问题
I can get primary screen orientation using this logic:
MessageBox.Show(SystemInformation.ScreenOrientation())
How can I handle this if I have multiple screens?I only manage to get primary screen orientation information. How can I get additional / other screens orientation ?
回答1:
According to Documentation, you can get all screens using System.Windows.Forms.Screen.AllScreens.
Just iterate over them like so and check the resolution, like so:
foreach (var screen in System.Windows.Forms.Screen.AllScreens)
{
if( screen.Bounds.Height > screen.Bounds.Width )
{
//Run the application in portrait, as in:
MessageBox.Show("Run in portrait.");
}
else
{
//Run the application in landscape, as in:
MessageBox.Show("Run in landscape.");
}
}
Edit:
I've search a bit on the wide web as I was curious myself and there does not seem to be an easy way to get it. I stumbled across this answer and modified it slightly..
Note that it is quite complex for what it does.. but it will allow you to query for a lot of other items.
public const int ERROR_SUCCESS = 0;
public enum QUERY_DEVICE_CONFIG_FLAGS: uint
{
QDC_ALL_PATHS = 0x00000001,
QDC_ONLY_ACTIVE_PATHS = 0x00000002,
QDC_DATABASE_CURRENT = 0x00000004
}
public enum DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY: uint
{
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_OTHER = 0xFFFFFFFF,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_HD15 = 0,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SVIDEO = 1,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_COMPOSITE_VIDEO = 2,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_COMPONENT_VIDEO = 3,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DVI = 4,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_HDMI = 5,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_LVDS = 6,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_D_JPN = 8,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SDI = 9,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EXTERNAL = 10,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_DISPLAYPORT_EMBEDDED = 11,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_UDI_EXTERNAL = 12,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_UDI_EMBEDDED = 13,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_SDTVDONGLE = 14,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_MIRACAST = 15,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_INTERNAL = 0x80000000,
DISPLAYCONFIG_OUTPUT_TECHNOLOGY_FORCE_UINT32 = 0xFFFFFFFF
}
public enum DISPLAYCONFIG_SCANLINE_ORDERING: uint
{
DISPLAYCONFIG_SCANLINE_ORDERING_UNSPECIFIED = 0,
DISPLAYCONFIG_SCANLINE_ORDERING_PROGRESSIVE = 1,
DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED = 2,
DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED_UPPERFIELDFIRST = DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED,
DISPLAYCONFIG_SCANLINE_ORDERING_INTERLACED_LOWERFIELDFIRST = 3,
DISPLAYCONFIG_SCANLINE_ORDERING_FORCE_UINT32 = 0xFFFFFFFF
}
public enum DISPLAYCONFIG_ROTATION: uint
{
DISPLAYCONFIG_ROTATION_IDENTITY = 1,
DISPLAYCONFIG_ROTATION_ROTATE90 = 2,
DISPLAYCONFIG_ROTATION_ROTATE180 = 3,
DISPLAYCONFIG_ROTATION_ROTATE270 = 4,
DISPLAYCONFIG_ROTATION_FORCE_UINT32 = 0xFFFFFFFF
}
public enum DISPLAYCONFIG_SCALING: uint
{
DISPLAYCONFIG_SCALING_IDENTITY = 1,
DISPLAYCONFIG_SCALING_CENTERED = 2,
DISPLAYCONFIG_SCALING_STRETCHED = 3,
