Revamp the Console Synchronous Writer Example

* Use the 'const' keywords more.
* Split very long lines.
* Remove QT_USE_NAMESPACE macro.
* Update includes to common style.

Task-number: QTBUG-60652
Change-Id: I920ff6f7de9cede2e761cb629ab89945e70254d9
Reviewed-by: André Hartmann <aha_1980@gmx.de>
Reviewed-by: Alex Blasche <alexander.blasche@qt.io>

examples/serialport/cwritersync/main.cpp

@@ -48,43 +48,45 @@
 **
 ****************************************************************************/
 
-#include <QtSerialPort/QSerialPort>
-
-#include <QTextStream>
 #include <QCoreApplication>
 #include <QFile>
+#include <QSerialPort>
 #include <QStringList>
-
-QT_USE_NAMESPACE
+#include <QTextStream>
 
 int main(int argc, char *argv[])
 {
     QCoreApplication coreApplication(argc, argv);
-    int argumentCount = QCoreApplication::arguments().size();
-    QStringList argumentList = QCoreApplication::arguments();
+    const int argumentCount = QCoreApplication::arguments().size();
+    const QStringList argumentList = QCoreApplication::arguments();
 
     QTextStream standardOutput(stdout);
 
     if (argumentCount == 1) {
-        standardOutput << QObject::tr("Usage: %1 <serialportname> [baudrate]").arg(argumentList.first()) << endl;
+        standardOutput << QObject::tr("Usage: %1 <serialportname> [baudrate]")
+                          .arg(argumentList.first()) << endl;
         return 1;
     }
 
     QSerialPort serialPort;
-    QString serialPortName = argumentList.at(1);
+    const QString serialPortName = argumentList.at(1);
     serialPort.setPortName(serialPortName);
 
-    int serialPortBaudRate = (argumentCount > 2) ? argumentList.at(2).toInt() : QSerialPort::Baud9600;
+    const int serialPortBaudRate = (argumentCount > 2)
+            ? argumentList.at(2).toInt() : QSerialPort::Baud9600;
     serialPort.setBaudRate(serialPortBaudRate);
 
     if (!serialPort.open(QIODevice::WriteOnly)) {
-        standardOutput << QObject::tr("Failed to open port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
+        standardOutput << QObject::tr("Failed to open port %1, error: %2")
+                          .arg(serialPortName).arg(serialPort.errorString())
+                       << endl;
         return 1;
     }
 
     QFile dataFile;
     if (!dataFile.open(stdin, QIODevice::ReadOnly)) {
-        standardOutput << QObject::tr("Failed to open stdin for reading") << endl;
+        standardOutput << QObject::tr("Failed to open stdin for reading")
+                       << endl;
         return 1;
     }
 
@@ -92,24 +94,32 @@ int main(int argc, char *argv[])
     dataFile.close();
 
     if (writeData.isEmpty()) {
-        standardOutput << QObject::tr("Either no data was currently available on the standard input for reading, or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
+        standardOutput << QObject::tr("Either no data was currently available on "
+                                      "the standard input for reading, or an error "
+                                      "occurred for port %1, error: %2")
+                          .arg(serialPortName).arg(serialPort.errorString()) << endl;
         return 1;
     }
 
-    qint64 bytesWritten = serialPort.write(writeData);
+    const qint64 bytesWritten = serialPort.write(writeData);
 
     if (bytesWritten == -1) {
-        standardOutput << QObject::tr("Failed to write the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
+        standardOutput << QObject::tr("Failed to write the data to port %1, error: %2")
+                          .arg(serialPortName).arg(serialPort.errorString()) << endl;
         return 1;
     } else if (bytesWritten != writeData.size()) {
-        standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
+        standardOutput << QObject::tr("Failed to write all the data to port %1, error: %2")
+                          .arg(serialPortName).arg(serialPort.errorString()) << endl;
         return 1;
     } else if (!serialPort.waitForBytesWritten(5000)) {
-        standardOutput << QObject::tr("Operation timed out or an error occurred for port %1, error: %2").arg(serialPortName).arg(serialPort.errorString()) << endl;
+        standardOutput << QObject::tr("Operation timed out or an error "
+                                      "occurred for port %1, error: %2")
+                          .arg(serialPortName).arg(serialPort.errorString()) << endl;
         return 1;
     }
 
-    standardOutput << QObject::tr("Data successfully sent to port %1").arg(serialPortName) << endl;
+    standardOutput << QObject::tr("Data successfully sent to port %1")
+                      .arg(serialPortName) << endl;
 
     return 0;
 }