错误 21 错误 LNK2019:未解析的外部符号:..在函数中引用:...
Error 21 error LNK2019: unresolved external symbol:.... referenced in function:....
我试图创建一个从.cpp开始的.h文件。我很确定标题是正确的，但是当我尝试在我的另一个项目中使用 .cpp 文件的功能时，我遇到了很多链接问题。所以我在这里附上了文件，肯定有人可以给我一些解决方案。检查项目属性的第一个解决方案，属性>链接器>附加库，我已经完成了。
有.cpp文件：
IfacomAmqSender.cpp
#include <activemq/library/ActiveMQCPP.h>
#include <decaf/lang/Thread.h>
#include <decaf/lang/Runnable.h>
#include <decaf/util/concurrent/CountDownLatch.h>
#include <decaf/lang/Integer.h>
#include <decaf/lang/Long.h>
#include <decaf/lang/System.h>
#include <activemq/core/ActiveMQConnectionFactory.h>
#include <activemq/util/Config.h>
#include <cms/Connection.h>
#include <cms/Session.h>
#include <cms/TextMessage.h>
#include <cms/BytesMessage.h>
#include <cms/MapMessage.h>
#include <cms/ExceptionListener.h>
#include <cms/MessageListener.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <memory>
using namespace activemq::core;
using namespace decaf::util::concurrent;
using namespace decaf::util;
using namespace decaf::lang;
using namespace cms;
using namespace std;
class IfacomAmqSender : public ExceptionListener{
private:
CountDownLatch m_latch;
CountDownLatch m_doneLatch;
Connection* m_connection;
Session* m_session;
Destination* m_destination;
MessageConsumer* m_consumer;
MessageProducer* m_producer;
std::auto_ptr<TextMessage> m_message;
long m_waitMillis;
bool m_useTopic;
bool m_sessionTransacted;
std::string m_brokerURI;
std::string m_destName;
DeliveryMode m_message_delivery_mode;
int m_message_priority;
private:
//IfacomAmqSender(const IfacomAmqSender&);
//IfacomAmqSender& operator=(const IfacomAmqSender&);
public:
IfacomAmqSender(const std::string& brokerURI, int numMessages, bool useTopic = false, bool sessionTransacted = false, const std::string& destName = "IFACOM-CMS", int waitMillis = 1000) :
m_latch(1),
m_doneLatch(numMessages),
m_connection(NULL),
m_session(NULL),
m_destination(NULL),
m_consumer(NULL),
m_waitMillis(waitMillis),
m_useTopic(useTopic),
m_sessionTransacted(sessionTransacted),
m_destName(destName),
m_brokerURI(brokerURI) {
}
IfacomAmqSender(const std::string& brokerURI, bool useTopic = false, bool sessionTransacted = false, const std::string& destName = "IFACOM-CMS") :
m_latch(1),
m_doneLatch(1),
m_connection(NULL),
m_session(NULL),
m_destination(NULL),
m_consumer(NULL),
m_waitMillis(1000),
m_useTopic(useTopic),
m_sessionTransacted(sessionTransacted),
m_destName(destName),
m_brokerURI(brokerURI) {
}
virtual ~IfacomAmqSender() {
cleanup();
}
void close() {
this->cleanup();
}
void waitUntilReady() {
m_latch.await();
}
//------ Init connexion ---------------
void createConnection()
{
// Create a ConnectionFactory
auto_ptr<ConnectionFactory> connectionFactory(ConnectionFactory::createCMSConnectionFactory(m_brokerURI));
// Create a Connection
m_connection = connectionFactory->createConnection();
m_connection->start();
m_connection->setExceptionListener(this);
}
void createSession()
{
// Create a Session
if (this->m_sessionTransacted == true) {
m_session = m_connection->createSession(Session::SESSION_TRANSACTED);
} else {
m_session = m_connection->createSession(Session::AUTO_ACKNOWLEDGE);
}
}
void createDestination()
{
// Create the destination (Topic or Queue)
if (m_useTopic) {
m_destination = m_session->createTopic(m_destName);
} else {
m_destination = m_session->createQueue(m_destName);
}
}
void createProducer()
{
m_producer = m_session->createProducer(m_destination);
m_producer->setDeliveryMode(DeliveryMode::NON_PERSISTENT);
}
void initConnection() {
try {
createConnection();
// Create the session
createSession();
// Create the destination (Topic or Queue)
createDestination();
// Create a MessageProducer from the Session to the Topic or Queue
createProducer();
m_producer->setDeliveryMode(DeliveryMode::NON_PERSISTENT);
// Indicate we are ready for messages.
