原理主要是获取窗口的样式来判断是否会在Alt+Tab中显示
具体代码如下
/// <summary>
/// Alt+Tab 应用
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
public static bool IsAltTabWindow(IntPtr hWnd)
{
// The window must be visible
if (!IsWindowVisible(hWnd))
return false; // The window must be a root owner
if (GetAncestor(hWnd, GA_ROOTOWNER) != hWnd)
return false; // The window must not be cloaked by the shell
DwmGetWindowAttribute(hWnd, DwmWindowAttribute.DWMWA_CLOAKED, out int cloaked, sizeof(uint));
if (cloaked == DWM_CLOAKED_SHELL)
return false; // The window must not have the extended style WS_EX_TOOLWINDOW
int style = Utils.Win32Api.GetWindowLong(hWnd, GWL_EXSTYLE);
if ((style & WS_EX_TOOLWINDOW) != 0)
return false; return true;
} [DllImport("User32.dll", CharSet = CharSet.Auto)]
public static extern bool IsWindowVisible(IntPtr hWnd); [DllImport("user32.dll")]
public static extern IntPtr GetAncestor(IntPtr hWnd, uint gaFlags);
[DllImport("dwmapi.dll")]
public static extern int DwmGetWindowAttribute(IntPtr hwnd, DwmWindowAttribute dwAttribute, out int attrValue, int cbAttribute); const uint DWM_CLOAKED_SHELL = 0x00000002;
const uint GA_ROOTOWNER = 3; const uint WS_EX_TOPMOST = 0x00000008; [Flags]
public enum DwmWindowAttribute : uint
{
DWMWA_NCRENDERING_ENABLED = 1,
DWMWA_NCRENDERING_POLICY,
DWMWA_TRANSITIONS_FORCEDISABLED,
DWMWA_ALLOW_NCPAINT,
DWMWA_CAPTION_BUTTON_BOUNDS,
DWMWA_NONCLIENT_RTL_LAYOUT,
DWMWA_FORCE_ICONIC_REPRESENTATION,
DWMWA_FLIP3D_POLICY,
DWMWA_EXTENDED_FRAME_BOUNDS,
DWMWA_HAS_ICONIC_BITMAP,
DWMWA_DISALLOW_PEEK,
DWMWA_EXCLUDED_FROM_PEEK,
DWMWA_CLOAK,
DWMWA_CLOAKED,
DWMWA_FREEZE_REPRESENTATION,
DWMWA_LAST
}
/// <summary>
/// 获取窗体句柄
/// </summary>
/// <param name="hwnd"></param>
/// <param name="nIndex"></param>
/// <returns></returns>
[DllImport("user32.dll", EntryPoint = "GetWindowLongA", SetLastError = true)]
public static extern int GetWindowLong(IntPtr hwnd, int nIndex); const int GWL_EXSTYLE = -20;//得到扩展的窗口风格
public const int WS_EX_TOOLWINDOW = 0x00000080;
以上方式对于全屏的UWP窗口时无法获取得到的，因此需要引入以下方式获取全屏UWP窗口
/// <summary>
/// 全屏的UWP应用
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
public static bool IsFullScreenUwpWindows(IntPtr hWnd)
{
// Get the extended style of the window
var style = GetWindowLong(hWnd, GWL_EXSTYLE); // The window must have the extended style WS_EX_TOPMOST
if ((style & WS_EX_TOPMOST) == 0)
return false; // The window must not have the extended style WS_EX_NOACTIVATE
if ((style & WS_EX_NOACTIVATE) != 0)
return false; // The window must not have the extended style WS_EX_TOOLWINDOW
if ((style & WS_EX_TOOLWINDOW) != 0)
return false; return true;
} public const int WS_EX_NOACTIVATE = 0x08000000;
然后通过枚举窗口的方式就可以获取到所有窗口了
/// <summary>
/// 枚举窗体的回调
/// </summary>
/// <param name="hwnd"></param>
/// <param name="lParam"></param>
/// <returns></returns>
public delegate bool EnumWindowsCallBack(IntPtr hwnd, IntPtr lParam);
/// <summary>
/// 枚举出窗体
/// </summary>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
[DllImport("user32")]
public static extern int EnumWindows(EnumWindowsCallBack x, IntPtr y); /// <summary>
/// 枚举子窗口
/// </summary>
/// <param name="hWndParent"></param>
/// <param name="x"></param>
/// <param name="y"></param>
/// <returns></returns>
[DllImport("user32")]
public static extern int EnumChildWindows(IntPtr hWndParent, EnumWindowsCallBack x, IntPtr y);
List<KeyValuePair<IntPtr, string>> handles = new List<KeyValuePair<IntPtr, string>>();
EnumWindows((hWnd, lPam) =>
{
if (!IsAltTabWindow(hWnd)) return true;//继续枚举
var title = GetWindowTitle(hWnd);
handles.Add(new KeyValuePair<IntPtr, string>(hWnd, title));
return true;//继续枚举
}, IntPtr.Zero); EnumChildWindows(GetDesktopWindow(), (hWnd, lPam) =>
{
if (handles.Any(kv => kv.Key == hWnd)||!IsFullScreenUwpWindows(hWnd)) return true;//继续枚举
var title = GetWindowTitle(hWnd);
handles.Add(new KeyValuePair<IntPtr, string>(hWnd, title));
return true;//继续枚举
}, IntPtr.Zero); [DllImport("user32.dll")]
public static extern IntPtr GetDesktopWindow();
/// <summary>
/// 获取窗体的名称
/// </summary>
/// <param name="hWnd"></param>
/// <param name="lpString"></param>
/// <param name="nMaxCount"></param>
/// <returns></returns>
[DllImport("user32.dll")]
public static extern int GetWindowTextW(IntPtr hWnd, IntPtr lpString, int nMaxCount); /// <summary>
/// 默认获取字符串的长度
/// </summary>
private const int NumChars = 256;
public static string GetWindowTitle(IntPtr hwnd)
{
IntPtr intPtr = Marshal.AllocHGlobal(NumChars);
Utils.Win32Api.GetWindowTextW(hwnd, intPtr, 100);
var s = Marshal.PtrToStringUni(intPtr);
Marshal.FreeHGlobal(intPtr);
return s;
}
以上代码需要做调整才能运行起来，有空我补上完整代码
参考：https://stackoverflow.com/questions/72069771/show-a-list-of-all-alttab-windows-even-full-screen-uwp-windows-and-retrieve
