Question

我正在使用PDFSharp在我的网络应用中动态生成PDF。 Web应用程序在本地运行正常但是，当我将应用程序推送到Azure（作为Web应用程序）时，我得到以下异常：

{"message":"An error has occurred.","exceptionMessage":"Internal error. Font data could not retrieved.","exceptionType":"System.InvalidOperationException","stackTrace":" at PdfSharp.Fonts.OpenType.FontData.CreateGdiFontImage(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.FontData..ctor(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.OpenTypeDescriptor..ctor(XFont font, XPdfFontOptions options)\r\n at PdfSharp.Fonts.OpenType.OpenTypeDescriptor..ctor(XFont font)\r\n at PdfSharp.Fonts.FontDescriptorStock.CreateDescriptor(XFont font)\r\n at PdfSharp.Drawing.XFont.get_Metrics()\r\n at PdfSharp.Drawing.XFont.Initialize()\r\n at PdfSharp.Drawing.XFont..ctor(String familyName, Double emSize)\r\n at Spiro.Services.OrderService.GetOrderLabel(Int32 id, Nullable`1 quantity)\r\n at Spiro.Web.Controllers.WebApi.V1.OrderController.GetOrderLabel(Int32 id, Nullable`1 quantity)\r\n at lambda_method(Closure , Object , Object[] )\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.<>c__DisplayClass10.b__9(Object instance, Object[] methodParameters)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ActionExecutor.Execute(Object instance, Object[] arguments)\r\n at System.Web.Http.Controllers.ReflectedHttpActionDescriptor.ExecuteAsync(HttpControllerContext controllerContext, IDictionary`2 arguments, CancellationToken cancellationToken)\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ApiControllerActionInvoker.d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.ActionFilterResult.d__2.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Controllers.AuthenticationFilterResult.d__0.MoveNext()\r\n--- End of stack trace from previous location where exception was thrown ---\r\n at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)\r\n at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)\r\n at System.Web.Http.Dispatcher.HttpControllerDispatcher.d__1.MoveNext()"}

我按如下方式创建文本：

var document = new PdfDocument();
var page = document.AddPage();
var gfx = XGraphics.FromPdfPage(page);
var font = new XFont("Calibri", 30);


gfx.DrawString(rows[i], font, XBrushes.Black,
    new XPoint(XUnit.FromMillimeter(10),
               XUnit.FromMillimeter(10)),
               XStringFormats.TopLeft);

我可以看到Azure服务器安装了一堆字体 - 我对问题是什么感到困惑...提前感谢您的帮助。

Answer 1

Azure应用服务（又名Azure网站）实施了许多比云服务或IaaS（VM）更严格的安全约束。被阻止的一件事是访问大部分GDI API表面区域，其中包括一些字体操作。正如其他人所指出的那样，如果相同的代码适用于普通的IaaS VM，云服务，甚至是本地桌面/笔记本电脑，那么您遇到的问题就是基础GDI调用的硬块。

Answer 2

如果您可以访问该字体文件，并且可以将其与项目一起部署，则可以按照PDFSharp文档here中的详细说明加载该字体文件。无论您部署的环境如何，这都是确保字体可用的首选方法。

您还可以找到有关this SO post的更多信息。

使用PDFSharp时访问Azure Web App中的字体时出错

2 个答案: