improve:pdf插入

2026-04-05 18:42:06 +08:00
parent ea375a9ce6
commit bad05f77b5
6 changed files with 337 additions and 3 deletions
@@ -0,0 +1,62 @@
+using System;
+using System.Threading.Tasks;
+using System.Windows.Media.Imaging;
+
+namespace Ink_Canvas.Helpers
+{
+    /// <summary>
+    /// PDF 页数与位图渲染：优先 <see cref="PdfWinRtHelper"/>（Windows.Data.Pdf），失败或无效结果时使用 PDFtoImage(MIT) 备用。
+    /// </summary>
+    internal static class PdfDocumentRenderHelper
+    {
+        public static async Task<uint> GetPageCountAsync(string pdfPath)
+        {
+            uint winRt = 0;
+            try
+            {
+                winRt = await PdfWinRtHelper.GetPageCountAsync(pdfPath).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"PDF WinRT 获取页数失败，将尝试 PDFtoImage(MIT): {ex.Message}", LogHelper.LogType.Warning);
+            }
+
+            if (winRt > 0)
+                return winRt;
+
+            try
+            {
+                return await Task.Run(() => PdfToImageMitHelper.GetPageCount(pdfPath)).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"PDFtoImage(MIT) 获取页数失败: {ex.Message}", LogHelper.LogType.Warning);
+                return 0;
+            }
+        }
+
+        public static async Task<BitmapSource> RenderPageToBitmapSourceAsync(string pdfPath, uint pageIndex)
+        {
+            try
+            {
+                BitmapSource win = await PdfWinRtHelper.RenderPageToBitmapSourceAsync(pdfPath, pageIndex).ConfigureAwait(false);
+                if (win != null)
+                    return win;
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"PDF WinRT 渲染失败，将尝试 PDFtoImage(MIT): {ex.Message}", LogHelper.LogType.Warning);
+            }
+
+            try
+            {
+                return await PdfToImageMitHelper.RenderPageToBitmapSourceAsync(pdfPath, pageIndex).ConfigureAwait(false);
+            }
+            catch (Exception ex)
+            {
+                LogHelper.WriteLogToFile($"PDFtoImage(MIT) 渲染失败: {ex.Message}", LogHelper.LogType.Warning);
+                return null;
+            }
+        }
+    }
+}