在手动生成的线程上调用UIGetScreenImage()将打印“NSAutoreleaseNoPool():”消息以记录

这是在中指定的选择器的主体 NSThread +detachNewThreadSelector:(SEL)aSelector toTarget:(id)aTarget withObject:(id)anArgument

    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    while (doIt)
    {
        if (doItForSure)
        {
            NSLog(@"checking");
            doItForSure = NO;

            (void)gettimeofday(&start, NULL);

            /* 
                do some stuff   */

            // the next line prints "_NSAutoreleaseNoPool():" message to the log
            CGImageRef screenImage = UIGetScreenImage();


            /*
                do some other stuff */

            (void)gettimeofday(&end, NULL);

            elapsed = ((double)(end.tv_sec) + (double)(end.tv_usec) / 1000000) - ((double)(start.tv_sec) + (double)(start.tv_usec) / 1000000);

            NSLog(@"Time elapsed: %e", elapsed);

            [pool drain];
        }
    }

    [pool release];

即使存在自动释放池,我也会在调用时将此打印到日志中 UIGetScreenImage() :

2010-05-03 11:39:04.588 ProjectName[763:5903] *** _NSAutoreleaseNoPool(): Object 0x15a2e0 of class NSCFNumber autoreleased with no pool in place - just leaking

有没有其他人看过这个 UIGetScreenImage() 在另一条线上?