63 lines
2.1 KiB
C#
63 lines
2.1 KiB
C#
using System;
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using System.Threading.Tasks;
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using System.Windows.Media.Imaging;
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namespace Ink_Canvas.Helpers
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{
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/// <summary>
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/// 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。
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/// </summary>
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internal static class PdfDocumentRenderHelper
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{
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public static async Task<uint> GetPageCountAsync(string pdfPath)
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{
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uint winRt = 0;
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try
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{
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winRt = await PdfWinRtHelper.GetPageCountAsync(pdfPath).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"PDF WinRT 获取页数失败，将尝试 PDFtoImage(MIT): {ex.Message}", LogHelper.LogType.Warning);
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}
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if (winRt > 0)
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return winRt;
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try
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{
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return await Task.Run(() => PdfToImageMitHelper.GetPageCount(pdfPath)).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"PDFtoImage(MIT) 获取页数失败: {ex.Message}", LogHelper.LogType.Warning);
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return 0;
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}
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}
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public static async Task<BitmapSource> RenderPageToBitmapSourceAsync(string pdfPath, uint pageIndex)
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{
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try
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{
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BitmapSource win = await PdfWinRtHelper.RenderPageToBitmapSourceAsync(pdfPath, pageIndex).ConfigureAwait(false);
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if (win != null)
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return win;
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"PDF WinRT 渲染失败，将尝试 PDFtoImage(MIT): {ex.Message}", LogHelper.LogType.Warning);
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}
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try
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{
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return await PdfToImageMitHelper.RenderPageToBitmapSourceAsync(pdfPath, pageIndex).ConfigureAwait(false);
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}
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catch (Exception ex)
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{
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LogHelper.WriteLogToFile($"PDFtoImage(MIT) 渲染失败: {ex.Message}", LogHelper.LogType.Warning);
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return null;
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}
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}
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}
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}
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