Pyqt 屏幕截图工具

从Pyqt的examples中看到一段截图代码， （路径：examplas\desktop\screenshot.py）
所以想自己UI下界面，手动练习下

通过UI生成的： Screenshot.py

 # -*- coding: utf-8 -*-

 # Form implementation generated from reading ui file 'Screenshot.ui'
 #
 # Created: Mon Mar 30 11:41:46 2015
 #      by: PyQt4 UI code generator 4.10.3
 #
 # WARNING! All changes made in this file will be lost!

 from PyQt4 import QtCore, QtGui

 try:
     _fromUtf8 = QtCore.QString.fromUtf8
 except AttributeError:
     def _fromUtf8(s):
         return s

 try:
     _encoding = QtGui.QApplication.UnicodeUTF8
     def _translate(context, text, disambig):
         return QtGui.QApplication.translate(context, text, disambig, _encoding)
 except AttributeError:
     def _translate(context, text, disambig):
         return QtGui.QApplication.translate(context, text, disambig)

 class Ui_ScrShot(object):
     def setupUi(self, ScrShot):
         ScrShot.setObjectName(_fromUtf8("ScrShot"))
         ScrShot.resize(270, 270)
         self.verticalLayout = QtGui.QVBoxLayout(ScrShot)
         self.verticalLayout.setObjectName(_fromUtf8("verticalLayout"))
         self.labelShow = QtGui.QLabel(ScrShot)
         sizePolicy = QtGui.QSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)
         sizePolicy.setHorizontalStretch(0)
         sizePolicy.setVerticalStretch(0)
         sizePolicy.setHeightForWidth(self.labelShow.sizePolicy().hasHeightForWidth())
         self.labelShow.setSizePolicy(sizePolicy)
         self.labelShow.setText(_fromUtf8(""))
         self.labelShow.setObjectName(_fromUtf8("labelShow"))
         self.verticalLayout.addWidget(self.labelShow)
         self.groupBox = QtGui.QGroupBox(ScrShot)
         self.groupBox.setObjectName(_fromUtf8("groupBox"))
         self.verticalLayout_2 = QtGui.QVBoxLayout(self.groupBox)
         self.verticalLayout_2.setObjectName(_fromUtf8("verticalLayout_2"))
         self.horizontalLayout_2 = QtGui.QHBoxLayout()
         self.horizontalLayout_2.setObjectName(_fromUtf8("horizontalLayout_2"))
         self.labelSpinBox = QtGui.QLabel(self.groupBox)
         self.labelSpinBox.setObjectName(_fromUtf8("labelSpinBox"))
         self.horizontalLayout_2.addWidget(self.labelSpinBox)
         self.spinBox = QtGui.QSpinBox(self.groupBox)
         self.spinBox.setObjectName(_fromUtf8("spinBox"))
         self.horizontalLayout_2.addWidget(self.spinBox)
         self.verticalLayout_2.addLayout(self.horizontalLayout_2)
         self.checkBoxHideThis = QtGui.QCheckBox(self.groupBox)
         self.checkBoxHideThis.setObjectName(_fromUtf8("checkBoxHideThis"))
         self.verticalLayout_2.addWidget(self.checkBoxHideThis)
         self.verticalLayout.addWidget(self.groupBox)
         self.horizontalLayout = QtGui.QHBoxLayout()
         self.horizontalLayout.setObjectName(_fromUtf8("horizontalLayout"))
         spacerItem = QtGui.QSpacerItem(40, 20, QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Minimum)
         self.horizontalLayout.addItem(spacerItem)
         self.pushButtonNew = QtGui.QPushButton(ScrShot)
         self.pushButtonNew.setObjectName(_fromUtf8("pushButtonNew"))
         self.horizontalLayout.addWidget(self.pushButtonNew)
         self.pushButtonSave = QtGui.QPushButton(ScrShot)
         self.pushButtonSave.setObjectName(_fromUtf8("pushButtonSave"))
         self.horizontalLayout.addWidget(self.pushButtonSave)
         self.pushButton_Quit = QtGui.QPushButton(ScrShot)
         self.pushButton_Quit.setObjectName(_fromUtf8("pushButton_Quit"))
         self.horizontalLayout.addWidget(self.pushButton_Quit)
         self.verticalLayout.addLayout(self.horizontalLayout)

         self.retranslateUi(ScrShot)
         QtCore.QMetaObject.connectSlotsByName(ScrShot)

     def retranslateUi(self, ScrShot):
         ScrShot.setWindowTitle(_translate("ScrShot", "Form", None))
         self.groupBox.setTitle(_translate("ScrShot", "Options", None))
         self.labelSpinBox.setText(_translate("ScrShot", "Screenstot Delay:", None))
         self.checkBoxHideThis.setText(_translate("ScrShot", "Hide This Window", None))
         self.pushButtonNew.setText(_translate("ScrShot", "新建", None))
         self.pushButtonSave.setText(_translate("ScrShot", "保存", None))
         self.pushButton_Quit.setText(_translate("ScrShot", "退出", None))

 if __name__ == "__main__":
     import sys
     app = QtGui.QApplication(sys.argv)
     ScrShot = QtGui.QWidget()
     ui = Ui_ScrShot()
     ui.setupUi(ScrShot)
     ScrShot.show()
     sys.exit(app.exec_())

