Python之ReportLab绘制条形码和二维码的实例

#引入所需要的基本包from reportlab.pdfgen import canvasfrom reportlab.graphics.barcode import code39, code128, code93from reportlab.graphics.barcode import eanbc, qr, uspsfrom reportlab.graphics.shapes import Drawing from reportlab.lib.units import mmfrom reportlab.graphics import renderPDF#----------------------------------------------------------------------def createBarCodes(c):  barcode_value = "1234567890"  barcode39 = code39.Extended39(barcode_value)  barcode39Std = code39.Standard39(barcode_value, barHeight=20, stop=1)  # code93 also has an Extended and MultiWidth version  barcode93 = code93.Standard93(barcode_value)  barcode128 = code128.Code128(barcode_value)  # the multiwidth barcode appears to be broken   #barcode128Multi = code128.MultiWidthBarcode(barcode_value)  barcode_usps = usps.POSTNET("50158-9999")  codes = [barcode39, barcode39Std, barcode93, barcode128, barcode_usps]  x = 1 * mm  y = 285 * mm  for code in codes:    code.drawOn(c, x, y)    y = y - 15 * mm  # draw the eanbc8 code  barcode_eanbc8 = eanbc.Ean8BarcodeWidget(barcode_value)  d = Drawing(50, 10)  d.add(barcode_eanbc8)  renderPDF.draw(d, c, 15, 555)  # draw the eanbc13 code  barcode_eanbc13 = eanbc.Ean13BarcodeWidget(barcode_value)  d = Drawing(50, 10)  d.add(barcode_eanbc13)  renderPDF.draw(d, c, 15, 465)  # draw a QR code  qr_code = qr.QrCodeWidget('http://blog.csdn.net/webzhuce')  bounds = qr_code.getBounds()  width = bounds[2] - bounds[0]  height = bounds[3] - bounds[1]  d = Drawing(45, 45, transform=[45./width,0,0,45./height,0,0])  d.add(qr_code)  renderPDF.draw(d, c, 15, 405)#定义要生成的pdf的名称c=canvas.Canvas("barcodes.pdf")#调用函数生成条形码和二维码，并将canvas对象作为参数传递createBarCodes(c)#showPage函数：保存当前页的canvasc.showPage()#save函数：保存文件并关闭canvasc.save()