Setup a PtTimer that checks a "image index" ... after the callback for the PtTimer fires, check the "image index" for 
what image to display, and set the Pt_ARG_LABEL_IMAGE with that image, then change the "image index".  The next time the
 PtTimer fires, your "image index" will be different, so you would set the other image to the label.

Preload the image (PxLoadImage) in an application startup callback, you do not want to keep reloading the images -> slow
, and if you do not release, leads to memory leak.

-----Original Message-----
From: Frank Applin [mailto:community-noreply@qnx.com] 
Sent: July-26-12 11:51 AM
To: photon-graphics
Subject: How to swap images using a label

Hi,

I'm new to QNX and PhAB, but have been programming for 20+ years. I guess I'm most familiar with the Visual Studio 
paradigm. 

I am using Neil Carter's example of showing an image using a label.

int ShowImage( PtWidget_t *widget, ApInfo_t *apinfo, PtCallbackInfo_t *cbinfo ) {
   
   PhImage_t   *myImg;
   char        myImgFlnm[20] = "PICTURE.BMP";

   /* eliminate 'unreferenced' warnings */
   widget = widget, apinfo = apinfo, cbinfo = cbinfo;
    
   if ((myImg = PxLoadImage( myImgFlnm, NULL)) == NULL) {
      fprintf( stderr, "Error loading image file %s\n", myImgFlnm);
      PtExit( EXIT_FAILURE );
   }
   PtSetResource(ABW_lblMyImg, Pt_ARG_LABEL_IMAGE, myImg, 0);
    
   return( Pt_CONTINUE );
}

How can I swap out the current image with another image after a short delay?

I tried the following, but it simple shows the 2nd image:

int ShowImage( PtWidget_t *widget, ApInfo_t *apinfo, PtCallbackInfo_t *cbinfo ) {
   
   PhImage_t   *myImg, *myImg2;
   char        myImgFlnm[20] = "PICTURE.BMP";
   char        myImgFlnm2[20] = "PICTURE2.BMP";

   /* eliminate 'unreferenced' warnings */
   widget = widget, apinfo = apinfo, cbinfo = cbinfo;
    
   if ((myImg = PxLoadImage( myImgFlnm, NULL)) == NULL) {
      fprintf( stderr, "Error loading image file %s\n", myImgFlnm);
      PtExit( EXIT_FAILURE );
   }
   PtSetResource(ABW_lblMyImg, Pt_ARG_LABEL_IMAGE, myImg, 0);

   delay(5000); /* delay 5 secs */

   if ((myImg2 = PxLoadImage( myImgFlnm2, NULL)) == NULL) {
      fprintf( stderr, "Error loading image file %s\n", myImgFlnm2);
      PtExit( EXIT_FAILURE );
   }
   PtSetResource(ABW_lblMyImg, Pt_ARG_LABEL_IMAGE, myImg2, 0);

    
   return( Pt_CONTINUE );
}


Thanks,

Frank




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Photon microGUI
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