初始化

CPF.Mac/Mac/CoreGraphics/CGPDFString.cs

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+using CPF.Mac.CoreFoundation;
+using System;
+using System.Runtime.InteropServices;
+
+namespace CPF.Mac.CoreGraphics
+{
+	internal static class CGPDFString
+	{
+		[DllImport("/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Frameworks/CoreGraphics.framework/CoreGraphics")]
+		private static extern IntPtr CGPDFStringCopyTextString(IntPtr pdfStr);
+
+		public static string ToString(IntPtr pdfString)
+		{
+			if (pdfString == IntPtr.Zero)
+			{
+				return null;
+			}
+			using (CFString cFString = new CFString(CGPDFStringCopyTextString(pdfString), owns: true))
+			{
+				return cFString.ToString();
+			}
+		}
+	}
+}