LispWorks CAPI User Guide > 12 Graphics Ports > 12.8 Working with images

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12.8.5 Querying image dimensions

To obtain the pixel dimensions of an image, load the image using load-image and then use the readers image-width and image-height . The first argument to load-image must be a pane in a displayed interface.

To query the dimensions before displaying anything you can create and "display" an interface made with the :display-state :hidden initarg. Call load-image with this hidden interface and your external-image object, and then use the readers image-width and image-height .


LispWorks CAPI User Guide (Windows version) - 22 Dec 2009

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