diff --git a/DSView/pv/data/decode/annotation.cpp b/DSView/pv/data/decode/annotation.cpp
index ee7e2cc7..50741629 100755
--- a/DSView/pv/data/decode/annotation.cpp
+++ b/DSView/pv/data/decode/annotation.cpp
@@ -147,7 +147,7 @@ const std::vector<QString>& Annotation::annotations() const
 				 char sz_format_tmp_buf[50] = {0};
 				 QString src = rd_src.replace("{$}", "%s");
 				 const char *num_str = _status->m_resTable.format_numberic(resItem.str_number_hex, resItem.cur_display_format);
-				 sprintf(sz_format_tmp_buf, src.toLatin1().data(), num_str);
+				 sprintf(sz_format_tmp_buf, src.toUtf8().data(), num_str);
 				 resItem.cvt_lines.push_back(QString(sz_format_tmp_buf));
 			 }
 		 }
diff --git a/DSView/pv/data/decoderstack.cpp b/DSView/pv/data/decoderstack.cpp
index e68b111a..6c049109 100755
--- a/DSView/pv/data/decoderstack.cpp
+++ b/DSView/pv/data/decoderstack.cpp
@@ -344,11 +344,6 @@ bool DecoderStack::list_row_title(int row, QString &title)
     return 0;
 }
 
-QString DecoderStack::error_message()
-{ 
-	return _error_message;
-}
-
 void DecoderStack::clear()
 {
     init();
diff --git a/DSView/pv/data/decoderstack.h b/DSView/pv/data/decoderstack.h
index fab50833..a1465ac2 100755
--- a/DSView/pv/data/decoderstack.h
+++ b/DSView/pv/data/decoderstack.h
@@ -126,7 +126,7 @@ public:
 
 
     bool list_row_title(int row, QString &title);
-	QString error_message();
+	 
 	void clear();
     void init();
 	uint64_t get_max_sample_count();
@@ -149,6 +149,10 @@ public:
     int64_t get_mark_index();
     void frame_ended();
 
+    inline QString error_message(){ 
+	    return _error_message;
+    }
+
 private:
     void decode_data(const uint64_t decode_start, const uint64_t decode_end, srd_session *const session);
 	void decode_proc();
diff --git a/DSView/pv/dock/protocoldock.cpp b/DSView/pv/dock/protocoldock.cpp
index 2be0a286..80d1fed0 100755
--- a/DSView/pv/dock/protocoldock.cpp
+++ b/DSView/pv/dock/protocoldock.cpp
@@ -124,7 +124,7 @@ ProtocolDock::ProtocolDock(QWidget *parent, view::View &view, SigSession *sessio
     if (repeatNammes != ""){
         QString err = "Any protocol have repeated id or name: ";
         err += repeatNammes;
-        MsgBox::Show("error", err.toLatin1().data());
+        MsgBox::Show("error", err.toUtf8().data());
     }
 
     hori_layout->addWidget(_add_button);
diff --git a/DSView/pv/view/ruler.cpp b/DSView/pv/view/ruler.cpp
index 716a5be3..4d75bd65 100755
--- a/DSView/pv/view/ruler.cpp
+++ b/DSView/pv/view/ruler.cpp
@@ -36,7 +36,6 @@
 
 #include <QMouseEvent>
 #include <QPainter>
-#include <QTextStream>
 #include <QStyleOption>  
  
  
@@ -96,21 +95,22 @@ QString Ruler::format_freq(double period, unsigned precision)
         const int prefix = ceil((order - FirstSIPrefixPower) / 3.0f);
         const double multiplier = pow(10.0, max(-prefix * 3.0 - FirstSIPrefixPower, 0.0));
 
+        /*
         QString s;
         QTextStream ts(&s);
         ts.setRealNumberPrecision(precision);
         ts << fixed << 1 / (period  * multiplier) <<
             FreqPrefixes[prefix] << "Hz";
         return s;
-
-        /*
-        char buf[20] = {0};
-        char format[10] = {0}; 
-        sprintf(format, "%%.%df%%s", precision);
-        QString prev = FreqPrefixes[prefix] + "Hz";
-        sprintf(buf, format, 1 / (period  * multiplier), prev.toLatin1().data());
-        return QString(buf);  
         */
+       
+        char buffer[20] = {0};
+        char format[10] = {0};
+        QString units = FreqPrefixes[prefix] + "Hz";
+        sprintf(format, "%%.%df", (int)precision);       
+        sprintf(buffer, format, 1 / (period * multiplier));
+        strcat(buffer, units.toUtf8().data());
+        return QString(buffer);
     }
 }
 
@@ -119,21 +119,24 @@ QString Ruler::format_time(double t, int prefix,
 { 
     const double multiplier = pow(10.0, -prefix * 3 - FirstSIPrefixPower + 6.0);
 
+    /*
 	QString s;
 	QTextStream ts(&s);
 	ts.setRealNumberPrecision(precision);
     ts << fixed << forcesign << (t  * multiplier) / 1000000.0 <<
 		SIPrefixes[prefix] << "s";
 	return s;
-
-    /*
-    char buf[20] = {0};
-    char format[10] = {0}; 
-    sprintf(format, "%%.%df%%s", precision);
-    QString prev = SIPrefixes[prefix] + "s";
-    sprintf(buf, format, (t  * multiplier) / 1000000.0, prev.toLatin1().data());
-    return QString(buf);  
     */
+
+    char buffer[20] = {0};
+    char format[10] = {0}; 
+    QString units = SIPrefixes[prefix] + "s";
+    double v = (t * multiplier) / 1000000.0;
+    buffer[0] = v >= 0 ? '+' : '-';
+    sprintf(format, "%%.%df", (int)precision);   
+    sprintf(buffer + 1, format, v);
+    strcat(buffer + 1, units.toUtf8().data());
+    return QString(buffer);
 }
 
 QString Ruler::format_time(double t)
diff --git a/DSView/pv/view/spectrumtrace.cpp b/DSView/pv/view/spectrumtrace.cpp
index 12f8469f..fde8564f 100755
--- a/DSView/pv/view/spectrumtrace.cpp
+++ b/DSView/pv/view/spectrumtrace.cpp
@@ -210,20 +210,21 @@ QString SpectrumTrace::format_freq(double freq, unsigned precision)
         const int prefix = floor((order - FirstSIPrefixPower)/ 3.0f);
         const double divider = pow(10.0, max(prefix * 3.0 + FirstSIPrefixPower, 0.0));
 
+        /*
         QString s;
         QTextStream ts(&s);
         ts.setRealNumberPrecision(precision);
         ts << fixed << freq / divider << FreqPrefixes[prefix] << "Hz";
         return s;
+        */
 
-        /*
-        char buf[20] = {0};
+        char buffer[20] = {0};
         char format[10] = {0}; 
-        sprintf(format, "%%.%df%%s", precision);
-        QString prev = FreqPrefixes[prefix] + "Hz";
-        sprintf(buf, format, freq / divider, prev.toLatin1().data());
-        return QString(buf); 
-        */ 
+        QString units = FreqPrefixes[prefix] + "Hz";
+        sprintf(format, "%%.%df", (int)precision);    
+        sprintf(buffer, format, freq / divider);
+        strcat(buffer, units.toUtf8().data());
+        return QString(buffer);
     }
 }