Autohotkey 抓多螢幕解析度方法

在公司打報告，希望用 OCR 判讀螢幕數字並自動抄錄以減少作業時間。這功能需要每個螢幕的長寬大小（pixel）才能讓程式知道 OCR 該看螢幕截圖的哪個位置。

原本是用 Autohotkey 的 SysGet Monitor 解決。但 SysGet 傳回的資料是錯的，也沒體力除錯了。為了省工不想寫額外程式，希望能用簡單的腳本解決。後來發現 powershell 可以做這件事情 

Get-WmiObject -Class Win32_VideoController | Out-File screen.out

輸出結果導向到檔案儲存，然後回 Autohotkey 從檔案中用 regex 從 VideoModeDescription 讀出解析度數值，然後做些加減乘除就有各螢幕大小和座標了。 值得一提的是其他的失敗方案：

Add-Type -AssemblyName System.Windows.Forms
System.Windows.Forms.Screen]::AllScreens

 這個 powershell 方法能得到全螢幕解析度，但會受到 scaling factor 干擾，得到的 width、height 必須乘以該螢幕的對應 scaling factor 才能還原為真實的螢幕解析度，但找了一陣子沒發現快速得到 scaling factor 的方法，因此就放棄此法。

[System.Windows.Forms.SystemInformation]::PrimaryMonitorSize 

這個方法則是只能得到主螢幕解析度，看不到第二第三顆的。

 年紀真的大了，花了一個半小時研究城市又開始眩暈 QQ

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$pinvokeCode = @" 
using System; 
using System.Runtime.InteropServices; 
using System.Collections.Generic;
namespace Resolution 
{ 
    [StructLayout(LayoutKind.Sequential)] 
    public struct DEVMODE1 
    { 
        [MarshalAs(UnmanagedType.ByValTStr, SizeConst = 32)] 
        public string dmDeviceName; 
        public short dmSpecVersion; 
        public short dmDriverVersion; 
        public short dmSize; 
        public short dmDriverExtra; 
        public int dmFields; 
        public short dmOrientation; 
        public short dmPaperSize; 
        public short dmPaperLength; 
        public short dmPaperWidth; 
        public short dmScale; 
        public short dmCopies; 
        public short dmDefaultSource; 
        public short dmPrintQuality; 
        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; 
    }; 
	
	[Flags()]
	public enum DisplayDeviceStateFlags : int
	{
		/// <summary>The device is part of the desktop.</summary>
		AttachedToDesktop = 0x1,
		MultiDriver = 0x2,
		/// <summary>The device is part of the desktop.</summary>
		PrimaryDevice = 0x4,
		/// <summary>Represents a pseudo device used to mirror application drawing for remoting or other purposes.</summary>
		MirroringDriver = 0x8,
		/// <summary>The device is VGA compatible.</summary>
		VGACompatible = 0x10,
		/// <summary>The device is removable; it cannot be the primary display.</summary>
		Removable = 0x20,
		/// <summary>The device has more display modes than its output devices support.</summary>
		ModesPruned = 0x8000000,
		Remote = 0x4000000,
		Disconnect = 0x2000000
	}
	[StructLayout(LayoutKind.Sequential, CharSet=CharSet.Ansi)]
	public struct DISPLAY_DEVICE 
	{
		  [MarshalAs(UnmanagedType.U4)]
		  public int cb;
		  [MarshalAs(UnmanagedType.ByValTStr, SizeConst=32)]
		  public string DeviceName;
		  [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
		  public string DeviceString;
		  [MarshalAs(UnmanagedType.U4)]
		  public DisplayDeviceStateFlags StateFlags;
		  [MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
		  public string DeviceID;
		[MarshalAs(UnmanagedType.ByValTStr, SizeConst=128)]
		  public string DeviceKey;
	}
    class User_32 
    { 
        [DllImport("user32.dll")] 
        public static extern int EnumDisplaySettings(string deviceName, int modeNum, ref DEVMODE1 devMode); 
        [DllImport("user32.dll")] 
        public static extern int ChangeDisplaySettings(ref DEVMODE1 devMode, int flags); 
		[DllImport("user32.dll")]
		public static extern bool EnumDisplayDevices(string lpDevice, uint iDevNum, ref DISPLAY_DEVICE lpDisplayDevice, uint dwFlags);
        public const int ENUM_CURRENT_SETTINGS = -1; 
        public const int CDS_UPDATEREGISTRY = 0x01; 
        public const int CDS_TEST = 0x02; 
        public const int DISP_CHANGE_SUCCESSFUL = 0; 
        public const int DISP_CHANGE_RESTART = 1; 
        public const int DISP_CHANGE_FAILED = -1; 
    } 
    public class Displays
    {
		public static IList<string> GetDisplayNames()
		{
			var returnVals = new List<string>();
			for(var x=0U; x<1024; ++x)
			{
				DISPLAY_DEVICE outVar = new DISPLAY_DEVICE();
				outVar.cb = (short)Marshal.SizeOf(outVar);
				if(User_32.EnumDisplayDevices(null, x, ref outVar, 1U))
				{
					returnVals.Add(outVar.DeviceName);
				}
			}
			return returnVals;
		}
		
		public static string GetCurrentResolution(string deviceName)
        {
            string returnValue = null;
            DEVMODE1 dm = GetDevMode1();
            if (0 != User_32.EnumDisplaySettings(deviceName, User_32.ENUM_CURRENT_SETTINGS, ref dm))
            {
                returnValue = dm.dmPelsWidth + "," + dm.dmPelsHeight;
            }
            return returnValue;
        }
		
		public static IList<string> GetResolutions()
		{
			var displays = GetDisplayNames();
			var returnValue = new List<string>();
			foreach(var display in displays)
			{
				returnValue.Add(GetCurrentResolution(display));
			}
			return returnValue;
		}
		
        private static DEVMODE1 GetDevMode1() 
        { 
            DEVMODE1 dm = new DEVMODE1(); 
            dm.dmDeviceName = new String(new char[32]); 
            dm.dmFormName = new String(new char[32]); 
            dm.dmSize = (short)Marshal.SizeOf(dm); 
            return dm; 
        } 
    }
} 
"@
Add-Type $pinvokeCode
[Resolution.Displays]::GetResolutions();

方法出處 

結果本以為能用的方法失敗，最後換了這個方法，在 Autohotkey 中呼叫 powershell.exe 執行這段腳本，用 Out-File 導出成文字檔用 regex parse。 話說 powershell 可以直接執行 C# 代碼耶，作為「腳本語言」這會不會太強了點？XDDDDD

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