DISPLAYCONFIG_SCALING_ASPECTRATIOCENTEREDMAX = 4,
DISPLAYCONFIG_SCALING_CUSTOM = 5,
DISPLAYCONFIG_SCALING_PREFERRED = 128,
DISPLAYCONFIG_SCALING_FORCE_UINT32 = 0xFFFFFFFF
}
public enum DISPLAYCONFIG_PIXELFORMAT : uint
{
DISPLAYCONFIG_PIXELFORMAT_8BPP = 1,
DISPLAYCONFIG_PIXELFORMAT_16BPP = 2,
DISPLAYCONFIG_PIXELFORMAT_24BPP = 3,
DISPLAYCONFIG_PIXELFORMAT_32BPP = 4,
DISPLAYCONFIG_PIXELFORMAT_NONGDI = 5,
DISPLAYCONFIG_PIXELFORMAT_FORCE_UINT32 = 0xffffffff
}
public enum DISPLAYCONFIG_MODE_INFO_TYPE : uint
{
DISPLAYCONFIG_MODE_INFO_TYPE_SOURCE = 1,
DISPLAYCONFIG_MODE_INFO_TYPE_TARGET = 2,
DISPLAYCONFIG_MODE_INFO_TYPE_FORCE_UINT32 = 0xFFFFFFFF
}
public enum DISPLAYCONFIG_DEVICE_INFO_TYPE : uint
{
DISPLAYCONFIG_DEVICE_INFO_GET_SOURCE_NAME = 1,
DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME = 2,
DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_PREFERRED_MODE = 3,
DISPLAYCONFIG_DEVICE_INFO_GET_ADAPTER_NAME = 4,
DISPLAYCONFIG_DEVICE_INFO_SET_TARGET_PERSISTENCE = 5,
DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_BASE_TYPE = 6,
DISPLAYCONFIG_DEVICE_INFO_FORCE_UINT32 = 0xFFFFFFFF
}
[StructLayout(LayoutKind.Sequential)]
public struct LUID
{
public uint LowPart;
public int HighPart;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_PATH_SOURCE_INFO
{
public LUID adapterId;
public uint id;
public uint modeInfoIdx;
public uint statusFlags;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_PATH_TARGET_INFO
{
public LUID adapterId;
public uint id;
public uint modeInfoIdx;
DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY outputTechnology;
public DISPLAYCONFIG_ROTATION rotation;
DISPLAYCONFIG_SCALING scaling;
DISPLAYCONFIG_RATIONAL refreshRate;
DISPLAYCONFIG_SCANLINE_ORDERING scanLineOrdering;
public bool targetAvailable;
public uint statusFlags;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_RATIONAL
{
public uint Numerator;
public uint Denominator;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_PATH_INFO
{
public DISPLAYCONFIG_PATH_SOURCE_INFO sourceInfo;
public DISPLAYCONFIG_PATH_TARGET_INFO targetInfo;
public uint flags;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_2DREGION
{
public uint cx;
public uint cy;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_VIDEO_SIGNAL_INFO
{
public ulong pixelRate;
public DISPLAYCONFIG_RATIONAL hSyncFreq;
public DISPLAYCONFIG_RATIONAL vSyncFreq;
public DISPLAYCONFIG_2DREGION activeSize;
public DISPLAYCONFIG_2DREGION totalSize;
public uint videoStandard;
public DISPLAYCONFIG_SCANLINE_ORDERING scanLineOrdering;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_TARGET_MODE
{
public DISPLAYCONFIG_VIDEO_SIGNAL_INFO targetVideoSignalInfo;
}
[StructLayout(LayoutKind.Sequential)]
public struct POINTL
{
int x;
int y;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_SOURCE_MODE
{
public uint width;
public uint height;
public DISPLAYCONFIG_PIXELFORMAT pixelFormat;
public POINTL position;
}
[StructLayout(LayoutKind.Explicit)]
public struct DISPLAYCONFIG_MODE_INFO_UNION
{
[FieldOffset(0)]
public DISPLAYCONFIG_TARGET_MODE targetMode;
[FieldOffset(0)]
public DISPLAYCONFIG_SOURCE_MODE sourceMode;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_MODE_INFO
{
public DISPLAYCONFIG_MODE_INFO_TYPE infoType;
public uint id;
public LUID adapterId;
public DISPLAYCONFIG_MODE_INFO_UNION modeInfo;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_TARGET_DEVICE_NAME_FLAGS
