Does WebWidget's printToPdf work on Mac?

Development
1

Hi. I would like to know if this script to create a pdfReport with a webwidget works on Mac (it does work on Windows):

#get/create directories/paths
import os

desktopPath = os.path.join(os.path.expanduser("~"), "Desktop")
reportFolderPath = os.path.join(desktopPath, "ReportFolder")

if not os.path.exists(reportFolderPath):
    os.makedirs(reportFolderPath)

reportPath = os.path.join(
    reportFolderPath, "PDFReport.pdf"
)

import tempfile
tempFolderPath = tempfile.mkdtemp()

pdfReportPicturePath = os.path.join(
    tempFolderPath, "pdfReportPicture.png"
)

#load CT
import SampleData
sampleDataLogic = SampleData.SampleDataLogic()
ct = sampleDataLogic.downloadCTChest()

#take report picture
import ScreenCapture

redSliceNode = slicer.mrmlScene.GetNodeByID("vtkMRMLSliceNodeRed")

screenCaptureLogic = ScreenCapture.ScreenCaptureLogic()
view = screenCaptureLogic.viewFromNode(redSliceNode)
screenCaptureLogic.captureImageFromView(view, pdfReportPicturePath)

#create html code
_html = f"""
        <html>
        <body>
        <h1>Test PDF Report</h1>
        <img src="{pdfReportPicturePath}" alt="" border=3 width=300></img>
        <br>
        </body>
        </html>
        """

#create html file
htmlPath = os.path.join(tempFolderPath, "pdfReport.html")
file = qt.QFile(htmlPath)
file.open(qt.QIODevice.WriteOnly | qt.QIODevice.Text)
file.write(_html)
file.close()

#page layout for the pdf
pageLayout = qt.QPageLayout(
    qt.QPageSize(qt.QPageSize.A4),
    qt.QPageLayout.Portrait,
    qt.QMarginsF(15, 15, 0, 15),
    qt.QPageLayout.Millimeter,
)

#create webwidget, load html page, print pdf and open it
webWidget = slicer.qSlicerWebWidget()

def onWebWidgetLoadFinished(result):
    webWidget.loadFinished.disconnect(onWebWidgetLoadFinished)
    webWidget.pdfPrintingFinished.connect(onWebWidgetPDFPrintingFinished)
    webWidget.printToPdf(reportPath, pageLayout)

def onWebWidgetPDFPrintingFinished(filePath, result):
    webWidget.pdfPrintingFinished.disconnect(
        onWebWidgetPDFPrintingFinished
    )
    #
    from shutil import rmtree
    #
    rmtree(tempFolderPath, ignore_errors=True)
    #
    # Open in PDF viewer
    print("Starting '" + reportPath + "' ...")
    # slash/backlash replacements because of active directory
    import subprocess
    #
    subprocess.Popen([reportPath], shell=True)

webWidget.loadFinished.connect(onWebWidgetLoadFinished)
webWidget.setUrl(htmlPath.replace("\\", "/"))

If it doesn’t work on Mac, do you know any workaround to make it work?

@Sam_Horvath

2

With today’s nightly it runs but the webWidget and the pdf are blank.

Changing the last line to this works:

webWidget.url = "file://" + htmlPath.replace("\\", "/")
1 Like
3

Thanks @pieper.

Is there any function I can call to check in what OS Slicer is running on?

4

Is there any function I can call to check in what OS Slicer is running on?

slicer.app.os

5

You don’t need to do anything different based on the os - the file:// should also work on windows.

6

In my PC it doesn’t work with that change. Here is the result.

What is the return of this function slicer.app.os on mac?

7

Looks like file:/// is the right thing - it works on mac and should also work on windows.

But if you really need it:

>>> slicer.app.os
'macosx'
1 Like
8

There is no need to implement such low-level logic. You can simply use the QUrl class to get URL from local file path:

>>> qt.QUrl.fromLocalFile(r"c:\tmp").toString()
'file:///c:/tmp'
1 Like