Изменение ориентации Windows 8.1 Рабочий стол с C# wpf

Question

Можно ли изменить ориентацию рабочих столов Windows 8.1 или Windows 7 через программу C# .. как от пейзажа к портрету, если я выбираю его из своего приложения?

Я знаю, что мы можем получить информацию о ширине и высоте экранов от класса Screen в пространстве имен System.Windows.Forms.

Но есть ли API, который я могу вызвать, чтобы изменить ориентацию.

Answer 1

Существует одно решение содержится в MSDN

Я использовал тот же кусок кода для WPF. Ниже приведен код

View.xaml

<Window x:Class="ScreenOrientation.MainWindow" 
     xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Title="MainWindow" Height="350" Width="525"> 
    <StackPanel Orientation="Horizontal" MaxHeight="55px" VerticalAlignment="Top"> 
     <Label Content="Change Orientation" Margin="5"></Label> 
     <Button Content="Rotate Clock Wise" Margin="5" x:Name="BtnClockwise" Click="BtnClockwise_OnClick"></Button> 
     <Button Content="Rotate Anti Clock Wise" Margin="5" x:Name="BtnAntiClock" Click="BtnAntiClock_OnClick"></Button> 
    </StackPanel> 
</Window> 

Код За

public partial class MainWindow : Window 
{ 
    private int[] orientationValues = new int[4]{NativeMethods.DMDO_DEFAULT, 
                NativeMethods.DMDO_90, 
                NativeMethods.DMDO_180, 
                NativeMethods.DMDO_270}; 
    public MainWindow() 
    { 
     InitializeComponent(); 
    } 

    private void BtnClockwise_OnClick(object sender, RoutedEventArgs e) 
    { 
     // obtain current settings 
     DEVMODE dm = NativeMethods.CreateDevmode(); 
     GetSettings(ref dm); 

     // swap height and width 
     int temp = dm.dmPelsHeight; 
     dm.dmPelsHeight = dm.dmPelsWidth; 
     dm.dmPelsWidth = temp; 

     // set the orientation value to what's next anti-clockwise 
     int index = Array.IndexOf(orientationValues, (object)dm.dmDisplayOrientation); 
     int newIndex = (index == 3) ? 0 : index + 1; 
     dm.dmDisplayOrientation = orientationValues[newIndex]; 

     // switch to new settings 
     ChangeSettings(dm); 
    } 

    private void BtnAntiClock_OnClick(object sender, RoutedEventArgs e) 
    { 
     // obtain current settings 
     DEVMODE dm = NativeMethods.CreateDevmode(); 
     GetSettings(ref dm); 

     // swap height and width 
     int temp = dm.dmPelsHeight; 
     dm.dmPelsHeight = dm.dmPelsWidth; 
     dm.dmPelsWidth = temp; 

     // set the orientation value to what's next anti-clockwise 
     int index = Array.IndexOf(orientationValues, (object)dm.dmDisplayOrientation); 
     int newIndex = (index == 3) ? 0 : index + 1; 
     dm.dmDisplayOrientation = orientationValues[newIndex]; 

     // switch to new settings 
     ChangeSettings(dm); 
    } 


    private int GetSettings(ref DEVMODE dm) 
    { 
     // helper to obtain current settings 
     return GetSettings(ref dm, NativeMethods.ENUM_CURRENT_SETTINGS); 
    } 

    private int GetSettings(ref DEVMODE dm, int iModeNum) 
    { 
     // helper to wrap EnumDisplaySettings Win32 API 
     return NativeMethods.EnumDisplaySettings(null, iModeNum, ref dm); 
    } 

    private void ChangeSettings(DEVMODE dm) 
    { 
     // helper to wrap ChangeDisplaySettings Win32 API 
     int iRet = NativeMethods.ChangeDisplaySettings(ref dm, 0); 
     switch (iRet) 
     { 
      case NativeMethods.DISP_CHANGE_SUCCESSFUL: 
       break; 
      case NativeMethods.DISP_CHANGE_RESTART: 
       MessageBox.Show("Please restart your system"); 
       break; 
      case NativeMethods.DISP_CHANGE_FAILED: 
       MessageBox.Show("ChangeDisplaySettigns API failed"); 
       break; 
      case NativeMethods.DISP_CHANGE_BADDUALVIEW: 
       MessageBox.Show("The settings change was unsuccessful because system is DualView capable."); 
       break; 
      case NativeMethods.DISP_CHANGE_BADFLAGS: 
       MessageBox.Show("An invalid set of flags was passed in."); 
       break; 
      case NativeMethods.DISP_CHANGE_BADPARAM: 
       MessageBox.Show("An invalid parameter was passed in. This can include an invalid flag or combination of flags."); 
       break; 
      case NativeMethods.DISP_CHANGE_NOTUPDATED: 
       MessageBox.Show("Unable to write settings to the registry."); 
       break; 
      default: 
       MessageBox.Show("Unknown return value from ChangeDisplaySettings API"); 
       break; 
     } 
    } 
} 

DEVMOD Struct

[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi)] 
public struct DEVMODE 
{ 
    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
    public string dmDeviceName; 

    public short dmSpecVersion; 
    public short dmDriverVersion; 
    public short dmSize; 
    public short dmDriverExtra; 
    public int dmFields; 
    public int dmPositionX; 
    public int dmPositionY; 
    public int dmDisplayOrientation; 
    public int dmDisplayFixedOutput; 
    public short dmColor; 
    public short dmDuplex; 
    public short dmYResolution; 
    public short dmTTOption; 
    public short dmCollate; 

    [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
    public string dmFormName; 

    public short dmLogPixels; 
    public short dmBitsPerPel; 
    public int dmPelsWidth; 
    public int dmPelsHeight; 
    public int dmDisplayFlags; 
    public int dmDisplayFrequency; 
    public int dmICMMethod; 
    public int dmICMIntent; 
    public int dmMediaType; 
    public int dmDitherType; 
    public int dmReserved1; 
    public int dmReserved2; 
    public int dmPanningWidth; 
    public int dmPanningHeight; 
}; 

public class NativeMethods 
{ 
    // PInvoke declaration for EnumDisplaySettings Win32 API 
    [DllImport("user32.dll", CharSet = CharSet.Ansi)] 
    public static extern int EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode); 

    // PInvoke declaration for ChangeDisplaySettings Win32 API 
    [DllImport("user32.dll", CharSet = CharSet.Ansi)] 
    public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags); 

    // helper for creating an initialized DEVMODE structure 
    public static DEVMODE CreateDevmode() 
    { 
     DEVMODE dm = new DEVMODE(); 
     dm.dmDeviceName = new String(new char[32]); 
     dm.dmFormName = new String(new char[32]); 
     dm.dmSize = (short)Marshal.SizeOf(dm); 
     return dm; 
    } 

    // constants 
    public const int ENUM_CURRENT_SETTINGS = -1; 
    public const int DISP_CHANGE_SUCCESSFUL = 0; 
    public const int DISP_CHANGE_BADDUALVIEW = -6; 
    public const int DISP_CHANGE_BADFLAGS = -4; 
    public const int DISP_CHANGE_BADMODE = -2; 
    public const int DISP_CHANGE_BADPARAM = -5; 
    public const int DISP_CHANGE_FAILED = -1; 
    public const int DISP_CHANGE_NOTUPDATED = -3; 
    public const int DISP_CHANGE_RESTART = 1; 
    public const int DMDO_DEFAULT = 0; 
    public const int DMDO_90 = 1; 
    public const int DMDO_180 = 2; 
    public const int DMDO_270 = 3; 
}