QT4.4 TcpSocket例程Debug

C++ GUI Qt4 Programming (Second Edition)

Chapter 15:Network

书中例程下载自QT中文论坛：

http://www.qtcn.org/bbs/read.php?tid=10375

对于15章的例程，在编译tripplanner和tripserver这两个文件时，用如下命令：

$cd tripplanner $/usr/lib/qt4/bin/qmake -project $/usr/lib/qt4/bin/qmake $make

然后出现如下错误:

g++ -o tripplanner main.o tripplanner.o moc_tripplanner.o -lQtGui -lQtCore -lpthread main.o: In function `~TripPlanner': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.h:12: undefined reference to `QTcpSocket::~QTcpSocket()' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.h:12: undefined reference to `QTcpSocket::~QTcpSocket()' tripplanner.o: In function `TripPlanner::closeConnection()': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:152: undefined reference to `QAbstractSocket::close()' tripplanner.o: In function `TripPlanner::updateTableWidget()': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:101: undefined reference to `QAbstractSocket::bytesAvailable() const' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:90: undefined reference to `QAbstractSocket::bytesAvailable() const' tripplanner.o: In function `TripPlanner::connectToServer()': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:46: undefined reference to `QHostAddress::QHostAddress(QHostAddress::SpecialAddress)' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:46: undefined reference to `QAbstractSocket::connectToHost(QHostAddress const&, unsigned short, QFlags<QIODevice::OpenModeFlag>)' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:46: undefined reference to `QHostAddress::~QHostAddress()' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:46: undefined reference to `QHostAddress::~QHostAddress()' tripplanner.o: In function `TripPlanner': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:7: undefined reference to `QTcpSocket::QTcpSocket(QObject*)' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:41: undefined reference to `QTcpSocket::~QTcpSocket()' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:7: undefined reference to `QTcpSocket::QTcpSocket(QObject*)' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.cpp:41: undefined reference to `QTcpSocket::~QTcpSocket()' moc_tripplanner.o: In function `~TripPlanner': /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.h:12: undefined reference to `QTcpSocket::~QTcpSocket()' /home/ysong/Templates/QT/qt-book/chap15/tripplanner/tripplanner.h:12: undefined reference to `QTcpSocket::~QTcpSocket()' collect2: ld Return 1 make: *** [tripplanner] Error 1

