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Date Posted: 11:40:23 11/14/00 Tue
Author: James Wendell
Subject: Re: Get DIB Failed
In reply to: Michel 's message, "Re: Get DIB Failed" on 07:40:39 11/14/00 Tue

I thank you for the testing and the response. Could you tell me HOW you loaded ONLY a RESIZED image with your test project? I think I was doing essentially just that with my Thumbnail program, and still cannot get past 20 to 30 images loaded sequentially. In effect, I was loading each full-size (2048x1536 JPEG) image as a TDibGraphic in memory (one only), resizing it to 112x112 for display as a thumbnail, and then displaying it in a TImageScrollBox. I then DESTROYED the original 2048x1536 TDibGraphic BEFORE I loaded the next image and repeated the process. So I should NEVER be using more resources than what are required to load ONE (1) full size image at a time, while maintaining the memory for previously loaded 112x112 thumbnails.

I wonder how other thumbnail programs work, such as ACDSee and ImageExpert2000? I understand your argument about resource usage under Win9x and maybe Win2000 (which I plan to try soon), but how do other vendors make thumbnails work properly? Perhaps freeing the TDibGraphic leaves some sort of residual memory usage (a memory leak?) or other anomaly.........

I reecently tried another test using your sample demo program and the image (2048x1536) I sent you. Under Win98, if you load the image and then repeatedly lighten/darken the image while it is displayed, the SAME CreateDIBSection fail occurs. I think the error occurs here presumably because you are creating an "undo" image.

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