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POCan't detect color of a pixel in a pixel that... changes color
 

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  1. POCan't detect color of a pixel in a pixel that... changes color
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    <p>I am trying to create an application that when the color of a pixel on screen changes to another one (that I know what it is) it does something, doesn't really matter to the question what it does.</p> <p>Anyway, I am using this:</p> <pre><code> CGImageRef window283x420 = CGWindowListCreateImage(NSMakeRect(284, 420, 1, 1), kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault); NSBitmapImageRep *cannonOne = [[NSBitmapImageRep alloc] initWithCGImage:window283x420]; </code></pre> <p>Then, the color I am expecting it to change to here:</p> <pre><code>NSColor *color = [NSColor colorWithCalibratedRed:0.521569 green:0.380392 blue:0.231373 alpha:1]; </code></pre> <p>And am comparing the colors here:</p> <pre><code>while (![color isEqualToColor:[cannonOne colorAtX:0 y:0]]) { CGImageRef window283x420 = CGWindowListCreateImage(NSMakeRect(284, 420, 1, 1), kCGWindowListOptionOnScreenOnly, kCGNullWindowID, kCGWindowImageDefault); NSBitmapImageRep *cannonOne = [[NSBitmapImageRep alloc] initWithCGImage:window283x420]; if ([color isEqualToColor:[cannonOne colorAtX:0 y:0]]) { </code></pre> <p>I know the while/if part could be done better, but it should work just fine and not worrying about optimizing the app until it actually works lol.</p> <p>Now, if for example the color of the pixel doesn't actually change fast (like the color stays like that for a bit) it works perfectly. If it is like a pixel with a color that moves around and reaches 283*420 but doesn't stay there for long (like 0.1s) (as described in the example above) it doesn't work.</p> <p>The time it stays there shouldn't be a problem, as my app is checking the pixel really fast, as seen in the debug here:</p> <pre><code>2010-01-04 22:12:58.230 appname[2372:a0f] Checked 2010-01-04 22:12:58.231 appname[2372:a0f] Checked </code></pre> <p>Any ideas? :)</p>
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    1. USEduAlm
    1. USEduAlm
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    2. VO
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      1. VTUpMod
    1. COIs there anything else in that while statement besides the if statement? If not, how would anything inside that if statement ever execute?
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      1. POCan't detect color of a pixel in a pixel that... changes color
      1. USJeff Kelley
    2. CO@Jeff: Lol, you actually have a point there. I fixed that, but stil doesn't work correctly.
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