{
public uint value;
}
[StructLayout(LayoutKind.Sequential)]
public struct DISPLAYCONFIG_DEVICE_INFO_HEADER
{
public DISPLAYCONFIG_DEVICE_INFO_TYPE type;
public uint size;
public LUID adapterId;
public uint id;
}
[StructLayout(LayoutKind.Sequential, CharSet = CharSet.Unicode)]
public struct DISPLAYCONFIG_TARGET_DEVICE_NAME
{
public DISPLAYCONFIG_DEVICE_INFO_HEADER header;
public DISPLAYCONFIG_TARGET_DEVICE_NAME_FLAGS flags;
public DISPLAYCONFIG_VIDEO_OUTPUT_TECHNOLOGY outputTechnology;
public ushort edidManufactureId;
public ushort edidProductCodeId;
public uint connectorInstance;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 64)]
public string monitorFriendlyDeviceName;
[MarshalAs(UnmanagedType.ByValTStr, SizeConst = 128)]
public string monitorDevicePath;
}
[DllImport("user32.dll")]
public static extern int GetDisplayConfigBufferSizes(
QUERY_DEVICE_CONFIG_FLAGS Flags,
out uint NumPathArrayElements,
out uint NumModeInfoArrayElements
);
[DllImport("user32.dll")]
public static extern int QueryDisplayConfig(
QUERY_DEVICE_CONFIG_FLAGS Flags,
ref uint NumPathArrayElements,
[Out] DISPLAYCONFIG_PATH_INFO[] PathInfoArray,
ref uint NumModeInfoArrayElements,
[Out] DISPLAYCONFIG_MODE_INFO[] ModeInfoArray,
IntPtr CurrentTopologyId
);
[DllImport("user32.dll")]
public static extern int DisplayConfigGetDeviceInfo(
ref DISPLAYCONFIG_TARGET_DEVICE_NAME deviceName
);
[DllImport("user32.dll")]
public static extern object GetMonitorRotation(
ref DISPLAYCONFIG_PATH_INFO deviceStuff
);
public static string MonitorFriendlyName(LUID adapterId, uint targetId)
{
DISPLAYCONFIG_TARGET_DEVICE_NAME deviceName = new DISPLAYCONFIG_TARGET_DEVICE_NAME();
deviceName.header.size = (uint)Marshal.SizeOf(typeof(DISPLAYCONFIG_TARGET_DEVICE_NAME));
deviceName.header.adapterId = adapterId;
deviceName.header.id = targetId;
deviceName.header.type = DISPLAYCONFIG_DEVICE_INFO_TYPE.DISPLAYCONFIG_DEVICE_INFO_GET_TARGET_NAME;
int error = DisplayConfigGetDeviceInfo(ref deviceName);
if (error != ERROR_SUCCESS)
throw new Win32Exception(error);
return deviceName.monitorFriendlyDeviceName;
}
public static void Run()
{
uint PathCount, ModeCount;
int error = GetDisplayConfigBufferSizes(QUERY_DEVICE_CONFIG_FLAGS.QDC_ONLY_ACTIVE_PATHS,
out PathCount, out ModeCount);
if (error != ERROR_SUCCESS)
throw new Win32Exception(error);
DISPLAYCONFIG_PATH_INFO[] DisplayPaths = new DISPLAYCONFIG_PATH_INFO[PathCount];
DISPLAYCONFIG_MODE_INFO[] DisplayModes = new DISPLAYCONFIG_MODE_INFO[ModeCount];
error = QueryDisplayConfig(QUERY_DEVICE_CONFIG_FLAGS.QDC_ONLY_ACTIVE_PATHS,
ref PathCount, DisplayPaths, ref ModeCount, DisplayModes, IntPtr.Zero);
if (error != ERROR_SUCCESS)
throw new Win32Exception(error);
for (int i = 0; i < PathCount; i++)
{
Console.WriteLine(string.Format("{0} - {1}", MonitorFriendlyName(DisplayPaths[i].targetInfo.adapterId, DisplayPaths[i].targetInfo.id), (int)DisplayPaths[i].targetInfo.rotation));
}
Console.ReadLine();
}
After I ran the code that I've slightly modified (I have two monitors connected all without rotation) it resulted in:
DELL U2412M - 1
DELL U2412M - 1
Which is as expected.
I've left the code outside the for loop untouched because I believe there are a lot of interesting objects you can take a look at.
来源：https://stackoverflow.com/questions/52218727/detecting-secondary-screen-orientation-visual-basic