m_latch.countDown();
// Wait while asynchronous messages come in.
m_doneLatch.await(m_waitMillis);
} catch (CMSException& e) {
// Indicate we are ready for messages.
//latch.countDown();
e.printStackTrace();
}
}
virtual void sendMessage(string text) {
try {
std::auto_ptr<TextMessage> message(m_session->createTextMessage(text));
// to set a property
////message->setIntProperty("Integer", ix);
m_producer->send(message.get());
message->setCMSTimestamp(System::currentTimeMillis());
} catch (CMSException& e) {
e.printStackTrace();
}
}
// Send a ActiveMQ Message
virtual void sendMessage(std::auto_ptr<TextMessage> amq_message) {
try {
amq_message->setCMSTimestamp(System::currentTimeMillis());
m_producer->send(amq_message.get());
} catch (CMSException& e) {
e.printStackTrace();
}
}
//--------------------------------------------------
// If something bad happens you see it here as this class is also been
// registered as an ExceptionListener with the connection.
virtual void onException(const CMSException& ex AMQCPP_UNUSED) {
printf("CMS Exception occurred. Shutting down client.n");
ex.printStackTrace();
exit(1);
}
// Message Priority (0:Lowest - 9:Highest)
void setPriority(int priority){m_message_priority = priority;}
int getPriority(){return m_message_priority;}
// Message Delivery Mode
void setDeliveryMode(DeliveryMode delivery_mode){m_message_delivery_mode = delivery_mode;}
DeliveryMode getDeliveryMode(){return m_message_delivery_mode;}
Session* getSession()
{
return m_session;
}
private:
void cleanup() {
if (m_connection != NULL) {
try {
m_connection->close();
} catch (cms::CMSException& ex) {
ex.printStackTrace();
}
}
// Destroy resources.
try {
delete m_destination;
m_destination = NULL;
delete m_consumer;
m_consumer = NULL;
delete m_session;
m_session = NULL;
delete m_connection;
m_connection = NULL;
} catch (CMSException& e) {
e.printStackTrace();
}
}
};
主窗口.cpp文件：
#include "mainwindow.h"
#include "ui_mainwindow.h"
#include "IfacomAmqSender.h"
#include <activemq/library/ActiveMQCPP.h>
#include <decaf/lang/Thread.h>
#include <decaf/lang/Runnable.h>
#include <decaf/util/concurrent/CountDownLatch.h>
#include <decaf/lang/Integer.h>
#include <decaf/lang/Long.h>
#include <decaf/lang/System.h>
#include <activemq/core/ActiveMQConnectionFactory.h>
#include <activemq/util/Config.h>
#include <cms/Connection.h>
#include <cms/Session.h>
#include <cms/TextMessage.h>
#include <cms/BytesMessage.h>
#include <cms/MapMessage.h>
#include <cms/ExceptionListener.h>
#include <cms/MessageListener.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <memory>
#include <qstring.h>
#include <QTextStream>
#include <QMessageBox>
using namespace activemq::core;
using namespace decaf::util::concurrent;
using namespace decaf::util;
using namespace decaf::lang;
using namespace cms;
using namespace std;
MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);
}
MainWindow::~MainWindow()
{
delete ui;
}
void MainWindow::on_pushButton_clicked()
{
activemq::library::ActiveMQCPP::initializeLibrary();
{
std::string brokerURI;
brokerURI = "failover://(tcp://localhost:61613?wireFormat=stomp)"; // localhost
// brokerURI = "failover://(tcp://localhost:61616)"; // localhost
// Queue name
std::string destName = "IFACOM-CMS";
// Queue or Topic
bool useTopics = false; // true=Topic, false=Queue
// SESSION_TRANSACTED or AUTO_ACKNOWLEDGE
