Determine which screen the window is on, given the window identifier

Question

Is there a way to get NSScreenanother process for a window, assuming I have a window id?

I got pretty close with the following code, but the info dictionary doesn't say which screen the window is on.

CFArrayRef windowArray = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
NSArray*  windowList = (NSArray*)CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
NSUInteger count = [windowList count];
for (NSUInteger i = 0; i < count; i++)
{
    NSDictionary*   nswindowsdescription = [windowList objectAtIndex:i];
    NSNumber* windowid = (NSNumber*)[nswindowsdescription objectForKey:@"kCGWindowNumber"];
    if(windowid)
    {
        if ([windowid integerValue] == appWeAreLookingForWindowId)
        {
            Warning(@"Found it: %@", nswindowsdescription);
        }
    }
}
CFRelease(windowArray);

From: CGWindowListCopyWindowInfo, kCGWindowLayer and window level

Here's the conclusion:

kCGWindowAlpha = 1;
kCGWindowBounds =     {
    Height = 1010;
    Width = 1600;
    X = 284;
    Y = 43;
};
kCGWindowIsOnscreen = 1; // This is not the screen id, by the way
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 7709736;
kCGWindowName = "osx - CGWindowListCopyWindowInfo, kCGWindowLayer and window level - Stack Overflow";
kCGWindowNumber = 4000;
kCGWindowOwnerName = Safari;
kCGWindowOwnerPID = 240;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;

I might try to compute a screen from window borders, but I wonder if there is a better way.

Answer 1

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