【转载】 Pyqt 利用QDataStream对文件进行存取

 1 # -*- coding: utf-8 -*-
 2 from PyQt4.QtGui import *
 3 from PyQt4.QtCore import *
 4 import sys
 5 QTextCodec.setCodecForTr(QTextCodec.codecForName("utf8"))
 6 
 7 class Settings(QDialog):
 8     def __init__(self,parent=None):
 9         super(Settings,self).__init__(parent)
10         self.setWindowTitle(self.tr("利用QDataStream对文件进行存取"))
11         
12         self.label = QLabel(self.tr("通道："))
13         self.channelSpinBox = QSpinBox()
14         self.channelSpinBox.setRange(0,20)
15         self.timeLabel = QLabel(self.tr("第一次运行"))
16         
17         self.label_gong =QLabel(self.tr("功率："))
18         self.powerComboBox = QComboBox()
19         self.powerComboBox.addItem(self.tr("大"),"大")
20         self.powerComboBox.addItem(self.tr("中"),"中")
21         self.powerComboBox.addItem(self.tr("小"),"小")
22         self.saveButton = QPushButton(self.tr("保存"))
23         
24         self.label_Frequency = QLabel(self.tr("频率："))
25         self.FrequencyEdit = QLineEdit()
26         self.getButton = QPushButton(self.tr("读取"))
27         
28         layout = QGridLayout(self)
29         layout.addWidget(self.label,0,0)
30         layout.addWidget(self.channelSpinBox,0,1)
31         layout.addWidget(self.timeLabel,0,2)
32         
33         layout.addWidget(self.label_gong,1,0)
34         layout.addWidget(self.powerComboBox,1,1)
35         layout.addWidget(self.saveButton,1,2)
36         
37         layout.addWidget(self.label_Frequency,2,0)
38         layout.addWidget(self.FrequencyEdit,2,1)
39         layout.addWidget(self.getButton,2,2)
40         
41         self.resize(250,150)
42         
43         self.connect(self.saveButton,SIGNAL("clicked()"),self.slotSave)
44         self.connect(self.getButton,SIGNAL("clicked()"),self.slotGet) 
45         
46     def slotSave(self):
47         self.channel = self.channelSpinBox.value()
48         self.power = self.powerComboBox.currentIndex()
49         self.frequency = self.FrequencyEdit.text()
50         self.time = QDateTime()
51         file = QFile("parameters.dat")
52         file.open(QIODevice.WriteOnly)
53         out = QDataStream(file)
54         out.setVersion(QDataStream.Qt_4_0)
55         
56         out.writeUInt32(0xa1a2a3a4)
57         out.writeUInt32(self.channel)
58         out.writeUInt32(self.power)
59         out.writeString(self.frequency)
60         out << self.time.currentDateTime()
61             
62     def slotGet(self):
63         file = QFile("parameters.dat")
64         file.open(QIODevice.ReadOnly)
65         In = QDataStream(file)
66         In.setVersion(QDataStream.Qt_4_0)
67         magic = In.readUInt32()
68         if magic != 0xa1a2a3a4:
69             QMessageBox.information(self,"exception",self.tr("invalid file format"))
70             return
71         channel = In.readUInt32()
72         power = In.readUInt32()
73         frequency = In.readString() 
74         time = QDateTime()
75         In >> time
76         self.channelSpinBox.setValue(channel)
77         self.powerComboBox.setCurrentIndex(power)
78         self.FrequencyEdit.setText(frequency)
79         lastTime = time.date().toString(Qt.ISODate) + " " + time.time().toString()
80         self.timeLabel.setText(lastTime)
81         
82 app=QApplication(sys.argv)
83 dialog=Settings()
84 dialog.show()
85 app.exec_()