我有一个日志文件,该文件在运行时会更新。我想要文本浏览器中显示的文本内容,并且应该动态更新。
.h文件
public:
void fillloginfo();
void initializeQTimer();
void closeEvent(QCloseEvent *event);
void fillLogInfoChronically(const QString& logFilePath);
private:
QTimer* m_Timer;
QString m_logFilePath;
std::ifstream m_logFileStream;
public slots:
void fillLogInfoChronicallySlot();
.cpp文件
void logdialog::initializeQTimer(){
m_Timer = NULL;
//create the timer object
m_Timer = new QTimer(this);
QObject::connect(m_Timer,SIGNAL(timeout()), this,SLOT(fillLogInfoChronicallySlot()));
}
void logdialog::closeEvent(QCloseEvent *event)
{
m_Timer->stop();
if ( m_logFileStream.is_open()){
m_logFileStream.close();
}
}
void logdialog::fillLogInfoChronically(const QString &logFilePath)
{
uilog->textBrowser->clear();
m_LastLinePos = 0;
m_logFilePath = logFilePath;
std::string m_logFilePathStr= m_logFilePath.toStdString();
m_logFileStream.open(m_logFilePathStr.c_str());
if (m_logFileStream.is_open()){
fillloginfo();
m_Timer->start(1000);
}
}
void logdialog::fillloginfo()
{
std::string line;
while (getline(m_logFileStream,line)){
uilog->textBrowser->append(QString::fromStdString(line));
}
}
void logdialog::fillLogInfoChronicallySlot()
{
fillloginfo();
}
因此,我只能在第一个呼叫上读取文件,其余的呼叫以获取文件的更新不起作用。
预先感谢
您需要在初始读取后在输入流中调用std::ios::clear()
。当您读取整个文件时,它将在流中设置failbit
并拒绝继续读取,即使文件在此期间发生了变化。
在您的情况下,您必须再次阅读之前:
void logdialog::fillloginfo()
{
std::string line;
m_logFileStream.clear();
while (getline(m_logFileStream,line)){
uilog->textBrowser->append(QString::fromStdString(line));
}
}
完整的代码在以下链接中