bool sessionTransacted = false; // if true, commit all messages
long long startTime = System::currentTimeMillis();
// ***** Initialisation **************************************************************
IfacomAmqSender IfacomMessageBroker(brokerURI, useTopics, sessionTransacted, destName);
IfacomMessageBroker.initConnection();
//****** Send message ******************************************************
std::string text = "My IFaCOM message";
// Customized message
try{
std::auto_ptr<TextMessage> message(IfacomMessageBroker.getSession()->createTextMessage(text));
message->setCMSTimestamp(System::currentTimeMillis());
message->setStringProperty("MyProperty", "test");
IfacomMessageBroker.sendMessage(message);
} catch (CMSException& e) {
e.printStackTrace();
}
// Simple text message
IfacomMessageBroker.sendMessage(text);
long long endTime = System::currentTimeMillis();
double totalTime = (double)(endTime - startTime) / 1000.0;
// Close the connection
IfacomMessageBroker.close();
ui->label->setText(QString::fromStdString(text));
}
// To Do at the end
activemq::library::ActiveMQCPP::shutdownLibrary();
}
主.cpp文件：
#include "ifacomamqsender.h"
#include "mainwindow.h"
#include <QApplication>
int main(int argc, char *argv[])
{
QApplication a(argc, argv);
MainWindow w;
w.show();
return a.exec();
}
有头文件：
IfacomAmqSender.h 文件：
#ifndef _IfacomAmqSender_h
#define _IfacomAmqSender_h
#include <activemq/library/ActiveMQCPP.h>
#include <decaf/lang/Thread.h>
#include <decaf/lang/Runnable.h>
#include <decaf/util/concurrent/CountDownLatch.h>
#include <decaf/lang/Integer.h>
#include <decaf/lang/Long.h>
#include <decaf/lang/System.h>
#include <activemq/core/ActiveMQConnectionFactory.h>
#include <activemq/util/Config.h>
#include <cms/Connection.h>
#include <cms/Session.h>
#include <cms/TextMessage.h>
#include <cms/BytesMessage.h>
#include <cms/MapMessage.h>
#include <cms/ExceptionListener.h>
#include <cms/MessageListener.h>
#include <stdlib.h>
#include <stdio.h>
#include <iostream>
#include <memory>
using namespace activemq::core;
using namespace decaf::util::concurrent;
using namespace decaf::util;
using namespace decaf::lang;
using namespace cms;
using namespace std;
class IfacomAmqSender{
private:
CountDownLatch m_latch;
CountDownLatch m_doneLatch;
Connection* m_connection;
Session* m_session;
Destination* m_destination;
MessageConsumer* m_consumer;
MessageProducer* m_producer;
std::auto_ptr<TextMessage> m_message;
long m_waitMillis;
bool m_useTopic;
bool m_sessionTransacted;
std::string m_brokerURI;
std::string m_destName;
DeliveryMode m_message_delivery_mode;
int m_message_priority;
IfacomAmqSender(const IfacomAmqSender&);
IfacomAmqSender& operator=(const IfacomAmqSender&);
public:
IfacomAmqSender(const std::string&, int, bool, bool, const std::string&, int);
IfacomAmqSender(const std::string&, bool, bool, const std::string&);
virtual ~IfacomAmqSender();
void close();
void waitUntilReady();
void cleanup();
// KH
void createConnection();
void createSession();
void createDestination();
void createProducer();
void initConnection();
virtual void sendMessage(string);
// Send a ActiveMQ Message
virtual void sendMessage(std::auto_ptr<TextMessage>);
//--------------------------------------------------
// If something bad happens you see it here as this class is also been
// registered as an ExceptionListener with the connection.
