Loading and displaying images...

[Dan Soper]

Hi,

I'm having some difficulty persuading a bitmap image to display in a window created using DDT.

The image is on file - my app. is such that I'll need to change the image at run time, so I can't put it into a resource file.
So I can't use DDT's CONTROL ADD IMAGE statement... or can I? If I could use that, then change the image in the control to one from a .bmp file, that would be ideal.
Otherwise, does anyone have any source they could share showing how to put an image from a file onto a DDT dialog?

(The images I'll eventually be using are JPEGs of around 1200x800 pixels, which I'll want to display a thumbnail of width about 150 dialog units. At this point I'm trying to walk before I can run, and I have a bitmap image of 634x427 pixels as a test file. If I can get that to display, I'll be able to tackle the IJL library.)


Thanks,

Dan.

[Lance Edmonds]

The initial image needs to come from a resource file, but you can use CONTROL SET IMAGE(X) to change the image to one subsequently loaded from a disk file. Use CONTROL SEND... %STM_SETIMAGE to change the image at runtime.

Note that DDT does not release the previous image handle, so you may explicitly release it or you'll cause a memory leak:

CONTROL SEND CBHNDL, Id&, %STM_GETIMAGE, %IMAGE_BITMAP, 0 TO hBmp&
CONTROL SET IMAGE hDlg&, Id&, NewImage$ ' example uses ID from resource file.
DeleteObject hBmp&

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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Lance Edmonds]

One more point... if this image is for the background, then be sure to check out the SMTP.BAS example supplied with PB/DLL.

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Lance
PowerBASIC Support
mailto:[email protected][email protected]</A>

[Dan Soper]

I saw the SMTP example, but I'm not looking for a background image so that wasn't really applicable, nor (as I discovered) was it readily adaptable.

I'll have a play with CONTROL SET IMAGEX and CONTROL SEND tomorrow...

Thanks!

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--Dan