Fixed logs from another thread

Author: bbogush

qt/logger.cpp

@@ -6,6 +6,7 @@
 #include "logger.h"
 #include <QDebug>
 #include <QScrollBar>
+#include <QObject>
 
 Logger *Logger::logger;
 QTextEdit *Logger::logTextEdit;
@@ -53,12 +54,12 @@ void Logger::logHandler(QtMsgType type, const QMessageLogContext &context ,
 
         logTextEdit->verticalScrollBar()->
             setValue(logTextEdit->verticalScrollBar()->maximum());
-
     }
 }
 
 Logger::Logger()
 {
+    QObject::connect(this, SIGNAL(log(QString)), this, SLOT(slotLog(QString)));
     qInstallMessageHandler(logHandler);
     oldBuf = std::cerr.rdbuf();
     std::cerr.rdbuf(this);
@@ -102,16 +103,21 @@ void Logger::setTextEdit(QTextEdit *textEdit)
 
 std::basic_streambuf<char>::int_type Logger::overflow(int_type v)
 {
-    qCritical() << tempBuf;
+    emit log(tempBuf);
     tempBuf.clear();
 
     return v;
 }
 
 std::streamsize Logger::xsputn(const char *p, std::streamsize n)
 {
-    tempBuf.append(p);
+    tempBuf.append(QString::fromLatin1(p, n));
 
     return n;
 }
 
+void Logger::slotLog(QString msg)
+{
+    qCritical() << msg;
+}
+

qt/logger.h

@@ -10,13 +10,16 @@
 #include <iostream>
 #include <streambuf>
 
-class Logger: public std::basic_streambuf<char>
+class Logger: public QObject, public std::basic_streambuf<char>
 {
+    Q_OBJECT
+
+private:
     static QTextEdit *logTextEdit;
     static Logger *logger;
     static int refCount;
-    std::streambuf *oldBuf;
-    QString tempBuf;
+    std::streambuf *oldBuf = nullptr;
+    QString tempBuf = "";
 
     explicit Logger();
     ~Logger();
@@ -28,10 +31,16 @@ class Logger: public std::basic_streambuf<char>
     virtual std::basic_streambuf<char>::int_type overflow(int_type v) override;
     virtual std::streamsize xsputn(const char *p, std::streamsize n) override;
 
+private slots:
+    void slotLog(QString msg);
+
 public:
     static Logger *getInstance();
     static void putInstance();
     static void setTextEdit(QTextEdit *textEdit);
+
+signals:
+    void log(QString msg);
 };
 
 #endif // LOGGER_H