 逻辑代码; MainScreenShot.py

 # -*- coding: utf-8 -*-
 from  PyQt4 import  QtCore, QtGui
 from  Screenshot import  Ui_ScrShot
 import sys
 import icoqrc
 class MainFrom(QtGui.QWidget):
     def __init__(self):
         super(MainFrom, self).__init__()
         self.Ui = Ui_ScrShot()
         self.Ui.setupUi(self)
         self.Ui.labelShow.setSizePolicy(QtGui.QSizePolicy.Expanding, QtGui.QSizePolicy.Expanding)  # size 策略为 可扩展 expanding
         self.Ui.labelShow.setAlignment(QtCore.Qt.AlignCenter)   #alignment 对齐方式 居中
         self.Ui.labelShow.setMinimumSize(240, 160)   # 最小为 240 X 160
         self.setWindowFlags(QtCore.Qt.WindowStaysOnTopHint)  # 设置总是在最前
         self.setWindowTitle(u'截图工具')
         self.setWindowIcon(QtGui.QIcon(':qq.ico'))

         self.shootScreen()
         self.Ui.spinBox.setSuffix(' s')
         self.Ui.spinBox.setMaximum(60)
         self.Ui.spinBox.setValue(5)

         self.Ui.pushButtonNew.clicked.connect(self.newScreenshot)   # 从新开始新建截图
         self.Ui.pushButtonSave.clicked.connect(self.saveScreenshot)  # 保存截图
         self.Ui.pushButton_Quit.clicked.connect(self.close)  # 退出

     # 截图
     def shootScreen(self):
         if self.Ui.spinBox.value() != 0:
             QtGui.qApp.beep()   #操作带上系统的响铃
         self.originalPixmap = QtGui.QPixmap.grabWindow(QtGui.QApplication.desktop().winId())  # 获取 屏幕桌面截图
         self.updateScreenshotLabel()
         self.Ui.pushButtonNew.setDisabled(False)
         if self.Ui.checkBoxHideThis.isChecked():  # 当选择隐藏按钮为True时， 截图完成显示窗体
             self.show()

         #  获取图片显示在label上
     def updateScreenshotLabel(self):
         # self.originalPixmap.scaled()  scaled()函数的声明const返回一个Qpixmap
         # QtCore.Qt.KeepAspectRatio 尽可能大的在一个给定的矩形大小缩放到一个矩形且保持长宽比。
         # QtCore.Qt.SmoothTransformation 平滑转换
         self.Ui.labelShow.setPixmap(self.originalPixmap.scaled(self.Ui.labelShow.size(), QtCore.Qt.KeepAspectRatio, QtCore.Qt.SmoothTransformation))

         # 保存截图图片
     def saveScreenshot(self):
         format = 'png'
         initialPath = QtCore.QDir.currentPath() + "/untitled." + format

         fileName = QtGui.QFileDialog.getSaveFileName(self, u"另存为",
                 initialPath,
                 "%s Files (*.%s)" % (format.upper(), format))
         if fileName:
             self.originalPixmap.save(fileName, format)

         # 新创建截图
     def newScreenshot(self):
         if self.Ui.checkBoxHideThis.isChecked():
             self.hide()
         self.Ui.pushButtonNew.setDisabled(True)
         QtCore.QTimer.singleShot(self.Ui.spinBox.value() * 1000, self.shootScreen)  # * 秒后触发截图

     # 重载 resizeEvent 方法
     def resizeEvent(self, event):
         scaledSize = self.originalPixmap.size()
         scaledSize.scale(self.Ui.labelShow.size(), QtCore.Qt.KeepAspectRatio)
         if not self.Ui.labelShow.pixmap() or scaledSize != self.Ui.labelShow.pixmap().size():   # 当pixmap改变大小时候重新加载updateScreenshotLabel
             self.updateScreenshotLabel()

 if __name__ == '__main__':
     App = QtGui.QApplication(sys.argv)
     MainApp = MainFrom()
     MainApp.show()
     sys.exit(App.exec_())
      

效果：