def load_datastream(self, fname): error = None fh = None try: fh = QFile(fname) if not fh.open(QIODevice.ReadOnly): raise IOError(str(fh.errorString())) stream = QDataStream(fh) while not stream.atEnd(): self.label = stream.readQString() self.diameter = stream.readInt32() self.top_elev = stream.readDouble() self.design_load = stream.readDouble() except EnvironmentError as e: error = "Failed to load:{0}".format(e) finally: if fh is not None: fh.close() if error is not None: print(error) self.__dirty = False print("load data from{0}".format(QFileInfo(fname).fileName())) # 缺少计算参数的类
def testCurvePlotItemArray2Path(self): size = 5 x = np.arange(size) y = 2 * np.arange(size) item = CurvePlotItem(x, y) self._widget.addItem(item) p = item._graph # stream path arr = QByteArray() buf = QDataStream(arr, QIODevice.ReadWrite) buf << p buf.device().reset() # test protocol assert arr.size() == 4 + size * 20 + 8 assert buf.readInt32() == size for i in range(5): if i == 0: assert buf.readInt32() == 0 else: assert buf.readInt32() == 1 assert buf.readDouble() == x[i] assert buf.readDouble() == y[i] assert buf.readInt32() == 0 assert buf.readInt32() == 0
class QmyMainWindow(QMainWindow): def __init__(self, parent=None): super().__init__(parent) #调用父类构造函数,创建窗体 self.ui=Ui_MainWindow() #创建UI对象 self.ui.setupUi(self) #构造UI界面 self.ui.groupBox.setEnabled(False) self.ui.actSaveALL.setEnabled(False) self.ui.actReadALL.setEnabled(False) self.setWindowTitle("二进制文件流化读写") self.__testFileName="" #测试用文件的文件名 ## ==============自定义功能函数============ def __iniWrite(self): ##初始化写文件操作 self.fileDevice=QFile(self.__testFileName) #创建文件对象 if not self.fileDevice.open(QIODevice.WriteOnly): del self.fileDevice #删除对象 return False self.fileStream=QDataStream(self.fileDevice) #流对象 self.fileStream.setVersion(QDataStream.Qt_5_12) #设置版本号,写入和读取的版本号要兼容 if self.ui.radio_BigEndian.isChecked(): self.fileStream.setByteOrder(QDataStream.BigEndian) else: self.fileStream.setByteOrder(QDataStream.LittleEndian) ##必须要设置精度,float和double都按照这个精度 precision=QDataStream.DoublePrecision if self.ui.radio_Single.isChecked(): precision=QDataStream.SinglePrecision self.fileStream.setFloatingPointPrecision(precision) return True def __delFileStream(self): ##结束写文件操作 self.fileDevice.close() del self.fileStream del self.fileDevice def __iniRead(self): ##开始读文件操作 if not QFile.exists(self.__testFileName): QMessageBox.critical(self,"错误","文件不存在") return False self.fileDevice=QFile(self.__testFileName) #创建文件对象 if not self.fileDevice.open(QIODevice.ReadOnly): del self.fileDevice #删除对象 return False self.fileStream=QDataStream(self.fileDevice) self.fileStream.setVersion(QDataStream.Qt_5_12) #设置流版本号,写入和读取的版本号要兼容 if self.ui.radio_BigEndian.isChecked(): self.fileStream.setByteOrder(QDataStream.BigEndian) else: self.fileStream.setByteOrder(QDataStream.LittleEndian) ##必须要设置精度,float和double都按照这个精度 precision=QDataStream.DoublePrecision if self.ui.radio_Single.isChecked(): precision=QDataStream.SinglePrecision self.fileStream.setFloatingPointPrecision(precision) return True ## ==========由connectSlotsByName() 自动连接的槽函数================== @pyqtSlot() ##选择测试用文件 def on_btnFile_clicked(self): curPath=QDir.currentPath() #当前目录 title="选择文件" #对话框标题 filt="流数据文件(*.stream)" #文件过滤器 fileName,flt=QFileDialog.getSaveFileName(self,title,curPath,filt) if (fileName == ""): return self.__testFileName=fileName #测试用文件 self.ui.editFilename.setText(fileName) self.ui.groupBox.setEnabled(True) self.ui.actSaveALL.setEnabled(True) self.ui.actReadALL.setEnabled(True) @pyqtSlot() ##写 int8 def on_btnInt8_Write_clicked(self): Value=self.ui.spin_Int8.value() #Python int if self.