clear self.Vars before parsing elf file

README.md

@@ -9,7 +9,7 @@ To use DAPLink, you need additional pyusb for CMSIS-DAPv2 and another usb-backen
 pip install PyQt5 PyQtChart pyusb hidapi six pyelftools
 ```
 
-![](./截屏.gif)
+![](./Image/截屏.gif)
 
 data format for wave show:
 + 1 wave: 11, 22, 33,
@@ -21,6 +21,6 @@ data format for wave show:
 ## J-Scope HSS mode
 When select elf file path in address combobox, RTTView read selected variable directly from memory at specified address, rather from RTT buffer.
 
-![](./截屏.jpg)
+![](./Image/截屏.jpg)
 
 Double-click the table cell to bring up the variable adding dialog.

RTTView.py

@@ -459,16 +459,18 @@ def on_cmbAddr_currentIndexChanged(self, text):
             try:
                 from elftools.elf.elffile import ELFFile
                 elffile = ELFFile(open(text, 'rb'))
-            except Exception as e:
-                print(f'open elf file fail: {e}')
-            else:
+
+                self.Vars = {}
                 for sym in elffile.get_section_by_name('.symtab').iter_symbols():
                     if sym.entry['st_info']['type'] == 'STT_OBJECT' and sym.entry['st_size'] in (1, 2, 4, 8):
                         self.Vars[sym.name] = Variable(sym.name, sym.entry['st_value'], sym.entry['st_size'])
 
                 for var in self.Vars.values():
                     print(f'{var.name:30s} @ {var.addr:08X}, len={var.size}')
 
+            except Exception as e:
+                print(f'parse elf file fail: {e}')
+
     @pyqtSlot(int, int)
     def on_tblVar_cellDoubleClicked(self, row, column):
         if self.btnOpen.text() == '关闭连接': return