New QTemporaryFile replacement

src/QGCTemporaryFile.cc

+/*=====================================================================
+ 
+ QGroundControl Open Source Ground Control Station
+ 
+ (c) 2009 - 2014 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ 
+ This file is part of the QGROUNDCONTROL project
+ 
+ QGROUNDCONTROL is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+ 
+ QGROUNDCONTROL is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+ 
+ ======================================================================*/
+
+/// @file
+///     @brief This class mimics QTemporaryFile. We have our own implementation due to the fact that
+///				QTemporaryFile implemenation differs cross platform making it unusable for our use-case.
+///				Look for bug reports on QTemporaryFile keeping the file locked for details.
+///
+///     @author Don Gagne <don@thegagnes.com>
+
+#include "QGCTemporaryFile.h"
+
+#include <QDir>
+#include <QStandardPaths>
+
+QGCTemporaryFile::QGCTemporaryFile(const QString& fileTemplate, QObject* parent) :
+    QFile(parent),
+    _template(fileTemplate)
+{
+
+}
+
+bool QGCTemporaryFile::open(QFile::OpenMode openMode)
+{
+    QDir tempDir(QStandardPaths::writableLocation(QStandardPaths::TempLocation));
+    
+    // Generate unique, non-existing filename
+    
+    static const char rgDigits[] = "0123456789";
+    
+    QString tempFilename;
+    
+    do {
+        QString uniqueStr;
+        for (int i=0; i<6; i++) {
+            uniqueStr += rgDigits[qrand() % 10];
+        }
+        
+        if (_template.contains("XXXXXX")) {
+            tempFilename = _template.replace("XXXXXX", uniqueStr, Qt::CaseSensitive);
+        } else {
+            tempFilename = _template + uniqueStr;
+        }
+    } while (tempDir.exists(tempFilename));
+
+    setFileName(tempDir.filePath(tempFilename));
+    
+    return QFile::open(openMode);
+}

src/QGCTemporaryFile.h

+/*=====================================================================
+ 
+ QGroundControl Open Source Ground Control Station
+ 
+ (c) 2009 - 2014 QGROUNDCONTROL PROJECT <http://www.qgroundcontrol.org>
+ 
+ This file is part of the QGROUNDCONTROL project
+ 
+ QGROUNDCONTROL is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+ 
+ QGROUNDCONTROL is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ GNU General Public License for more details.
+ 
+ You should have received a copy of the GNU General Public License
+ along with QGROUNDCONTROL. If not, see <http://www.gnu.org/licenses/>.
+ 
+ ======================================================================*/
+
+#ifndef QGCTemporaryFile_H
+#define QGCTemporaryFile_H
+
+#include <QFile>
+
+/// @file
+///     @brief This class mimics QTemporaryFile. We have our own implementation due to the fact that
+///				QTemporaryFile implemenation differs cross platform making it unusable for our use-case.
+///				Look for bug reports on QTemporaryFile keeping the file locked for details.
+///
+///     @author Don Gagne <don@thegagnes.com>
+
+class QGCTemporaryFile : public QFile {
+    Q_OBJECT
+    
+public:
+	/// @brief Creates a new temp file object. QGC temp files are always created in the
+	//			QStandardPaths::TempLocation directory.
+	//		@param template Template for file name following QTemporaryFile rules. Template should NOT include
+	//							directory path, only file name.
+    QGCTemporaryFile(const QString& fileTemplate, QObject* parent = NULL);
+
+	/// @brief Opens the file in ReadWrite mode.
+	///		@returns false - open failed
+	bool open(OpenMode openMode = ReadWrite);
+    
+private:
+    QString _template;
+};
+
+
+#endif