__iniWrite(): try: self.fileStream.writeInt8(Value) except Exception as e: QMessageBox.critical(self, "writeInt8()出现错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 int8 def on_btnInt8_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readInt8() self.ui.edit_Int8.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写 uint8 def on_btnUInt8_Write_clicked(self): Value=self.ui.spin_UInt8.value() if self.__iniWrite(): try: self.fileStream.writeUInt8(Value) except Exception as e: QMessageBox.critical(self, "writeUInt8()出现错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 uint8 def on_btnUInt8_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readUInt8() self.ui.edit_UInt8.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写int16 def on_btnInt16_Write_clicked(self): Value=self.ui.spin_Int16.value() #Python的int if self.__iniWrite(): try: self.fileStream.writeInt16(Value) #以int16类型写入文件 except Exception as e: QMessageBox.critical(self, "writeInt16()发生错误", str(e)) finally: self.__delFileStream() ## print("finally被执行") @pyqtSlot() ##读 int16 def on_btnInt16_Read_clicked(self): if self.__iniRead(): try: Value=self.fileStream.readInt16() self.ui.edit_Int16.setText("%d"%Value) except Exception as e: QMessageBox.critical(self, "readInt16()发生错误", str(e)) finally: self.__delFileStream() ## print("finally被执行") @pyqtSlot() ##写 uint16 def on_btnUInt16_Write_clicked(self): Value=self.ui.spin_UInt16.value() if self.__iniWrite(): try: self.fileStream.writeUInt16(Value) except Exception as e: QMessageBox.critical(self, "writeUInt16()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 uint16 def on_btnUIn16_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readUInt16() self.ui.edit_UInt16.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写 int32 def on_btnInt32_Write_clicked(self): Value=self.ui.spin_Int32.value() if self.__iniWrite(): try: self.fileStream.writeInt32(Value) except Exception as e: QMessageBox.critical(self, "writeInt32()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 int32 def on_btnInt32_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readInt32() self.ui.edit_Int32.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写 int64 def on_btnInt64_Write_clicked(self): Value=self.ui.spin_Int64.value() if self.__iniWrite(): try: self.fileStream.writeInt64(Value) except Exception as e: QMessageBox.critical(self, "writeInt64()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 int64 def on_btnInt64_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readInt64() self.ui.edit_Int64.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写 int def on_btnInt_Write_clicked(self): Value=self.ui.spin_Int.value() if self.__iniWrite(): try: self.fileStream.writeInt(Value) except Exception as e: QMessageBox.critical(self, "writeInt()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 int def on_btnInt_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readInt() self.ui.edit_Int.setText("%d"%Value) self.__delFileStream() @pyqtSlot() ##写 bool def on_btnBool_Write_clicked(self): Value=self.ui.chkBox_In.isChecked() #bool型 if self.__iniWrite(): self.fileStream.writeBool(Value) self.__delFileStream() @pyqtSlot() ##读 bool def on_btnBool_Read_clicked(self): if self.__iniRead(): Value=self.fileStream.readBool() #bool型 self.ui.chkBox_Out.setChecked(Value) self.