I need help - I can help - "Phantom" Images

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"Phantom" Images

Printed From: Debenu Quick PDF Library - PDF SDK Community Forum
Category: For Users of the Library
Forum Name: I need help - I can help
Forum Description: Problems and solutions while programming with the Debenu Quick PDF Library and Debenu PDF Viewer SDK
URL: http://www.quickpdf.org/forum/forum_posts.asp?TID=3614
Printed Date: 22 Nov 24 at 1:43PM
Software Version: Web Wiz Forums 11.01 - http://www.webwizforums.com

Topic: "Phantom" Images

Posted By: John Whitham
Subject: "Phantom" Images
Date Posted: 04 Oct 18 at 4:38PM

I use the following code in a MouseUp event on a TPaintbox to find if the user has selected an image in the underlying pdf

...imgl := pdfdoc.GetPageImageList(0);

if imgl > 0 then

begin

dpi := paintbox2.Height / (pdfdoc.PageHeight /25.4);

curpos := point(x,y);

cx := curpos.X / dpi * 25.4;

cy := curpos.Y / dpi * 25.4;

for i := 1 to pdfdoc.GetImageListCount(imgl) do

begin

il := pdfdoc.GetImageListItemDblProperty(imgl,i,501);

it := pdfdoc.GetImageListItemDblProperty(imgl,i,502);

ir := pdfdoc.GetImageListItemDblProperty(imgl,i,503);

ib := pdfdoc.GetImageListItemDblProperty(imgl,i,506);

if (cx >= il) and (cx <= ir) and (cy >= it) and (cy <= ib) then

break;

end;

if i <= pdfdoc.GetImageListCount(imgl) then...

this works fine initially, but after calling pdfdoc.ClearImage() on some moved or deletedimages it starts finding images where there are none. I suspect it finds where they used to be. Can anyone confirm this?

Replies:

Posted By: John Whitham
Date Posted: 04 Oct 18 at 4:44PM

Replying to myself as no edit function: Delphi 10.2.3 Tokyo and QuickPDF 13.12

Posted By: John Whitham
Date Posted: 04 Oct 18 at 5:49PM

Solved it! pdfdoc.GetImageListItemIntProperty(imgl,i,401) returns 1 on a cleared image so it can be discounted.