qt 一个变量声明引用 undefined reference to

fengyoujie 2013-01-09 01:30:12

诸位老师好！
有一个问题：IDE是qtCreator。我定义了一个类LogUtil，头文件如下LogUtil.h。



#ifndef LOGUTIL_H

#define LOGUTIL_H

#include <QDir>

#include "QsLog.h"



class LogUtil: public QObject

{

    Q_OBJECT

    public:        

        static QString getCurrentLogName(){return currentLogFileName ;}

        static void setCurrentLogName(QString fileName);

        static void createLogFile(QString fileName);

        static int getLogSize(QString fileName);

        static void log(QString dateTime,QString eventStatus,QString logMsg,QString connectDevice,QString DeviceIp,QString remark);

        

    private:

        LogUtil(){}

        static QString currentLogFileName;

};



#endif // LOGUTIL_H

源文件LogUtil.cpp



   #include <QObject>

#include "LogUtil.h"

#include "QsLog.h"

#include "QsLogDest.h"



void LogUtil::setCurrentLogName(QString fileName)

{

    LogUtil::currentLogFileName = fileName ;

}



int LogUtil::getLogSize(QString fileName){

    int size = 0;

    QFile file(fileName);



    if (!file.open(QIODevice::ReadOnly))

    {

        return 1;

    }



    size = file.size();

    file.close();

    return size;

}



void LogUtil::createLogFile(QString fileName)

{

    QsLogging::Logger& logger = QsLogging::Logger::instance();

    logger.setLoggingLevel(QsLogging::TraceLevel);

    //const QString sLogPath(QDir(Settings::SavePath()).path()+"/log/"+fileName);

    QString dirPath = "e:/upload";

    const QString sLogPath(QDir(dirPath.append("/log/")).path()+fileName);

    QsLogging::DestinationPtr fileDestination( QsLogging::DestinationFactory::MakeFileDestination(sLogPath) );

    QsLogging::DestinationPtr debugDestination(QsLogging::DestinationFactory::MakeDebugOutputDestination() );

    logger.addDestination(debugDestination.get());

    logger.addDestination(fileDestination.get());



    QString currentFileName = "e:/upload";

    currentFileName.append("/log/").append(fileName);

    setCurrentLogName(currentFileName);

}



void LogUtil::log(QString dateTime, QString eventStatus, QString logMsg, QString connectDevice, QString DeviceIp, QString remark)

{

    QLOG_INFO()<<" dateTime:" +dateTime +" eventStatus: " +eventStatus+" LogMsg: "+logMsg+" connentDevice: "+connectDevice+" DeviceIp: "+DeviceIp+" remark:"+remark;

}

编译的时候报如下错误：

release/moc_LogUtil.o -L"c:\QtSDK\Desktop\Qt\4.7.4\mingw\lib" -lQtCore4
release/LogUtil.o:LogUtil.cpp:(.text+0x9c): undefined reference to `LogUtil::currentLogFileName'
collect2: ld returned 1 exit status
mingw32-make.exe[1]: Leaving directory `C:/Users/youjie/Desktop/log_example-build-desktop-Qt_4_7_4_for_Desktop_-_MinGW_4_4__Qt_SDK____'
mingw32-make.exe[1]: *** [release\log_example.exe] Error 1
mingw32-make.exe: *** [release] Error 2
12:35:58: 进程"C:\QtSDK\mingw\bin\mingw32-make.exe"退出，退出代码 2 。
构建项目log_example 时发生错误 (目标: 桌面)
当执行构建步骤 'Make'时

不知何故，请诸位老师指点，多谢了。

...全文