Pyqt 屏幕截图工具

从Pyqt的examples中看到一段截图代码， （路径：examplasdesktopscreenshot.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：