Hi,

That's probably not really an out of memory exception considering the relatively small size of the PDF file. Even if your server only has 300MB physical memory (which indeed is low of course), you still have 4GB logical memory space. When you are low on physical memory, Windows does disk/memory swap to satisfy memory allocation request, which basically runs things on disk instead of in memory. The net result is that everything becomes very slow but the benefit is so that your application won't get out of memory exception.

I would recommend you to check the full stack trace of the out of memory error. Particularly GDI+ is notorious for throw out of memory exception when the problem is something else. So if you can post the full stack trace of the error, we will look into it and see if we can figure out anything.

Thanks!

Hi,

Thanks for the additional information. We have located the corresponding source code of this error. The root of the problem is that we are calling Graphics.FromHdc using a screen HDC, which might cause GDI+ trying to allocate some screen buffer and fails due to limited resource on your system (we were not able to reproduce and verify this theory though). GDI+ is notorious for throwing out of memory error whenever it can not complete something successfully due to whatever reason.

A code review indicated that it is not necessary to call Graphics.FromHdc in this particular case. So we will make the change and provide a new build either today or tomorrow without this call --- that may not resolve the issue for you completely but if you run into another error, you can post the stack trace again and then we can then go from there. And if it still fails at the same place, we might be able to get a more specific error message/code that can bring us closer to the real problem.

We will post again when we have the new build.

Thanks!

Hi,

You are very welcome. We do not know their specific yet. In addition to resource constrains, it is not uncommon that a cloud environment restricts certain permissions that might cause the application to fail (since the HTML to PDF makes a lot of low level API calls). So at this point we do not know whether it will eventually work for you or not in such environment. However we will work with you closely to find out the root of the problem and hopefully that will give you a definite answer very soon.

Thanks!

Hi,
I make a try with the new build, unfortunately I got the same error:
I tried with very simple code in an MVC action , so the "out of memory" should not be the real problem like you mentioned.


public ActionResult TestPDF()
{

HtmlToPdf.Options.PageSize = EO.Pdf.PdfPageSizes.Letter;
HtmlToPdf.Options.OutputArea = new RectangleF(0f, 0f, 8.5f, 11.5f);

string htmlCode = @"<div style=""width:300px; margin:50px auto; font-size:20px"">Hello World</div>";
string pdfPath = this.Request.MapPath("~/pdfs/testSimpleHtml.pdf");
HtmlToPdf.ConvertHtml(htmlCode, pdfPath);

return new ContentResult();


}
Thanks very much for your time. Please let me know if you have some other solutions to test.
I will try to get some hints from the hosting team.

Stack trace:

[OutOfMemoryException: Out of memory.]
System.Drawing.Graphics.FromHdcInternal(IntPtr hdc) +1149345
System.Drawing.Font.ToLogFont(Object logFont) +145
System.Drawing.Font.ToHfont() +98
EO.Pdf.Internal.el.a(j3 A_0) +85
EO.Pdf.Internal.el.b(j3 A_0) +177
EO.Pdf.Drawing.PdfFont..ctor(j3 A_0, Single A_1) +31
EO.Pdf.Internal.fn.b(ka A_0) +542
EO.Pdf.Internal.fn.a(j7[] A_0) +161
EO.Pdf.Internal.fn..ctor(lu A_0, Boolean A_1, Int32 A_2, kv A_3, Int32 A_4, Single A_5, Rectangle A_6, PdfPage A_7, d0 A_8, Int32 A_9, Graphics A_10, Dictionary`2 A_11) +1087
EO.Pdf.Internal.lu.a(PdfPage A_0, Boolean A_1, Int32 A_2, Rectangle A_3, kv A_4, ha A_5, Int32& A_6, Graphics A_7) +1133
EO.Pdf.Internal.lu.a(Int32 A_0, HtmlToPdfResult A_1, Int32& A_2) +2770
EO.Pdf.Internal.lu.d() +263

[HtmlToPdfException: Convertion failed. Out of memory.]
EO.Pdf.HtmlToPdfException.b(Exception A_0) +65
EO.Pdf.Internal.lu.d() +1282
EO.Pdf.HtmlToPdfSession.RenderAsPDF(PdfDocument doc) +55
EO.Pdf.HtmlToPdf.ConvertHtml(String html, PdfDocument doc, HtmlToPdfOptions options) +105
EO.Pdf.HtmlToPdf.ConvertHtml(String html, String pdfFileName, HtmlToPdfOptions options) +50
KiskiWebApps.Areas.Admin.Controllers.PdfController.TestPDF() +152
lambda_method(Closure , ControllerBase , Object[] ) +62
System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +156
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +22
System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +29
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32
System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +50
System.Web.Mvc.Async.<>c__DisplayClass48.<InvokeActionMethodFilterAsynchronouslyRecursive>b__41() +225
System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34
System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26
System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100
System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49
System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27
System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +39
System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +28
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +29
System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10
System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21
System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +36
System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +54
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +31
System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9690164
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155

Hi,
Everleap confirms me that they use the exact same underlying technology as with Azure websites. :-(

Thanks very much for your time!
Bernard.