进入tripserver目录，编译：

$cd tripserver $/usr/lib/qt4/bin/qmake -project $/usr/lib/qt4/bin/qmake $make

出现如下错误：

g++ -o tripserver clientsocket.o main.o tripserver.o moc_clientsocket.o moc_tripserver.o -lQtGui -lQtCore -lpthread clientsocket.o: In function `ClientSocket': /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.cpp:6: undefined reference to QTcpSocket::QTcpSocket(QObject*)' /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.cpp:12: undefined reference to `QTcpSocket::~QTcpSocket()' /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.cpp:6: undefined reference to QTcpSocket::QTcpSocket(QObject*)' /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.cpp:12: undefined reference to `QTcpSocket::~QTcpSocket()' main.o: In function `main': /home/ysong/Templates/QT/qt-book/chap15/tripserver/main.cpp:10: undefined reference to `QHostAddress::QHostAddress(QHostAddress::SpecialAddress)' /home/ysong/Templates/QT/qt-book/chap15/tripserver/main.cpp:10: undefined reference to `QTcpServer::listen(QHostAddress const&, unsigned short)' /home/ysong/Templates/QT/qt-book/chap15/tripserver/main.cpp:10: undefined reference to `QHostAddress::~QHostAddress()' main.o: In function `~TripServer': /home/ysong/Templates/QT/qt-book/chap15/tripserver/main.cpp:20: undefined reference to `QTcpServer::~QTcpServer()' main.o: In function `~TripServer': /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.h:7: undefined reference to `QTcpServer::~QTcpServer()' main.o: In function `main': /home/ysong/Templates/QT/qt-book/chap15/tripserver/main.cpp:10: undefined reference to `QHostAddress::~QHostAddress()' tripserver.o: In function `TripServer::incomingConnection(int)': /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.cpp:14: undefined reference to `QAbstractSocket::setSocketDescriptor(int, QAbstractSocket::SocketState, QFlags<QIODevice::OpenModeFlag>)' tripserver.o: In function `TripServer': /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.cpp:7: undefined reference to `QTcpServer::QTcpServer(QObject*)' /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.cpp:7: undefined reference to `QTcpServer::QTcpServer(QObject*)' moc_clientsocket.o: In function 'ClientSocket::qt_metacall(QMetaObject::Call, int, void**)': /home/ysong/Templates/QT/qt-book/chap15/tripserver/moc_clientsocket.cpp:60: undefined reference to `QTcpSocket::qt_metacall(QMetaObject::Call, int, void**)' moc_clientsocket.o: In function `ClientSocket::qt_metacast(char const*)': /home/ysong/Templates/QT/qt-book/chap15/tripserver/moc_clientsocket.cpp:55: undefined reference to `QTcpSocket::qt_metacast(char const*)' moc_clientsocket.o: In function `~ClientSocket': /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.h:10: undefined reference to `QTcpSocket::~QTcpSocket()' /home/ysong/Templates/QT/qt-book/chap15/tripserver/clientsocket.h:10: undefined reference to `QTcpSocket::~QTcpSocket()' moc_clientsocket.o:(.rodata+0x0): undefined reference to `QTcpSocket::staticMetaObject' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x38): undefined reference to `QAbstractSocket::isSequential() const' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x40): undefined reference to `QAbstractSocket::close()' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x50): undefined reference to `QAbstractSocket::atEnd() const' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x58): undefined reference to `QAbstractSocket::bytesAvailable() const' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x5c): undefined reference to `QAbstractSocket::bytesToWrite() const' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x60): undefined reference to `QAbstractSocket::canReadLine() const' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x64): undefined reference to `QAbstractSocket::waitForReadyRead(int)' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x68): undefined reference to `QAbstractSocket::waitForBytesWritten(int)' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x6c): undefined reference to `QAbstractSocket::readData(char*, long long)' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x70): undefined reference to `QAbstractSocket::readLineData(char*, long long)' moc_clientsocket.o:(.rodata._ZTV12ClientSocket[vtable for ClientSocket]+0x74): undefined reference to `QAbstractSocket::writeData(char const*, long long)' moc_clientsocket.o:(.rodata._ZTI12ClientSocket[typeinfo for ClientSocket]+0x8): undefined reference to `typeinfo for QTcpSocket' moc_tripserver.o: In function `TripServer::qt_metacall(QMetaObject::Call, int, void**)': /home/ysong/Templates/QT/qt-book/chap15/tripserver/moc_tripserver.cpp:57: undefined reference to `QTcpServer::qt_metacall(QMetaObject::Call, int, void**)' moc_tripserver.o: In function `TripServer::qt_metacast(char const*)': /home/ysong/Templates/QT/qt-book/chap15/tripserver/moc_tripserver.cpp:52: undefined reference to `QTcpServer::qt_metacast(char const*)' moc_tripserver.o: In function `~TripServer': /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.h:7: undefined reference to `QTcpServer::~QTcpServer()' /home/ysong/Templates/QT/qt-book/chap15/tripserver/tripserver.h:7: undefined reference to `QTcpServer::~QTcpServer()' moc_tripserver.o:(.rodata+0x0): undefined reference to `QTcpServer::staticMetaObject' moc_tripserver.o:(.rodata._ZTV10TripServer[vtable for TripServer]+0x38): undefined reference to `QTcpServer::hasPendingConnections() const' moc_tripserver.o:(.rodata._ZTV10TripServer[vtable for TripServer]+0x3c): undefined reference to `QTcpServer::nextPendingConnection()' moc_tripserver.o:(.rodata._ZTI10TripServer[typeinfo for TripServer]+0x8): undefined reference to `typeinfo for QTcpServer' collect2: ld 返回 1 make: *** [tripserver] 错误 1

解决办法就是在各pro文件中加入QT += network

完整的tripserver.pro内容如下：

TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . QT += network # Input HEADERS += clientsocket.h tripserver.h SOURCES += clientsocket.cpp main.cpp tripserver.cpp

tripplanner.pro内容如下：

TEMPLATE = app TARGET = DEPENDPATH += . INCLUDEPATH += . QT += network # Input HEADERS += tripplanner.h FORMS += tripplanner.ui SOURCES += main.cpp tripplanner.cpp

这样再运行make命令编译即可通过：

得到

 如果在编译tripserver时出现如下关于rand和srand函数调用的错误:

 clientsocket.cpp: In member function ‘void ClientSocket::readClient()’: clientsocket.cpp:22: warning: comparison between signed and unsigned integer expressions clientsocket.cpp:41: error: ‘srand’ is not a member of ‘std’ clientsocket.cpp:43: error: ‘rand’ is not a member of ‘std’ clientsocket.cpp: In member function ‘void ClientSocket::generateRandomTrip(const QString&, const QString&, const QDate&, const QTime&)’: clientsocket.cpp:60: error: ‘rand’ is not a member of ‘std’ make: *** [clientsocket.o] Error 1

则在clientsocket.cpp中加入头文件：

#include <cstdlib>

 

参考：

problem compiling with qtopia core 4.2.2