c#下利用winAPI來實現擴充套件屏的解析度設定、方向切換等
1、背景：頭顯裝置連線電腦作為擴充套件屏使用，由於顯示屏廠家的原因，拿過來初始臉上電腦的話是橫向的，需要手動控制去設定成縱向，這樣做成產品的話，體驗比較差；
在網上找到了一種方法利用 ChangeDisplaySettingsEx配合DEVMODE結構體來實現上述功能；
[DllImport("user32.dll")]
public static extern bool EnumDisplayDevices(string lpDevice, int iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, int dwFlags);//獲取螢幕資訊
[DllImport("user32.dll")]
public static extern int ChangeDisplaySettingsEx(string lpszDeviceName, [In] ref DEVMODE lpDevMode, IntPtr hwnd, int dwFlags, IntPtr lParam); //設定橫豎屏
[DllImport("user32.dll", CharSet = CharSet.Unicode)]
private static extern long SetDisplayConfig(uint numPathArrayElements,IntPtr pathArray, uint numModeArrayElements, IntPtr modeArray, uint flags); //這個函式用於設定螢幕的複製模式、或者擴充套件模式；
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 Point dmPosition;
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;
};
DEVMODE結構體，和CSDN上查到的是一樣的；
demo：http://download.csdn.net/detail/bossaiaboy/9407945