TypeError：強制爲Unicode：需要字符串或緩衝區，找到bool ...收到了錯誤？

Question

當我在我的代碼中讀取文件名時，我一直收到「TypeError：強制爲Unicode：需要字符串或緩衝區，發現布爾」。我似乎無法弄清楚，因爲我明確使用filename = str（「QFileDialog .....」）...我哪裏錯了？

class MainWindow(QMainWindow): 
    def __init__(self, filename=None, parent=None): 
     super(MainWindow,self).__init__(parent) 

     self.fileheader=None 
     self.frameheader = None 

     self.initUI() 
     self.resize(900,900) 


     if filename: 
      self.setDataFile(filename) 



    def initUI(self): 
     self.filetable=QTableWidget() 

     self.frametable=QTableWidget() 
     self.filetable.setEditTriggers(self.filetable.NoEditTriggers) 
     self.frametable.setEditTriggers(self.filetable.NoEditTriggers) 

     self.imageBrowser=ImageViewer() 

     self.imagesplitter=QSplitter(Qt.Horizontal) 
     self.tablesplitter=QSplitter(Qt.Horizontal) 
     self.imagesplitter.addWidget(self.imageBrowser) 
     self.tablesplitter.addWidget(self.imagesplitter) 
     self.tablesplitter.addWidget(self.filetable) 
     self.tablesplitter.addWidget(self.frametable) 
     self.setCentralWidget(self.tablesplitter) 

     self._setTables() 
     self._createMenuBar() 

     self.imageBrowser.slider.sliderMoved.connect(self.change_image_index) 


    def _setTables(self): 

     self.filetable.setRowCount(len(FileHeader.fileheader_fields)) 
     self.filetable.setColumnCount(2) 
     self.filetable.setHorizontalHeaderLabels(['File Header','value']) 
     for i,field in enumerate(FileHeader.fileheader_fields): 
      # just set the field names...no data 
      name=QTableWidgetItem(field) 
      #value=QTableWidgetItem(unicode(getattr(self.fileheader,field))) 
      self.filetable.setItem(i,0,name) 
      #self.filetable.setItem(i,1,value) 

     #self.frameheader=self.fileheader.frameAtIndex(0) 
     self.frametable.setRowCount(len(Frame.frameheader_fields)) 
     self.frametable.setColumnCount(2) 
     self.frametable.setHorizontalHeaderLabels(['Frame Header','Value']) 
     for i,fields in enumerate(Frame.frameheader_fields): 
      # name only...no data yet 
      Name=QTableWidgetItem(fields) 
      #Value=QTableWidgetItem(unicode(getattr(self.frameheader,fields))) 
      self.frametable.setItem(i,0,Name) 

    def _createMenuBar(self): 

     menubar=self.menuBar() 

     exitAction=QAction(QIcon('exit.png'),'&Exit',self) 
     exitAction.setShortcut('Ctrl+Q') 
     exitAction.triggered.connect(qApp.quit) 

     openAction=QAction(QIcon('open.png'),'&Open',self) 
     openAction.setShortcut('Ctrl+O') 
     openAction.triggered.connect(self.openNewFile) 
     openAction.triggered.connect(self.setDataFile) 

     fileMenu=menubar.addMenu('&File') 
     fileMenu.addAction(openAction) 
     fileMenu.addAction(exitAction) 



    def populate(self): 
     if not self.frameheader: 
      print "[DEBUG] populate(): self.frameheader is None" 
      return 

     for i,field in enumerate(FileHeader.fileheader_fields): 
      name=QTableWidgetItem(field) 
      value=QTableWidgetItem(unicode(getattr(self.fileheader,field))) 
      self.filetable.setItem(i,0,name) 
      self.filetable.setItem(i,1,value) 

     #self.frametable.setRowCount(len(self.frameheader.frameheader_fields)) 
     #self.frametable.setColumnCount(2) 
     #self.frametable.setHorizontalHeaderLabels(['Frame Header','Value']) 
     for i,fields in enumerate(self.frameheader.frameheader_fields): 
      Name=QTableWidgetItem(fields) 
      Value=QTableWidgetItem(unicode(getattr(self.frameheader,fields))) 
      self.frametable.setItem(i,0,Name) 
      self.frametable.setItem(i,1,Value) 

    def change_image_index(self,val): 
     if not self.fileheader: 
      print "[DEBUG] change_image_index(): self.fileheader is None" 
      return 

     self.frameheader=self.fileheader.frameAtIndex(val) 
     self.populate() 

    def setDataFile(self, filename): 
     self.fileheader=FileHeader(filename) 
     self.imageBrowser.setFileHeader(self.fileheader) 
     #frame=Frame(filename) # you only need the frame on demand 

     self.change_image_index(0) 


    def openNewFile(self): 
     filename=str(QFileDialog.getOpenFileName(None,"open file","C:/vprice/DIDSON/DIDSON Data","*.ddf")) 
     self.setDataFile(filename) 



if __name__=="__main__": 
    app=QApplication([]) 
    w=MainWindow() 
    w.show() 
    w.raise_() 
    app.exec_() 

和錯誤代碼：

Traceback (most recent call last): 
    File "C:\Users\Tory\Desktop\PYTHON NOAA\DIDSONGUIqwttest.py", line 197, in setDataFile 
    self.fileheader=FileHeader(filename) 
    File "C:\Python27\lib\fileheader.py", line 31, in __init__ 
    self.infile=open(filename,'rb') 
TypeError: coercing to Unicode: need string or buffer, bool found 

Answer 1

的問題的根源就在這裏：

openAction.triggered.connect(self.openNewFile) 
openAction.triggered.connect(self.setDataFile) 

你真的要連接到openAction爲setDataFile好？

注意，對於triggered信號的簽名是：

void QAction::triggered (bool checked = false) [signal] 

這意味着setDataFile方法保持獲取調用其filename參數設置爲False - 並解釋了爲什麼你看到的TypeError抱怨接收布爾代替字符串。