chrisfcarroll/HtmlToPdfWriter.cs

## HtmlToPdfWriter.cs
//Uncomment and paste into LinqPad: void Main()
//{
//	var pathToWkHtmlToPdfExe=@"C:\yourpathto\wkhtmltopdf.exe";
//	var outputPath=new FileInfo(Path.Combine(System.IO.Path.GetTempPath(), "htmlto.pdf"));
//	var html="<html><head></head><body><style>body{font-family:\"Helvetica\"}</style><h1>Hello World</h1></body></html>";
//	using(var outputstream= new MemoryStream(10000))
//	{
//	  HtmlToPdfWriter.GeneratePdf(new StringReader(html), outputstream, new Size{Width=210,Height=297}, pathToWkHtmlToPdfExe );
//	  Encoding.UTF8.GetString(outputstream.GetBuffer()).Dump();
//	  using (var fs=outputPath.OpenWrite()){ outputstream.CopyTo(fs); }
//	}
//	outputPath.FullName.Dump();
//}
public static class HtmlToPdfWriter
{
    public static string defaultExePath = @".\wkhtmltopdf.exe";

    public static bool GeneratePdf(TextReader html, Stream pdf, Size pageSizeInMM, string pathToExe = null)
    {
        pathToExe = pathToExe??defaultExePath;

        ProcessStartInfo psi = new ProcessStartInfo
        {
            FileName = pathToExe,
            WorkingDirectory = Path.GetDirectoryName(pathToExe),
            UseShellExecute = false,
            CreateNoWindow = true,
            RedirectStandardInput = true,
            RedirectStandardOutput = true,
            RedirectStandardError = true,
            Arguments =
                "-q --disable-smart-shrinking --no-print-media-type " +
                (pageSizeInMM.Equals( default(Size) )
                    ? ""
                    : "--page-width " + pageSizeInMM.Width + "mm --page-height " + pageSizeInMM.Height + "mm") +
                " - -"
            /* note we tell wkhtmltopdf to be quiet and not run scripts */
        };
        try
        {
            using (Process p = Process.Start(psi))
            {
                try
                {
                    StreamWriter stdin = p.StandardInput;
                    stdin.AutoFlush = true;
                    stdin.Write(html.ReadToEnd());
                    stdin.Dispose();

                    CopyStream(p.StandardOutput.BaseStream, pdf);
                    p.StandardOutput.Close();
                    pdf.Position = 0;

                    var result = p.WaitForExit(10000);
                    var exitCode = p.ExitCode;
                    return result;
                }
                catch
                {
                    return false;
                }
            }
        }
        catch (System.ComponentModel.Win32Exception e)
        {
            throw new ApplicationException("Failed to run the pdf generator because " + e.Message ,e);
        }
    }

    static void CopyStream(Stream input, Stream output)
    {
        byte[] buffer = new byte[32768];
        int read;
        while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
        {
            output.Write(buffer, 0, read);
        }
    }
}
public struct Size { public int Height ; public int Width; }
	//Uncomment and paste into LinqPad: void Main()
	//{
	// var pathToWkHtmlToPdfExe=@"C:\yourpathto\wkhtmltopdf.exe";
	// var outputPath=new FileInfo(Path.Combine(System.IO.Path.GetTempPath(), "htmlto.pdf"));
	// var html="<html><head></head><body><style>body{font-family:\"Helvetica\"}</style><h1>Hello World</h1></body></html>";
	// using(var outputstream= new MemoryStream(10000))
	// {
	// HtmlToPdfWriter.GeneratePdf(new StringReader(html), outputstream, new Size{Width=210,Height=297}, pathToWkHtmlToPdfExe );
	// Encoding.UTF8.GetString(outputstream.GetBuffer()).Dump();
	// using (var fs=outputPath.OpenWrite()){ outputstream.CopyTo(fs); }
	// }
	// outputPath.FullName.Dump();
	//}
	public static class HtmlToPdfWriter
	{
	public static string defaultExePath = @".\wkhtmltopdf.exe";

	public static bool GeneratePdf(TextReader html, Stream pdf, Size pageSizeInMM, string pathToExe = null)
	{
	pathToExe = pathToExe??defaultExePath;

	ProcessStartInfo psi = new ProcessStartInfo
	{
	FileName = pathToExe,
	WorkingDirectory = Path.GetDirectoryName(pathToExe),
	UseShellExecute = false,
	CreateNoWindow = true,
	RedirectStandardInput = true,
	RedirectStandardOutput = true,
	RedirectStandardError = true,
	Arguments =
	"-q --disable-smart-shrinking --no-print-media-type " +
	(pageSizeInMM.Equals( default(Size) )
	? ""
	: "--page-width " + pageSizeInMM.Width + "mm --page-height " + pageSizeInMM.Height + "mm") +
	" - -"
	/* note we tell wkhtmltopdf to be quiet and not run scripts */
	};
	try
	{
	using (Process p = Process.Start(psi))
	{
	try
	{
	StreamWriter stdin = p.StandardInput;
	stdin.AutoFlush = true;
	stdin.Write(html.ReadToEnd());
	stdin.Dispose();

	CopyStream(p.StandardOutput.BaseStream, pdf);
	p.StandardOutput.Close();
	pdf.Position = 0;

	var result = p.WaitForExit(10000);
	var exitCode = p.ExitCode;
	return result;
	}
	catch
	{
	return false;
	}
	}
	}
	catch (System.ComponentModel.Win32Exception e)
	{
	throw new ApplicationException("Failed to run the pdf generator because " + e.Message ,e);
	}
	}

	static void CopyStream(Stream input, Stream output)
	{
	byte[] buffer = new byte[32768];
	int read;
	while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
	{
	output.Write(buffer, 0, read);
	}
	}
	}
	public struct Size { public int Height ; public int Width; }