when loading or saving new log files

src/ui/QGCMAVLinkLogPlayer.cc

@@ -167,9 +167,14 @@ bool QGCMAVLinkLogPlayer::reset(int packetIndex)
     }
 }
 
-bool QGCMAVLinkLogPlayer::selectLogFile()
+/**
+ * @brief QGCMAVLinkLogPlayer::selectLogFile
+ * @param startDirectory Directory where the file dialog will be opened
+ * @return filename of the logFile
+ */
+bool QGCMAVLinkLogPlayer::selectLogFile(const QString startDirectory)
 {
-    QString fileName = QFileDialog::getOpenFileName(this, tr("Specify MAVLink log file name to replay"), QDesktopServices::storageLocation(QDesktopServices::DesktopLocation), tr("MAVLink or Binary Logfile (*.mavlink *.bin *.log)"));
+    QString fileName = QFileDialog::getOpenFileName(this, tr("Specify MAVLink log file name to replay"), startDirectory, tr("MAVLink or Binary Logfile (*.mavlink *.bin *.log)"));
 
     if (fileName == "")
     {
@@ -370,6 +375,7 @@ void QGCMAVLinkLogPlayer::logLoop()
             //qDebug() << "START TIME: " << startTime;
 
             // Check if these bytes could be correctly decoded
+            // TODO
             if (!ok)
             {
                 ui->logStatsLabel->setText(tr("Error decoding first timestamp, aborting."));
@@ -381,14 +387,15 @@ void QGCMAVLinkLogPlayer::logLoop()
 
 
         // Initialization seems fine, load next chunk
+        //this is ok because before we already read the timestamp of this paket before
         QByteArray chunk = logFile.read(timeLen+packetLen);
-        QByteArray packet = chunk.mid(0, packetLen);
+        QByteArray packet = chunk.left(packetLen);
 
         // Emit this packet
         emit bytesReady(logLink, packet);
 
         // Check if reached end of file before reading next timestamp
-        if (chunk.length() < timeLen+packetLen || logFile.atEnd())
+        if (chunk.length() < (timeLen + packetLen) || logFile.atEnd())
         {
             // Reached end of file
             reset();
@@ -400,6 +407,7 @@ void QGCMAVLinkLogPlayer::logLoop()
         }
 
         // End of file not reached, read next timestamp
+        // which is located after current packet
         QByteArray rawTime = chunk.mid(packetLen);
 
         // This is the timestamp of the next packet

src/ui/QGCMAVLinkLogPlayer.h

@@ -49,7 +49,7 @@ public slots:
     /** @brief Reset the logfile */
     bool reset(int packetIndex=0);
     /** @brief Select logfile */
-    bool selectLogFile();
+    bool selectLogFile(const QString startDirectory);
     /** @brief Load log file */
     bool loadLogFile(const QString& file);
     /** @brief Jump to a position in the logfile */

src/ui/QGCToolBar.cc

@@ -38,7 +38,8 @@ QGCToolBar::QGCToolBar(QWidget *parent) :
     batteryVoltage(0),
     wpId(0),
     wpDistance(0),
-    systemArmed(false)
+    systemArmed(false),
+    lastLogDirectory(QDesktopServices::storageLocation(QDesktopServices::DesktopLocation))
 {
     setObjectName("QGC_TOOLBAR");
 
@@ -123,6 +124,8 @@ QGCToolBar::QGCToolBar(QWidget *parent) :
     // Set the toolbar to be updated every 2s
     connect(&updateViewTimer, SIGNAL(timeout()), this, SLOT(updateView()));
     updateViewTimer.start(2000);
+
+    loadSettings();
 }
 
 void QGCToolBar::heartbeatTimeout(bool timeout, unsigned int ms)
@@ -171,13 +174,13 @@ void QGCToolBar::playLogFile(bool checked)
             player->playPause(false);
             if (checked)
             {
-                if (!player->selectLogFile()) return;
+                if (!player->selectLogFile(lastLogDirectory)) return;
             }
         }
         // If no replaying happens already, start it
         else
         {
-            if (!player->selectLogFile()) return;
+            if (!player->selectLogFile(lastLogDirectory)) return;
         }
         player->playPause(checked);
     }
@@ -192,7 +195,7 @@ void QGCToolBar::logging(bool checked)
     if (checked)
     {
 		// Prompt the user for a filename/location to save to
-        QString fileName = QFileDialog::getSaveFileName(this, tr("Specify MAVLink log file to save to"), QDesktopServices::storageLocation(QDesktopServices::DesktopLocation), tr("MAVLink Logfile (*.mavlink *.log *.bin);;"));
+        QString fileName = QFileDialog::getSaveFileName(this, tr("Specify MAVLink log file to save to"), lastLogDirectory, tr("MAVLink Logfile (*.mavlink *.log *.bin);;"));
 
 		// Check that they didn't cancel out
 		if (fileName.isNull())
@@ -224,6 +227,7 @@ void QGCToolBar::logging(bool checked)
         {
             MainWindow::instance()->getMAVLink()->setLogfileName(fileName);
             MainWindow::instance()->getMAVLink()->enableLogging(true);
+            lastLogDirectory = file.absoluteDir().absolutePath(); //save last log directory
         }
     }
 }
@@ -486,6 +490,24 @@ void QGCToolBar::connectLink(bool connect)
 
 }
 
+
+void QGCToolBar::loadSettings()
+{
+    QSettings settings;
+    settings.beginGroup("QGC_TOOLBAR");
+    lastLogDirectory = settings.value("LAST_LOG_DIRECTORY", lastLogDirectory).toString();
+    settings.endGroup();
+}
+
+void QGCToolBar::storeSettings()
+{
+    QSettings settings;
+    settings.beginGroup("QGC_TOOLBAR");
+    settings.setValue("LAST_LOG_DIRECTORY", lastLogDirectory);
+    settings.endGroup();
+    settings.sync();
+}
+
 void QGCToolBar::clearStatusString()
 {
     lastSystemMessage = "";
@@ -494,6 +516,7 @@ void QGCToolBar::clearStatusString()
 
 QGCToolBar::~QGCToolBar()
 {
+    storeSettings();
     if (toggleLoggingAction) toggleLoggingAction->deleteLater();
     if (logReplayAction) logReplayAction->deleteLater();
 }

src/ui/QGCToolBar.h

@@ -80,6 +80,8 @@ public slots:
 
 protected:
     void createCustomWidgets();
+    void storeSettings();
+    void loadSettings();
 
     QAction* toggleLoggingAction;
     QAction* logReplayAction;
@@ -109,6 +111,7 @@ protected:
     quint64 lastSystemMessageTimeMs;
     QTimer updateViewTimer;
     bool systemArmed;
+    QString lastLogDirectory;
 };
 
 #endif // QGCTOOLBAR_H