__delFileStream() @pyqtSlot() ##写 float def on_btnFloat_Write_clicked(self): Value=self.ui.spin_Float.value() if self.__iniWrite(): try: self.fileStream.writeFloat(Value) except Exception as e: QMessageBox.critical(self, "writeFloat()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 float def on_btnFloat_Read_clicked(self): if self.__iniRead(): try: Value=self.fileStream.readFloat() self.ui.edit_Float.setText("%.4f"%Value) except Exception as e: QMessageBox.critical(self, "writeFloat()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##写 double def on_btnDouble_Write_clicked(self): Value=self.ui.spin_Double.value() if self.__iniWrite(): try: self.fileStream.writeDouble(Value) except Exception as e: QMessageBox.critical(self, "writeDouble()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 double def on_btnDouble_Read_clicked(self): if self.__iniRead(): try: Value=self.fileStream.readDouble() self.ui.edit_Double.setText("%.4f"%Value) except Exception as e: QMessageBox.critical(self, "readDouble()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##写 QString,与Python的str兼容 def on_btnQStr_Write_clicked(self): Value=self.ui.editQStr_In.text() if self.__iniWrite(): try: self.fileStream.writeQString(Value) except Exception as e: QMessageBox.critical(self, "writeQString()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 QString,与Python的str兼容 def on_btnQStr_Read_clicked(self): if self.__iniRead(): try: Value=self.fileStream.readQString() self.ui.editQStr_Out.setText(Value) except Exception as e: QMessageBox.critical(self, "readQString()发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##写 String def on_btnStr_Write_clicked(self): strV=self.ui.editStr_In.text() #str类型 if self.__iniWrite(): try: bts=bytes(strV,encoding="utf-8") #转换为bytes类型 self.fileStream.writeString(bts) except Exception as e: QMessageBox.critical(self, "写入时发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读 String def on_btnStr_Read_clicked(self): if self.__iniRead(): try: Value=self.fileStream.readString() #bytes类型 strV=Value.decode("utf-8") #从bytes类型解码为字符串,编码utf-8 self.ui.editStr_Out.setText(strV) except Exception as e: QMessageBox.critical(self, "读取时发生错误", str(e)) finally: self.__delFileStream() ##===字体的写入与读取 @pyqtSlot() ##选择字体 def on_btnFont_In_clicked(self): font=self.ui.btnFont_In.font() font,OK=QFontDialog.getFont(font,self) #选择字体 if OK: self.ui.btnFont_In.setFont(font) @pyqtSlot() ##写 QVariant, QFont def on_btnFont_Write_clicked(self): font=self.ui.btnFont_In.font() #QFont类型 if self.__iniWrite(): self.fileStream.writeQVariant(font) #QFont类型 self.__delFileStream() @pyqtSlot() ##读 QVariant, QFont def on_btnFont_Read_clicked(self): if self.__iniRead(): try: font=self.fileStream.readQVariant() #QFont类型 self.ui.editFont_Out.setFont(font) except Exception as e: QMessageBox.critical(self, "读取时发生错误", str(e)) finally: self.__delFileStream() ##===颜色的写入与读取 @pyqtSlot() ##选择颜色 def on_btnColor_In_clicked(self): plet=self.ui.btnColor_In.palette() #QPalette color=plet.buttonText().color() #QColor color= QColorDialog.getColor(color,self) if color.isValid(): plet.setColor(QPalette.ButtonText,color) self.ui.btnColor_In.setPalette(plet) @pyqtSlot() ##写 QVariant, QColor def on_btnColor_Write_clicked(self): plet=self.ui.btnColor_In.palette() color=plet.buttonText().color() #QColor if self.__iniWrite(): self.fileStream.writeQVariant(color) #QColor self.__delFileStream() @pyqtSlot() ##读 QVariant, QColor def on_btnColor_Read_clicked(self): if self.