PyQt5学习（7）：打印Qprinter

x详情参考Qt官网

参考：https://blog.csdn.net/jia666666/article/details/81590005

https://www.jianshu.com/p/bb8e9b3ad9f7

https://www.jianshu.com/p/8298c2474630

---

流程：实例化Qprinter --》设置打印弹出QprintDialog --》调用文本的打印方法.print（）

例子：打印图像

#coding=utf-8
import sys
from PyQt5.QtWidgets import QWidget,QLabel,QAction,QCheckBox,QApplication,QMainWindow,QGridLayout
from PyQt5.QtCore import Qt,QRect
from PyQt5.QtGui import QPainter,QPixmap,QImage
#打印支持模块，Qprint打印模块，QprintDialog调出打印窗口，QpagesteupDialog调出打印设置窗口
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog,QPageSteupDialog

class SignalDemo(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initGUI()
    def initGUI(self):
        self.setGeometry(300,300,300,200)
        widget=QWidget()
        grid=QGridLayout()
        widget.setLayout(grid)
        self.setCentralWidget(widget)
        #生成menubar栏
        self.createBar()

        #label
        #加载图片
        self.img=QImage('./a.ico')
        self.label=QLabel()
        grid.addWidget(self.label,0,0)
        self.label.setPixmap(QPixmap.fromImage(self.img))

        self.show()
    def createBar(self):  #生成menubar
        file=self.menuBar().addMenu(self.tr('File'))
        da=QAction('打印',self)
        da.setShortcut('Ctrl+p')
        file.addAction(da)
        da.triggered.connect(self.showPrint) #信号槽

    def showPrint(self):
        #实例化打印图像对象
        printer=QPrinter()
        #打印窗口弹出
        printdialog=QPrintDialog(printer,self)
        #绘制
        if printdialog.exec_():
            #调用绘图
            painter=QPainter(printer)
            #实例化视图窗口
            rect=painter.viewport()
            #获取图片的尺寸
            size=self.img.size()
            #Qt.KeepAspectRatio  保持纵横比
            size.scale(rect.size(),Qt.KeepAspectRatio)
            #设置窗口的大小为图片的磁村，并在窗口内绘制
            painter.setViewport(rect.x(),rect.y(),size.width(),size.height())
            painter.setWindow(self.img.rect)
            painter.drawImage(0,0,self.img)

        

if __name__=='__main__':
    app=QApplication(sys.argv)
    demo=SignalDemo()
    sys.exit(app.exec_())

例二：

import sys
from PyQt5.QtWidgets import QApplication,QLabel,QMainWindow,QFormLayout,QWidget,QAction
from PyQt5.QtPrintSupport import QPrinter
from PyQt5.QtGui import QTextCursor,QTextDocument,QImage,QPixmap

class printDemo(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('打印demo')
        self.setGeometry(300,300,400,300)
        widget=QWidget()
        self.setCentralWidget(widget)
        layout=QFormLayout()
        widget.setLayout(layout)


        self.img=QImage('./a.ico')
        label=QLabel()
        label.setPixmap(QPixmap.fromImage(self.img))
        layout.addRow('图片打印',label)

        self.text='tststtas飒飒嘎嘎嘎啥归属感'
        label=QLabel()
        label.setText(self.tr(self.text))
        layout.addRow('文章打印',label)





        file=self.menuBar().addMenu('File')
        action1=QAction('转为pdf',self)
        action1.setShortcut('Ctrl+p')
        file.addAction(action1)
        action1.triggered.connect(self.printShow)


    
    def printShow(self):
        printer=QPrinter()
        #设置打印输出的形式：可以设置为输出pdf格式
        printer.setOutputFormat(QPrinter.PdfFormat)
        #设置输出的路径为当前
        printer.setOutputFileName('test.pdf')
        #实例化一个富文本
        document=QTextDocument()
        #实例化一个文本指针并指向document的光标
        cursor=QTextCursor(document)
        #富文本添加内容
        cursor.insertImage(self.img)
        cursor.insertText(self.text)
        #调用print（）方法 参数为当前实例化的打印函数
        document.print(printer)
        
    



if __name__=='__main__':
    app=QApplication(sys.argv)
    demo=printDemo()
    demo.show()
    sys.exit(app.exec())

 

例三：1，调用打印对话框，2，调用打印预览框3，直接打印，4打印到Pdf

import sys
from PyQt5.QtWidgets import QApplication,QLabel,QMainWindow,QFormLayout,QDialog,QWidget,QAction
from PyQt5.QtPrintSupport import QPrinter,QPrintDialog,QPrintPreviewDialog
from PyQt5.QtGui import QTextCursor,QTextDocument,QImage,QPixmap
 
#需要打印的文字
text='11111111111wwwwwwwwwww呜呜呜呜呜呜呜呜无无无无'  

class printDemo(QMainWindow):
    def __init__(self):
        super().__init__()
        self.initUI()
    def initUI(self):
        self.setWindowTitle('打印demo')
        self.setGeometry(300,300,300,200)
        self.createBar()
    
    #设置menuBar
    def createBar(self):
        bar=self.menuBar()
        printmenu=bar.addMenu('打印')

        #直接打印不显示
        printAction1=QAction('直接打印不显示',self)
        printmenu.addAction(printAction1)
        printAction1.triggered.connect(self.no_showPrinter)

         #打印弹出设置对话框
        printAction2=QAction('打印弹出设置',self)
        printmenu.addAction(printAction2)
        printAction2.triggered.connect(self.show_steupPrinter)

        
         #打印弹出预览对话框
        printAction3=QAction('打印弹出预览',self)
        printmenu.addAction(printAction3)
        printAction3.triggered.connect(self.show_previewPrinter)

        
         #打印输出pdf
        printAction4=QAction('打印输出pdf',self)
        printmenu.addAction(printAction4)
        printAction4.triggered.connect(self.show_pdfPrinter)

#打印不显示
    def no_showPrinter(self):
        printer=QPrinter()
        self.handlePaintRequest(printer)

#打印显示设置
    def show_steupPrinter(self):
        printer=QPrinter()
        printDialog=QPrintDialog(printer)
        if printDialog.exec_()==QDialog.Accepted:
            self.handlePaintRequest(printer)



#打印预览       
#  ------------------这个比较特殊-----------------------------------
    def show_previewPrinter(self):
        dialog=QPrintPreviewDialog()
        dialog.paintRequested.connect(self.handlePaintRequest)
        dialog.exec_()
-
#输出pdf格式不打印
    def show_pdfPrinter(self):
        printer=QPrinter()
        printDialog=QPrintDialog(printer)
        printer.setOutputFormat(QPrinter.PdfFormat)
        printer.setOutputFileName('a.pdf')
        self.handlePaintRequest(printer)
        



    #打印函数
    def handlePaintRequest(self,printer):
        #流程将文本或图片，其他写入QTextdocument中，然后调用print函数
        document=QTextDocument()
        cursor=QTextCursor(document)
        cursor.insertText(text)
        document.print(printer)


    


if __name__=='__main__':
    app=QApplication(sys.argv)
    demo=printDemo()
    demo.show()
    sys.exit(app.exec())