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Date Posted: 07:40:39 11/14/00 Tue
Author: Michel
Subject: Re: Get DIB Failed
In reply to: James Wendell 's message, "Re: Get DIB Failed" on 13:41:22 11/03/00 Fri


I have done more testing on this. There are two issues to this. The first is that there is a

limit on the size of a single image (with Windows 9.X having more difficulty with larger

images).

The other is a problem with resources. This is the problem experienced with James's and

Martin's sample projects (thumbnail viewers). Windows simply cannot allocate very many GDI

resources with dealing with large graphics. In a test project, where I simply create TJpegGraphic's and store them in a list

(not even displayed on screen), Win98 failed after 36 images, and Win2000 failed after 49. This

is on a computer with 128Mb of ram. Each JPEG image was 710Kb, which uncompresses to a fairly

large image (2048x1536 true color). For thumbnail viewers, this means that the original image

should not be loaded, but only a resized one. After testing, Win2000 was able to load 4986 small images (100x75) before running out of resources.

Best regards,

Michel




> Michel, I have emailed you a copy of my thumbnail test
> program which clearly shows that the "CreateDibGraphic
> fail" message will appear at random while loading a
> series of IDENTICAL images with different names,
> usually after loading about 20 or more images in a
> directory. I really think that we all need a way
> around the Windows API call. I know that Larry
> Griffiths recommended another technique. How about
> DirectX or DirectDraw. Are there ways to create a DIB
> using these calls? In any event, I would appreciate
> any comments after you have tested my program. If
> necessary, I can provide you with more images. Thanks.

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