如何设置显示器的方向在Windows 7？

问题描述

我想写一些有趣code翻转的方向上我想控制的选项的Windows 7见截图倒挂。

I want to write some fun code to flip the orientation upside down on Windows 7. See screen shot of the option I want to control.

下面是code我有：

class Program
{
    public const long WM_PAINT=0x0F;
    public const long WM_DISPLAYCHANGE=0x7E;

    [StructLayout(LayoutKind.Sequential, CharSet=CharSet.Auto)]
    public struct DEVMODE // taken from Win API
    {
        ...
        public System.Windows.Forms.ScreenOrientation dmDisplayOrientation;
    }

    [DllImport("user32.dll", CharSet=CharSet.Auto)]
    public static extern bool EnumDisplaySettings(string lpszDeviceName, int iModeNum, ref DEVMODE lpDevMode);
    [DllImport("user32.dll", CharSet=CharSet.Ansi)]
    public static extern int ChangeDisplaySettings(ref DEVMODE lpDevMode, int dwFlags);
    [DllImport("User32.Dll")]
    public static extern long PostMessage(IntPtr hWnd, long wMsg, long wParam, long lParam);


    static void Main(string[] args)
    {

        ScreenOrientation ori=ScreenOrientation.Angle0;
        DEVMODE mode=new DEVMODE()
        {
            dmSize=(short)Marshal.SizeOf(typeof(DEVMODE)),
            dmDriverExtra=0,
            dmDeviceName=new string(new char[32]),
            dmFormName=new string(new char[32]),
        };

        try
        {
            EnumDisplaySettings(null, -1, ref mode);
            if((mode.dmFields&0x80)>0)
            {
                ori=mode.dmDisplayOrientation;
            }

            mode.dmDisplayOrientation=ScreenOrientation.Angle270;
            int temp=mode.dmPelsWidth;
            mode.dmPelsWidth=mode.dmPelsHeight;
            mode.dmPelsHeight=temp;
            int ret=ChangeDisplaySettings(ref mode, 0);
            PostMessage(Process.GetCurrentProcess().Handle, WM_DISPLAYCHANGE, 0, 0);
            ...
        }
        catch
        {
        }
    }
}

它运行，但不产生任何影响。

which runs, but does not produce any affects.

参考code：
和的

推荐答案

我已经开始的东西。

请看看：

它包括Win7的必要的结构，这样就可以调用SetDisplayConfig等功能。

It includes necessary structures for Win7, so that you could call SetDisplayConfig and other functions.

这是实际的例子，如何旋转显示器90度：

An actual example, how to rotate monitor 90 degrees:

        int numPathArrayElements;
        int numModeInfoArrayElements;

        const QueryDisplayFlags pathType = QueryDisplayFlags.OnlyActivePaths;

        // query active paths from the current computer.
        // note that 0 is equal to SUCCESS!
        // TODO; HARDCODE MAGIC VALUES AWAY.
        if (CCDWrapper.GetDisplayConfigBufferSizes(pathType, out numPathArrayElements,
                                                   out numModeInfoArrayElements) == 0)
        {
            var pathInfoArray = new DisplayConfigPathInfo[numPathArrayElements];
            var modeInfoArray = new DisplayConfigModeInfo[numModeInfoArrayElements];

            // TODO; FALLBACK MECHANISM THAT HANDLES DIFFERENT VALUES FOR ZERO.
            if (CCDWrapper.QueryDisplayConfig(
                pathType,
                ref numPathArrayElements, pathInfoArray,
                ref numModeInfoArrayElements,
                modeInfoArray, IntPtr.Zero) == 0)
            {

                pathInfoArray[0].targetInfo.rotation = DisplayConfigRotation.Rotate90;
                CCDWrapper.SetDisplayConfig((uint) numPathArrayElements, pathInfoArray, (uint) numModeInfoArrayElements,
                                            modeInfoArray, SdcFlags.Apply | SdcFlags.UseSuppliedDisplayConfig);
            }
         }

这是原始的，现在，这意味着没有C＃风格的API的权利，但没有少，你可以使用这些结构。

it's raw right now, meaning there is no "C# style" API right now, but none the less, you can use those structures.

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