给定窗口ID,确定窗口所在的屏幕

Question

NSScreen假设我有窗口ID,有没有办法获得另一个进程的窗口？

我与以下代码非常接近,但信息字典没有说明窗口在哪个屏幕上.

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);

来自:CGWindowListCopyWindowInfo,kCGWindowLayer和窗口级别

这里输出:

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;

我可以尝试从窗口边界计算屏幕,但我想知道是否有更好的方法.

Answer 1

此信息不可用的原因可能是因为一个窗口可以同时出现在多个屏幕上。如果用户拖动窗口，使其一部分位于一个窗口中，其余部分位于另一个窗口中，则不存在当前屏幕这样的东西。

您的窗口边界估计方法可能是最好的选择。