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class TBaseSerialDevice : public QIODevice
{
...
public:
....
    virtual bool setBaudRate(TBaudRate baudRate=BaudRate9600) { parameters->m_baudRate=baudRate; return true; }
    bool setBaudRate(const QString &baudRate) { return setBaudRate(maps->baudRateMap.key(baudRate)); } //перегружаемая функция
....
private:
    MyType parameters; //упрощенно
    QMap<int, QString> baudRateMap; //упрощенно
}

class TWinSerialDevice : public TBaseSerialDevice
{
....
    bool setBaudRate(TBaudRate baudRate); {//тут уже другая реализация нежели в TBaseSerialDevice т.е я переопределяю эту виртуальную ф-ю }
....
}

/*
\en Test application to default parameters
\ru Тестовое приложение для параметров по умолчанию
*/

#include <QtCore>
#include <winserialdevice.h>

class TWinSerialDevice;

int main(int argc, char *argv[])
{
    QCoreApplication app(argc, argv);

    TWinSerialDevice *MyDevice;

    MyDevice = new TWinSerialDevice();

    qDebug() << "= Defaults parameters =" ;
    qDebug() << "Device name        	: " << MyDevice->deviceName() ;
    qDebug() << "Baud rate          	: " << MyDevice->baudRate() ;
    qDebug() << "Data bits          	: " << MyDevice->dataBits() ;
    qDebug() << "Parity             	: " << MyDevice->parity() ;
    qDebug() << "Stop bits          	: " << MyDevice->stopBits() ;
    qDebug() << "Flow               	: " << MyDevice->flowControl() ;
    qDebug() << "Char timeout, msec  	: " << MyDevice->charIntervalTimeout() ;
	//
    MyDevice->setDeviceName("COM1") ;
	
	MyDevice->open(QIODevice::ReadOnly | QIODevice::Unbuffered);
	QString br="115200 baud";
    MyDevice->setBaudRate(br) ;  //  <==== тут строка 32 
    MyDevice->setDataBits("7 bit") ;
    MyDevice->setParity("Even") ;
    MyDevice->setStopBits("2") ;
    MyDevice->setFlowControl("Hardware") ;
    MyDevice->setCharIntervalTimeout(100) ;	
	//
    qDebug() << "= New parameters =" ;
    qDebug() << "Device name        	: " << MyDevice->deviceName() ;
    qDebug() << "Baud rate          	: " << MyDevice->baudRate() ;
    qDebug() << "Data bits          	: " << MyDevice->dataBits() ;
    qDebug() << "Parity             	: " << MyDevice->parity() ;
    qDebug() << "Stop bits          	: " << MyDevice->stopBits() ;
    qDebug() << "Flow               	: " << MyDevice->flowControl() ;
    qDebug() << "Char timeout, msec  	: " << MyDevice->charIntervalTimeout() ;
	
	MyDevice->close();

    return app.exec();
}

class TWinSerialDevice : public TBaseSerialDevice
{
....
    bool setBaudRate(TBaudRate baudRate); {//тут уже другая реализация нежели в TBaseSerialDevice т.е я переопределяю эту виртуальную ф-ю }
....
}

class TBaseSerialDevice : public QIODevice
{
...
public:
....
    virtual bool setBaudRate(TBaudRate baudRate=BaudRate9600)
}

class TWinSerialDevice : public TBaseSerialDevice
{
....
    bool setBaudRate(TBaudRate baudRate); {//тут уже другая реализация нежели в TBaseSerialDevice т.е я переопределяю эту виртуальную ф-ю }
....
}

class TBaseSerialDevice : public QIODevice
{
...
public:
....
    virtual bool setBaudRate(TBaudRate baudRate=BaudRate9600)
}

class TWinSerialDevice : public TBaseSerialDevice
{
....
    virtual bool setBaudRate(TBaudRate baudRate=BaudRate9600)
....
}

