How to change the gesture example application to load a different image after initial load

The sample application 'Gesture' is a good start for me, since I want to load and display a picture full screen.

However, my application needs to change the image that is displayed thereafter.

I managed to load the new JPEG image via:

...

io_stream_t * memory_stream = io_open (IO_MEM, IO_READ, num_jpeg_bytes, jpeg_bytes);

RC = img_load (ilib, memory_stream, & legends, &img);)

...

... but the new image is not displayed on the screen.  I guess that's because the decode_setup function that is used to load the image when the IPL does not have to then change the image, but I don't know how it should be changed.

I read:

https://bdsc.webapps.BlackBerry.com/native/reference/com.QNX.doc.libimg.lib_ref/com.QNX.doc.libimg.l...

... but it does not tell me something I already know.

I guess the question is this: If you load an image into a structure img_t, how can I take this img_t and update the screen to display the image full screen?

Thank you!

Daniel

Hi Daniel,.

The legend of decode_setup provided should load successfully all significant images in memory buffer rendering. However that alone does not display the image on the screen. You must call screen_post_window() after your call to img_load to make your changes in the visible rendering buffer.

See:

https://bdsc.webapps.BlackBerry.com/native/reference/com.QNX.doc.screen.lib_ref/topic/rscreen_post_w...

For more information, or the main() function of the sample of actions for an example.

Kind regards

Jeff

Tags: BlackBerry Developers

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