Re: QTNewGWorld

Subject: Re: QTNewGWorld
From: Steve Christensen <email@hidden>
Date: Mon, 16 Oct 2006 12:42:54 -0700
Delivered-to: email@hidden
Delivered-to: email@hidden

On Oct 16, 2006, at 11:24 AM, Matt wrote:

I'm trying to create/use an offscreen buffer for a
movie.  BTW, "theMovie" referenced below was created
with no errors using "NewMovieFromDataRef"

I'm getting a crash in "SetMovieGWorld" after I create
the GWorld using "QTNewGWorld".

Here's my code:

// ----
void** ppOutGWorld; // off-screen buffer
Rect theBounds = {0,0,242,192};
err = QTNewGWorld(
  (GWorldPtr*)ppOutGWorld,
  k32ARGBPixelFormat, &theBounds, NULL, NULL, 0);

if (noErr == err)
 LockPixels(
  GetGWorldPixMap(*(GWorldPtr*)appOutGWorld));

// set the movie to draw into that GWorld.
SetMovieGWorld(theMovie,
 *(*(GWorldPtr**)appOutGWorld), nil);
// ----

Can anybody help me here?


Not knowing anything else, I noticed two things in your code above:

1. ppOutGWorld is a void** instead of a GWorldPtr, which you then have to repeatedly cast. Any reason you couldn't just use the proper data type?

2. SetMovieGWorld is not bounded by the check to see that the GWorld was successfully created. You shouldn't be doing -anything- with that GWorld unless QTNewGWorld succeeded.

_______________________________________________
Do not post admin requests to the list. They will be ignored.
QuickTime-API mailing list      (email@hidden)
Help/Unsubscribe/Update your Subscription:
This email sent to email@hidden



References:  
  >QTNewGWorld (From: Matt <email@hidden>)




Prev by Date:
Re: QTNewGWorld

Next by Date:
Re: QTNewGWorld

Previous by thread:
Re: QTNewGWorld

Next by thread:
Universal component help ...

Index(es):

Date
Thread













  
   Home
   Archives
   Terms/Conditions
   Contact
   RSS
   Lists
   About
 






Visit the Apple Store online or at retail locations.

1-800-MY-APPLE
Contact Apple | Terms of Use | Privacy Policy
Copyright © 2011 Apple Inc. All rights reserved.