virtual void onException(const CMSException&) ;
// Message Priority (0:Lowest - 9:Highest)
void setPriority(int);
int getPriority();
// Message Delivery Mode
void setDeliveryMode(DeliveryMode);
DeliveryMode getDeliveryMode();
Session* getSession();
};
#endif
主窗口.h 文件：
#ifndef MAINWINDOW_H
#define MAINWINDOW_H
#include <QMainWindow>
namespace Ui {
class MainWindow;
}
class MainWindow : public QMainWindow
{
Q_OBJECT
public:
explicit MainWindow(QWidget *parent = 0);
~MainWindow();
private slots:
void on_pushButton_clicked();
private:
Ui::MainWindow *ui;
};
#endif // MAINWINDOW_H
错误是：
Error 21 error LNK2019: unresolved external symbol "public: __thiscall IfacomAmqSender::IfacomAmqSender(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &,bool,bool,class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > const &)" (??0IfacomAmqSender@@QAE@ABV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@_N10@Z) referenced in function "private: void __thiscall MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AAEXXZ) C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 22 error LNK2019: unresolved external symbol "public: virtual __thiscall IfacomAmqSender::~IfacomAmqSender(void)" (??1IfacomAmqSender@@UAE@XZ) referenced in function __catch$?on_pushButton_clicked@MainWindow@@AAEXXZ$0 C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 23 error LNK2019: unresolved external symbol "public: void __thiscall IfacomAmqSender::close(void)" (?close@IfacomAmqSender@@QAEXXZ) referenced in function __catch$?on_pushButton_clicked@MainWindow@@AAEXXZ$0 C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 24 error LNK2019: unresolved external symbol "public: void __thiscall IfacomAmqSender::initConnection(void)" (?initConnection@IfacomAmqSender@@QAEXXZ) referenced in function "private: void __thiscall MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AAEXXZ) C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 25 error LNK2019: unresolved external symbol "public: virtual void __thiscall IfacomAmqSender::sendMessage(class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> >)" (?sendMessage@IfacomAmqSender@@UAEXV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@Z) referenced in function __catch$?on_pushButton_clicked@MainWindow@@AAEXXZ$0 C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 26 error LNK2019: unresolved external symbol "public: virtual void __thiscall IfacomAmqSender::sendMessage(class std::auto_ptr<class cms::TextMessage>)" (?sendMessage@IfacomAmqSender@@UAEXV?$auto_ptr@VTextMessage@cms@@@std@@@Z) referenced in function "private: void __thiscall MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AAEXXZ) C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 27 error LNK2019: unresolved external symbol "public: class cms::Session * __thiscall IfacomAmqSender::getSession(void)" (?getSession@IfacomAmqSender@@QAEPAVSession@cms@@XZ) referenced in function "private: void __thiscall MainWindow::on_pushButton_clicked(void)" (?on_pushButton_clicked@MainWindow@@AAEXXZ) C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSmainwindow.obj GUI-CMS
Error 28 error LNK1120: 7 unresolved externals C:UsersMarcoDesktopActivemqReleaseVersionsGUI-CMSdebug\GUI-CMS.exe GUI-CMS
我不明白你的代码。 它对IfacomAmqSender类有两种不同的定义。第一个是
class IfacomAmqSender : public ExceptionListener{
第二个是
class IfacomAmqSender{
我认为错误的原因是这些重复的类IfacomAmqSender
您的IfacomAmqSender构造函数声明如下：
IfacomAmqSender(const std::string&, int, bool, bool, const std::string&, int);
实现标头如下所示：
IfacomAmqSender(const std::string& brokerURI, int numMessages, bool useTopic = false, bool sessionTransacted = false, const std::string& destName = "IFACOM-CMS", int waitMillis = 1000);
因此，您的实现声明标准参数值，而声明则不声明。因此，在任何调用的位置，已知该函数可以采用标准参数是相当随机的。要么删除所有标准参数，要么确保在声明和实现中在任何地方都声明它们相同。（我的C++有点生锈，我认为它的主要位置是 .h 文件中的声明）。
哦，是的，是的：看到另一个答案。实现周围有另一个类标头。因此，您实际上是在声明两个具有相同名称的类。CPP文件中通常没有任何class X : public Y声明。
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