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Bug Report T1282135
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PdfViewer - A document is slowly loaded and causes the "Unable to load the PDF document" error when Windows Narrator is enabled

created 3 days ago (modified 2 days ago)

Steps to reproduce:

  1. Enable Windows Narrator (or another tool that uses an application's accessibility).
  2. Load the document into PdfViewer.

The issue occurs in a specific document which cannot be shared in a public report.

Expected results:

A document is loaded fast and errors don't occur when Windows Narrator is enabled

Current results:

A document is loaded slowly and causes the "Unable to load the PDF document" error when Windows Narrator is enabled

Additional information:

Call Stack
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.ParseGenericBlockElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 108    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.DevExpress.Pdf.Native.IPdfLogicalStructureVisitor.VisitElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 105    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfLogicalStructureItemExtension.Accept(DevExpress.Pdf.PdfLogicalStructureItem item, DevExpress.Pdf.Native.IPdfLogicalStructureVisitor visitor) Line 49    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.ParseGenericBlockElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 109    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.DevExpress.Pdf.Native.IPdfLogicalStructureVisitor.VisitElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 105    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfLogicalStructureItemExtension.Accept(DevExpress.Pdf.PdfLogicalStructureItem item, DevExpress.Pdf.Native.IPdfLogicalStructureVisitor visitor) Line 49    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.ParseGenericBlockElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 109    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.DevExpress.Pdf.Native.IPdfLogicalStructureVisitor.VisitElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 105    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfLogicalStructureItemExtension.Accept(DevExpress.Pdf.PdfLogicalStructureItem item, DevExpress.Pdf.Native.IPdfLogicalStructureVisitor visitor) Line 49    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.ParseGenericBlockElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 109    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.DevExpress.Pdf.Native.IPdfLogicalStructureVisitor.VisitElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 105    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfLogicalStructureItemExtension.Accept(DevExpress.Pdf.PdfLogicalStructureItem item, DevExpress.Pdf.Native.IPdfLogicalStructureVisitor visitor) Line 49    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.ParseGenericBlockElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 109    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.DevExpress.Pdf.Native.IPdfLogicalStructureVisitor.VisitElement(DevExpress.Pdf.PdfLogicalStructureElement element) Line 105    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfLogicalStructureItemExtension.Accept(DevExpress.Pdf.PdfLogicalStructureItem item, DevExpress.Pdf.Native.IPdfLogicalStructureVisitor visitor) Line 49    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.PerformParse() Line 93    C#
DevExpress.Pdf.v24.2.Core.dll!DevExpress.Pdf.Native.PdfTaggedDataRecognizer.Parse(DevExpress.Pdf.Native.PdfMarkedContentDataCache cache) Line 77    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextModelTagged.ParseTextModel() Line 93    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextModelBase.RecreateInnerData() Line 104    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextModelBase.TextModelBase(DevExpress.XtraPdfViewer.PdfViewer pdfViewer, bool calcData) Line 85    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextModelTagged.TextModelTagged(DevExpress.XtraPdfViewer.PdfViewer pdfViewer, bool calcData) Line 85    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextModelBase.Create(DevExpress.XtraPdfViewer.PdfViewer viewer) Line 60    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.TextProvider.TextProvider(DevExpress.XtraPdfViewer.PdfViewer viewer) Line 49    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.PdfViewerControlAccessible.GetTextProvider() Line 128    C#
DevExpress.XtraPdfViewer.v24.2.dll!DevExpress.XtraPdfViewer.Native.PdfViewerControlAccessible.GetPatternProvider(DevExpress.UIAutomation.AutomationPattern pattern) Line 123    C#
DevExpress.Utils.v24.2.dll!DevExpress.Accessibility.BaseAccessible.DevExpress.UIAutomation.IAutomationElementProviderWrapper.GetPatternProvider(DevExpress.UIAutomation.AutomationPattern pattern) Line 663    C#
DevExpress.Utils.v24.2.dll!DevExpress.UIAutomation.AutomationElementProvider.GetPatternProvider(DevExpress.UIAutomation.AutomationPattern pattern) Line 209    C#
DevExpress.Utils.v24.2.dll!DevExpress.UIAutomation.AutomationElementProvider.DevExpress.UIAutomation.IRawElementProviderSimple.GetPatternProvider(int patternId) Line 206    C#

Workaround

As a temporary solution, use the WindowsFormsSettings.DisableAccessibility property to disable accessibility as follows:

C#
WindowsFormsSettings.DisableAccessibility = DevExpress.Utils.DefaultBoolean.True;
Visual Basic
WindowsFormsSettings.DisableAccessibility = DevExpress.Utils.DefaultBoolean.True
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