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Signature showing as black box in PDF report

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  • Signature showing as black box in PDF report

    I have a signature capture control which stores the signature in a blob field in a mysql database.

    When I load a report containing this signature, it appears as a black box. It works fine in the design preview, but when I publish it, the black box appears.

    I've tried different browsers, viewing localhost, etc but nothing seems to work. I'm using an HTML box in the report with the signature field inserted into it.


  • #2
    Re: Signature showing as black box in PDF report

    It's nothing to do with browsers, localhost, etc... but rather the "image" field itself.

    Instead of using an HTML box... "override" the image field from you SQL Source. I'll assume you've got your report in the Web Projects Control Panel.

    Right click on the report and choose SQL Datasource, Edit SQL Data Definition.

    Get to the dialog where you select your fields. At the bottom you'll see a hyperlink "Advanced Options"

    Check Override Field Defintions and then click Field Definitions.

    Double click your signature field and change it's field type to Png. The signature capture is saved as a png image... that's why this works.
    Last edited by Davidk; 01-25-2014, 11:35 AM.


    • #3
      Re: Signature showing as black box in PDF report

      Thanks for your help - signature showing fine on the report now!

      I'm still figuring out how to get it to display on a grid...I can't seem to get it to do this yet.

      Last edited by jrmplus; 01-25-2014, 08:03 AM.


      • #4
        Re: Signature showing as black box in PDF report

        In theory... displaying your field on a grid is almost exactly the same.

        Add your signature field from your Available Fields list. Once it's over in your Selected Fields list it should be represented as an image field.

        In it's properties, under Display Settings, find Display format which should, by default, read <BMP Field>. Click on the builder for this property and a Special Formats dialog will display.

        Click the Special Formats button and choose <PNG Field>. While you're in this dialog have a look at the Explain Formats link... good reading.

        Since the Signature Capture control saves it's contents in the PNG format... you just need to make sure that where ever you use it, you set your displaying control to use PNG.


        • #5
          Re: Signature showing as black box in PDF report

          So after updating to the most recent version of alpha anywhere (v4) I have encountered this problem again however I've checked the advanced settings to make sure nothing was changed and my signature fields were still set to PNG. Any other things I can look into what would start causing this in v4? So far haven't read anything about known bugs causing this issue.


          • #6
            Re: Signature showing as black box in PDF report

            It happened to me too. Worked fine until the update to v4.0.


            • #7
              Re: Signature showing as black box in PDF report

              So far I went to advanced options and tried Jpeg and BMP to see if going to those would work (assumed they wouldn't and they ended up just making the area blank rather than a black box). Hopefully a fix comes soon!


              • #8
                Re: Signature showing as black box in PDF report

                Selwyn helped me on this one. Make sure that the xps to pdf box is checked. Then shut down Alpha and start it again. This worked for the signature. However, the jpeg logo now has a problem.


                • #9
                  Re: Signature showing as black box in PDF report

                  I know I've seen that setting somewhere but I can't remember where, can you point me in the direction before I start pecking around for it haha hopefully save me a little time.


                  • #10
                    Re: Signature showing as black box in PDF report

                    Web Project Properties.PNG


                    • #11
                      Re: Signature showing as black box in PDF report

                      Lee, my new issue is having the black box show up when someone doesn't sign (which obviously I prefer to my signatures not showing up) but is there a chance you can test this to see if you are experiencing this issue as well so I know if it is potential bug or if I need to go digging through my report and find a fix for when a signature isn't captured.


                      • #12
                        Re: Signature showing as black box in PDF report

                        If it was working before v4.0 update I'd send it in as a bug report. I'm not having this issue.


                        • #13
                          Re: Signature showing as black box in PDF report

                          After reading this whole thread I still don't get it clear, were you experiencing so with the one very document or several variations of it? Because I was experiencing some issue appears to be similar to this of yours and it happened accidentally without any pattern. The only fix I found for such an occasion was to edit the report through this editor so signature fields are signaturable again. Maybe there's some broken version associations are having place


                          • #14
                            Re: Signature showing as black box in PDF report

                            hi, I experienced with this issue. To fix it :
                            1. use this method to display the signature in report:
                            - calculated field : signature_encoded = base64encode(authorisation_signature)
                            - Use html from toolbox, img src="data:image/png;base64,{signature_encoded}"
                            2. web project properties -> PDF Printing options > tick 'use microsoft xps' (or just tick 3 of them)