SetPreviewSize takes an enumeration constant like
kCamLibImageSizeQVGA, while SetPreviewRect takes a rect which shows
where on the screen it goes. (It doesn't have to be at the top, nor
centered, but does have to be all on the screen.)
The preview rect is set in screen coordinates, not native
coordinates, so a 320x240 camera preview needs a 160x120 rectangle
passed to SetPreviewRect.
On Sep 17, 2007, at 5:09 PM, Stefan Mohr wrote:
I'm working off the CameraV3 sample code provided by Palm and am
trying to restrict the bounds of the preview to less than full screen.
This is working great on the hacked Zire 71 sim but when I try it
on a Treo 700p I'm unable to see the preview screen at all.
My code is essentially doing this:
// photo lib init
RectangleType previewRect;
previewRect.bounds.topleft.x = .....
// set all preview bounds
SetPreviewRect( photoLibRefNum, &previewRect );
TurnPreviewOn( photoLibRefNum, oldPhotoLibrary );
Both the sim and device are using the "new" photo library, so it
doesn't appear to be a difference in the version of the library.
If I remove the SetPreviewRect() call everything works wonderfully
on the device.
Any thoughts? The only other preview-related call I know I can make
is SetPreviewSize() which takes an Int32. I have a feeling this is
related to color depth and not preview dimensions but haven't found
very good documentation on the various CamlibControl() params.
Can anyone with more experience using the camera give me any advice?
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