在文档中，它表示此方法返回的窗口列表：
CFArrayRef windowList = CGWindowListCopyWindowInfo(kCGWindowListOptionOnScreenOnly, kCGNullWindowID);
将按照从前到后的顺序返回窗口。但它没有......最前面的窗口应该是测试，但是这里有这个数组：
2011-03-12 18:18:14.221 test[982:a0f] (
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 22;
Width = 212;
X = 1662;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 25;
kCGWindowMemoryUsage = 30104;
kCGWindowName = "";
kCGWindowNumber = 14;
kCGWindowOwnerName = SystemUIServer;
kCGWindowOwnerPID = 99;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 0;
kCGWindowBounds = {
Height = 22;
Width = 1920;
X = 0;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 25;
kCGWindowMemoryUsage = 5528;
kCGWindowNumber = 15;
kCGWindowOwnerName = SystemUIServer;
kCGWindowOwnerPID = 99;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 22;
Width = 46;
X = 1874;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 25;
kCGWindowMemoryUsage = 5528;
kCGWindowName = "";
kCGWindowNumber = 12;
kCGWindowOwnerName = SystemUIServer;
kCGWindowOwnerPID = 99;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 22;
Width = 1920;
X = 0;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 24;
kCGWindowMemoryUsage = 218520;
kCGWindowName = "Shared Menubar";
kCGWindowNumber = 6;
kCGWindowOwnerName = "Window Server";
kCGWindowOwnerPID = 73;
kCGWindowSharingState = 2;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 1058;
Width = 1920;
X = 0;
Y = 22;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 20;
kCGWindowMemoryUsage = 1200;
kCGWindowNumber = 13;
kCGWindowOwnerName = Dock;
kCGWindowOwnerPID = 98;
kCGWindowSharingState = 1;
kCGWindowStoreType = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 52;
Width = 676;
X = 622;
Y = 1028;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 19;
kCGWindowMemoryUsage = 157080;
kCGWindowName = "Magic Mirror";
kCGWindowNumber = 16;
kCGWindowOwnerName = Dock;
kCGWindowOwnerPID = 98;
kCGWindowSharingState = 2;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 382;
Width = 480;
X = 335;
Y = 367;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 792496;
kCGWindowName = test;
kCGWindowNumber = 252;
kCGWindowOwnerName = test;
kCGWindowOwnerPID = 982;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 807;
Width = 1206;
X = 321;
Y = 157;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 4055280;
kCGWindowName = "AppDelegate.m - test";
kCGWindowNumber = 24;
kCGWindowOwnerName = Xcode;
kCGWindowOwnerPID = 132;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 967;
Width = 960;
X = 175;
Y = 22;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 3817968;
kCGWindowName = "test - Debugger Console";
kCGWindowNumber = 31;
kCGWindowOwnerName = Xcode;
kCGWindowOwnerPID = 132;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 967;
Width = 1845;
X = 121;
Y = 22;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 882288;
kCGWindowName = "CocoaDev Forums - get focused window id";
kCGWindowNumber = 80;
kCGWindowOwnerName = "Google Chrome";
kCGWindowOwnerPID = 244;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 784;
Width = 885;
X = 560;
Y = 157;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 318768;
kCGWindowName = "Console Messages";
kCGWindowNumber = 125;
kCGWindowOwnerName = Console;
kCGWindowOwnerPID = 482;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 494;
Width = 1167;
X = 519;
Y = 417;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 2441264;
kCGWindowName = Debug;
kCGWindowNumber = 54;
kCGWindowOwnerName = Finder;
kCGWindowOwnerPID = 100;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 382;
Width = 480;
X = 335;
Y = 367;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 55216;
kCGWindowName = test;
kCGWindowNumber = 223;
kCGWindowOwnerName = test;
kCGWindowOwnerPID = 849;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 437;
Width = 770;
X = 396;
Y = 308;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 238512;
kCGWindowName = Applications;
kCGWindowNumber = 19;
kCGWindowOwnerName = Finder;
kCGWindowOwnerPID = 100;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 437;
Width = 770;
X = 450;
Y = 429;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = 0;
kCGWindowMemoryUsage = 332720;
kCGWindowName = Applications;
kCGWindowNumber = 17;
kCGWindowOwnerName = Finder;
kCGWindowOwnerPID = 100;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
kCGWindowWorkspace = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 14;
Width = 1920;
X = 0;
Y = 22;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = "-20";
kCGWindowMemoryUsage = 5528;
kCGWindowName = "Backstop Menubar";
kCGWindowNumber = 11;
kCGWindowOwnerName = "Window Server";
kCGWindowOwnerPID = 73;
kCGWindowSharingState = 1;
kCGWindowStoreType = 2;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 1080;
Width = 1920;
X = 0;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = "-2147483627";
kCGWindowMemoryUsage = 1200;
kCGWindowName = "";
kCGWindowNumber = 10;
kCGWindowOwnerName = Finder;
kCGWindowOwnerPID = 100;
kCGWindowSharingState = 1;
kCGWindowStoreType = 1;
},
{
kCGWindowAlpha = 1;
kCGWindowBounds = {
Height = 1080;
Width = 1920;
X = 0;
Y = 0;
};
kCGWindowIsOnscreen = 1;
kCGWindowLayer = "-2147483628";
kCGWindowMemoryUsage = 8328600;
kCGWindowName = Desktop;
kCGWindowNumber = 2;
kCGWindowOwnerName = "Window Server";
kCGWindowOwnerPID = 73;
kCGWindowSharingState = 2;
kCGWindowStoreType = 2;
}
)
什么是SystemUIServer，底座和魔镜？这些不是我最前面的应用程序。谢谢！
答案 0 :(得分：20)
获取Apple的示例应用程序副本：Son Of Grab。然后构建并运行它，你将有一个非常方便的交互式应用程序来调查窗口服务器已知的所有窗口。
您的问题的答案是窗口是从前到后排序的，但是有更多的用户界面元素被定义为窗口，而不是您期望的。这包括菜单栏，停靠栏，服务菜单，桌面等。这些是在不同级别定义的，对应于输出中的kCGWindowLayer。
您希望在标准窗口级别（零）定义第一个窗口。如果你查看输出，kCGWindowLayer == 0的第一个窗口实际上是第7个。
答案 1 :(得分：1)
SystemUIServer是顶部菜单栏。 Dock是Dock（通常位于屏幕的底部）。我不熟悉“魔镜”。您可以使用lsregister在您的系统中查找它：
`locate lsregister` -dump
在输出中搜索“Magic Mirror”。