Running build steps for project project...
Creating gdb macros library...
Starting: /usr/local/qtsdk-2009.01/qt/bin/qmake /home/bboy/Templates/111/QSerialDevice_11062009_1700/project.pro -spec linux-g++ -r 
Reading /home/bboy/Templates/111/QSerialDevice_11062009_1700/src/src.pro
Reading /home/bboy/Templates/111/QSerialDevice_11062009_1700/examples/reader/reader.pro
Reading /home/bboy/Templates/111/QSerialDevice_11062009_1700/examples/writer/writer.pro
Exited with code 0.
Starting: /usr/bin/make -w 
make: Entering directory `/home/bboy/Templates/111/QSerialDevice_11062009_1700'
cd src/ && /usr/bin/make -f Makefile
make[1]: Entering directory `/home/bboy/Templates/111/QSerialDevice_11062009_1700/src'
g++ -c -pipe -O2 -fPIC -D_REENTRANT -Wall -W -D_TTY_POSIX_ -DQT_NO_DEBUG -DQT_CORE_LIB -I/usr/local/qtsdk-2009.01/qt/mkspecs/linux-g++ -I. -I/usr/local/qtsdk-2009.01/qt/include/QtCore -I/usr/local/qtsdk-2009.01/qt/include -Ibuild/moc -o build/obj/posixserialdevice.o posixserialdevice.cpp
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::open(QFlags<QIODevice::OpenModeFlag>)’:
posixserialdevice.cpp:104: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:134: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘deviceName’
posixserialdevice.cpp:138: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:145: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:155: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:309: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:310: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:311: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘parity’
posixserialdevice.cpp:312: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:313: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘flowControl’
posixserialdevice.cpp:314: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘charIntervalTimeout’
posixserialdevice.cpp:317: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:323: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual void TPosixSerialDevice::close()’:
posixserialdevice.cpp:348: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:352: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setBaudRate(TBaseSerialDevice::TBaudRate)’:
posixserialdevice.cpp:403: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:406: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:409: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:413: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:420: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:423: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘baudRate’
posixserialdevice.cpp:562: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:568: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:572: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setDataBits(TBaseSerialDevice::TDataBits)’:
posixserialdevice.cpp:613: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:615: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:616: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:617: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘parity’
posixserialdevice.cpp:620: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:627: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:631: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:638: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:642: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:649: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:653: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:660: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:664: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:674: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:680: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:684: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setParity(TBaseSerialDevice::TParity)’:
posixserialdevice.cpp:727: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘parity’
posixserialdevice.cpp:728: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:731: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘parity’
posixserialdevice.cpp:738: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:743: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:745: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:749: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:753: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:782: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:788: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:792: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setStopBits(TBaseSerialDevice::TStopBits)’:
posixserialdevice.cpp:832: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:833: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:835: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:842: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:850: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘dataBits’
posixserialdevice.cpp:854: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘stopBits’
posixserialdevice.cpp:863: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:869: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:873: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setFlowControl(TBaseSerialDevice::TFlow)’:
posixserialdevice.cpp:908: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘flowControl’
posixserialdevice.cpp:909: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘flowControl’
posixserialdevice.cpp:933: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:939: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:943: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setCharIntervalTimeout(int)’:
posixserialdevice.cpp:961: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘charIntervalTimeout’
posixserialdevice.cpp:965: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:972: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:978: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘qint64 TPosixSerialDevice::bytesAvailable()’:
posixserialdevice.cpp:1004: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1010: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setDtr(bool)’:
posixserialdevice.cpp:1036: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1047: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1053: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::setRts(bool)’:
posixserialdevice.cpp:1079: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1090: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1096: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual ulong TPosixSerialDevice::lineStatus()’:
posixserialdevice.cpp:1133: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1162: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::waitForReadyRead(int, bool)’:
posixserialdevice.cpp:1223: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1235: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1246: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1250: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual bool TPosixSerialDevice::waitForBytesWritten(int)’:
posixserialdevice.cpp:1306: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1316: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1324: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1328: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp: In member function ‘virtual qint64 TPosixSerialDevice::readData(char*, qint64)’:
posixserialdevice.cpp:1362: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1378: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1387: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1394: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1401: error: ‘class TBaseSerialDevice::TSerialSettings’ has no member named ‘charIntervalTimeout’
posixserialdevice.cpp: In member function ‘virtual qint64 TPosixSerialDevice::writeData(const char*, qint64)’:
posixserialdevice.cpp:1433: error: ‘errors’ was not declared in this scope
posixserialdevice.cpp:1439: error: ‘errors’ was not declared in this scope
make[1]: Leaving directory `/home/bboy/Templates/111/QSerialDevice_11062009_1700/src'
make[1]: *** [build/obj/posixserialdevice.o] Error 1
make: Leaving directory `/home/bboy/Templates/111/QSerialDevice_11062009_1700'
make: *** [sub-src-make_default-ordered] Error 2
Exited with code 2.
Error while building project project
When executing build step 'Make'

...
virtual bool setBaudRate(TBaudRate baudRate=BaudRate9600)
...

...
virtual bool m_setBaudRate(TBaudRate baudRate=BaudRate9600)
...