我正在尝试使用此代码获取应用程序大小:
[DllImport(@"dwmapi.dll")]
private static extern int DwmGetWindowAttribute(IntPtr hwnd, int dwAttribute, out Rect pvAttribute, int cbAttribute);
[Serializable, StructLayout(LayoutKind.Sequential)]
private struct Rect
{
public int Left;
public int Top;
public int Right;
public int Bottom;
public Rectangle ToRectangle()
{
return Rectangle.FromLTRB(Left, Top, Right, Bottom);
}
}
private static bool DWMWA_EXTENDED_FRAME_BOUNDS(IntPtr handle, out Rectangle rectangle)
{
Rect rect;
var result = DwmGetWindowAttribute(handle, (int)Dwmwindowattribute.DwmwaExtendedFrameBounds,
out rect, Marshal.SizeOf(typeof(Rect)));
rectangle = rect.ToRectangle();
return result >= 0;
}
它适用于所有正在运行的应用程序,但如果它是全屏模式的Media Player,我没有得到正确的Rect大小。
Windows Media Player在全屏模式下很奇怪,因此主窗口句柄与显示的全屏窗口不对应。全屏窗口仍然有一个句柄,但需要更多的工作才能到达它。
首先,您需要声明一些WinAPI函数和结构:
delegate bool EnumWindowsProc(IntPtr hwnd, IntPtr lParam);
[DllImport("User32.dll")]
static extern bool EnumWindows(EnumWindowsProc lpEnumFunc, IntPtr lParam);
[DllImport("User32.dll")]
static extern bool GetMonitorInfo(IntPtr hMonitor, ref MonitorInfo lpmi);
[DllImport("User32.dll")]
static extern uint GetWindowThreadProcessId(IntPtr hWnd, out uint lpdwProcessId);
[DllImport("User32.dll")]
static extern IntPtr MonitorFromWindow(IntPtr hwnd, uint dwFlags);
[StructLayout(LayoutKind.Sequential)]
struct MonitorInfo
{
public uint Size;
public Rect Monitor;
public Rect Work;
public uint Flags;
}
// You seem to have this one already
[StructLayout(LayoutKind.Sequential)]
struct Rect
{
public int Left;
public int Top;
public int Right;
public int Bottom;
}
从那里,该方法如下所示:
// Pass Windows Media Player's main window handle here.
static bool GetWmpFullScreenHandle(IntPtr mainHandle, out IntPtr fullScreenHandle)
{
IntPtr tempHandle = IntPtr.Zero;
// Getting WMP's PID from the main window handle.
GetWindowThreadProcessId(mainHandle, out uint wmpProcessId);
// Optionally, check if the PID resolves to a WMP process.
if (System.Diagnostics.Process.GetProcessById(wmpProcessId).ProcessName != "wmplayer")
{
fullScreenHandle = IntPtr.Zero;
return false;
}
// This iterates through all the open window handles on the machine
// and passes them to the callback below.
EnumWindows((hWnd, lParam) =>
{
// Getting the window handle's PID.
GetWindowThreadProcessId(hWnd, out uint windowProcessId);
// Checking if the window handle belongs to the WMP process.
if (windowProcessId == wmpProcessId)
{
var monitorInfo = new MonitorInfo
{
Size = Convert.ToUInt32(Marshal.SizeOf(typeof(MonitorInfo)))
};
// Getting the dimensions of the monitor the window is displayed on,
// as well as the window dimensions.
if (GetMonitorInfo(MonitorFromWindow(hWnd, 0), ref monitorInfo) &&
GetWindowRect(hWnd, out Rect windowRect))
{
Rect monitorRect = monitorInfo.Monitor;
// If the window dimensions are the same as its monitor's
// dimensions, then we found a hidden full-screen window!
if (windowRect.Left == monitorRect.Left &&
windowRect.Top == monitorRect.Top &&
windowRect.Right == monitorRect.Right &&
windowRect.Bottom == monitorRect.Bottom)
{
tempHandle = hWnd;
}
}
}
return true;
},
IntPtr.Zero);
fullScreenHandle = tempHandle;
// Returns true if the hidden full-screen handle was found, false otherwise.
return fullScreenHandle != IntPtr.Zero;
}
如果找到,您可以将生成的句柄传递给DWMWA_EXTENDED_FRAME_BOUNDS
以获取Rectangle
。