__iniRead(): try: color=self.fileStream.readQVariant() #读取为QColor类型 plet=self.ui.editColor_Out.palette() plet.setColor(QPalette.Text,color) self.ui.editColor_Out.setPalette(plet) except Exception as e: QMessageBox.critical(self, "读取时发生错误", str(e)) finally: self.__delFileStream() @pyqtSlot() ##读出编辑框全清空 def on_actClearOutput_triggered(self): self.ui.edit_Int8.clear() self.ui.edit_UInt8.clear() self.ui.edit_Int16.clear() self.ui.edit_UInt16.clear() self.ui.edit_Int32.clear() self.ui.edit_Int64.clear() self.ui.edit_Int.clear() self.ui.edit_Float.clear() self.ui.edit_Double.clear() font=self.font() self.ui.editFont_Out.setFont(font) plet=self.palette() self.ui.editColor_Out.setPalette(plet) @pyqtSlot() ##连续写入文件 def on_actSaveALL_triggered(self): if not self.__iniWrite(): QMessageBox.critical(self,"错误","为写入打开文件时出错") return #数据写入部分 Value=self.ui.spin_Int8.value() self.fileStream.writeInt8(Value) #int8 Value=self.ui.spin_UInt8.value() self.fileStream.writeUInt8(Value) #uint8 Value=self.ui.spin_Int16.value() self.fileStream.writeInt16(Value) #int16 Value=self.ui.spin_UInt16.value() self.fileStream.writeUInt16(Value) #uint16 Value=self.ui.spin_Int32.value() self.fileStream.writeInt32(Value) #int32 Value=self.ui.spin_Int64.value() self.fileStream.writeInt64(Value) #int64 Value=self.ui.spin_Int.value() self.fileStream.writeInt(Value) #int Value=self.ui.chkBox_In.isChecked() self.fileStream.writeBool(Value) #bool Value=self.ui.spin_Float.value() self.fileStream.writeFloat(Value) #float Value=self.ui.spin_Double.value() self.fileStream.writeDouble(Value) #double str_Value=self.ui.editQStr_In.text() self.fileStream.writeQString(str_Value) #QString str_Value=self.ui.editStr_In.text() #str类型 bts=bytes(str_Value,encoding="utf-8") #转换为bytes类型 self.fileStream.writeString(bts) font=self.ui.btnFont_In.font() self.fileStream.writeQVariant(font) #QFont plet=self.ui.btnColor_In.palette() color=plet.buttonText().color() self.fileStream.writeQVariant(color) #QColor #数据写入完成 self.__delFileStream() QMessageBox.information(self,"消息","数据连续写入完成.") @pyqtSlot() ##连续读取文件 def on_actReadALL_triggered(self): if not self.__iniRead(): QMessageBox.critical(self,"错误","为读取打开文件时出错") return #数据读取部分 Value=self.fileStream.readInt8() #int8 self.ui.edit_Int8.setText("%d"%Value) Value=self.fileStream.readUInt8() #uint8 self.ui.edit_UInt8.setText("%d"%Value) Value=self.fileStream.readInt16() #int16 self.ui.edit_Int16.setText("%d"%Value) Value=self.fileStream.readUInt16() #uint16 self.ui.edit_UInt16.setText("%d"%Value) Value=self.fileStream.readInt32() #int32 self.ui.edit_Int32.setText("%d"%Value) Value=self.fileStream.readInt64() #int64 self.ui.edit_Int64.setText("%d"%Value) Value=self.fileStream.readInt() #int self.ui.edit_Int.setText("%d"%Value) Value=self.fileStream.readBool() #bool self.ui.chkBox_Out.setChecked(Value) Value=self.fileStream.readFloat() #float self.ui.edit_Float.setText("%.4f"%Value) Value=self.fileStream.readDouble() #double self.ui.edit_Double.setText("%.4f"%Value) str_Value=self.fileStream.readQString() #str self.ui.editQStr_Out.setText(str_Value) byteStr=self.fileStream.readString() #bytes str_Value=byteStr.decode("utf-8") #从bytes类型解码为字符串 self.ui.editStr_Out.setText(str_Value) font=self.fileStream.readQVariant() #QFont self.ui.editFont_Out.setFont(font) color=self.fileStream.readQVariant() #QColor plet=self.ui.editColor_Out.palette() plet.setColor(QPalette.Text,color) self.ui.editColor_Out.setPalette(plet) #数据写入完成 self.__delFileStream() QMessageBox.information(self,"消息","数据连续读取完成.")