How do I print an HTML document from a web service?

Question

I want to print HTML from a C# web service. The Web Browser control is overkill, and does not function well in a service-environment, nor does it function well on a system with very tight security constraints. Is there any sort of free .NET library that will support the printing of a basic HTML page? Here is the code I have so far, that is not running properly.

public void PrintThing(string document)
{
    if (Thread.CurrentThread.GetApartmentState() != ApartmentState.STA)
    {
        Thread thread =
            new Thread((ThreadStart) delegate { PrintDocument(document); });
        thread.SetApartmentState(ApartmentState.STA);
        thread.Start();
    }
    else
    {
        PrintDocument(document);
    }
}

protected void PrintDocument(string document)
{
    WebBrowser browser = new WebBrowser();
    browser.DocumentText = document;
    while (browser.ReadyState != WebBrowserReadyState.Complete)
    {
        Application.DoEvents();
    }
    browser.Print();
}

This works fine when called from UI-type threads, but nothing happens when called from a service-type thread. Changing Print() to ShowPrintPreviewDialog() yields the following IE script error:

Error: 'dialogArguments.___IE_PrintType' is null or not an object URL: res://ieframe.dll/preview.dlg

And a small empty print preview dialog appears.

Answer 1

What version of .net are you using? I think if you using 3.5 there is a document render that is NOT the WebBrowser Control. but it uses WPF stuff.

Answer 2

I know that Visual Studio itself (at least in 2003 version) references the IE dll directly to render the "Design View".

It may be worth looking into that.

Otherwise, I can't think of anything beyond the Web Browser control.

Answer 3

You can print from the command line using the following:

rundll32.exe %WINDIR%\System32\mshtml.dll,PrintHTML "%1"

Where %1 is the file path of the html file to be printed.

If you don't need to print from memory (or can afford to write to the disk in a temp file) you can use:

using (Process printProcess = new Process())
{
    string systemPath = Environment.GetFolderPath(Environment.SpecialFolder.System);
    printProcess.StartInfo.FileName = systemPath + @"\rundll32.exe";
    printProcess.StartInfo.Arguments = systemPath + @"\mshtml.dll,PrintHTML """ + fileToPrint + @"""";
    printProcess.Start();
}

N.B. This only works on Windows 2000 and above I think.

Answer 4

I don't know the specific tools, but there are some utilities that record / replay clicks. In other words, you could automate the "click" on the print dialog. (I know this is a hack, but when all else fails...)

Answer 5

Maybe this will help. http://www.codeproject.com/KB/printing/printhml.aspx Also not sure what thread you are trying to access the browser control from, but it needs to be STA

Note - The project referred to in the link does allow you to navigate to a page and perform a print without showing the print dialog.

Answer 6

Another way is export HTML to RTF format, which more convenient for printing. For example with help of SautinSoft's HTML-to-RTF library:

SautinSoft.HtmlToRtf h = new SautinSoft.HtmlToRtf();
//Set page size, orientation and page margins
h.PageStyle.PageSize.Letter();
h.PageStyle.PageOrientation.Landscape();
h.PageStyle.PageMarginLeft.mm(30f);
string rtf = h.ConvertString(html);

Next use RichTextBox to print produced RTF in C#.

Answer 7

If you've got it in the budget (~$3000), check out PrinceXML.

It will render HTML into a PDF, functions well in a service environment, and supports advanced features such as not breaking a page in the middle of a table cell (which a lot of browsers don't currently support).