public static void ConvertHtmlToPdf(PdfDocument document, String outputPdfFilePath, Action <PdfDocument, byte[]> OutputCallback)
{
StringBuilder paramsBuilder;
StringBuilder output = new StringBuilder();
StringBuilder error = new StringBuilder();
ParsePdfParameters(document, ref outputPdfFilePath, out paramsBuilder);
using (Process process = new Process())
{
// create a new process of the WKHTMLPDF's executable
process.StartInfo.FileName = WkHtmlWkHtmlPdfConverter.WKHTMLPDF_EXE_PATH;
process.StartInfo.Arguments = paramsBuilder.ToString();
// don't use the shell mode
process.StartInfo.UseShellExecute = false;
// tell the process to redirect the I/O to the application
process.StartInfo.RedirectStandardOutput = true;
process.StartInfo.RedirectStandardError = true;
process.StartInfo.RedirectStandardInput = true;
using (AutoResetEvent outputWaitHandle = new AutoResetEvent(false))
using (AutoResetEvent errorWaitHandle = new AutoResetEvent(false))
{
DataReceivedEventHandler outputHandler = (sender, e) =>
{
if (e.Data == null)
{
outputWaitHandle.Set();
}
};
DataReceivedEventHandler errorHandler = (sender, e) =>
{
if (e.Data == null)
{
errorWaitHandle.Set();
}
else
{
error.AppendLine(e.Data);
}
};
process.OutputDataReceived += outputHandler;
process.ErrorDataReceived += errorHandler;
try
{
// start the process in another thread
process.Start();
process.BeginOutputReadLine();
process.BeginErrorReadLine();
// write the HTML document to the standard input
using (var stream = process.StandardInput)
{
byte[] buffer = Encoding.UTF8.GetBytes(document.Html);
stream.BaseStream.Write(buffer, 0, buffer.Length);
stream.WriteLine();
}
// wait for the thread, for a minute (by default)
if (process.WaitForExit(WkHtmlWkHtmlPdfConverter.TIMEOUT_MS) &&
outputWaitHandle.WaitOne(WkHtmlWkHtmlPdfConverter.TIMEOUT_MS) &&
errorWaitHandle.WaitOne(WkHtmlWkHtmlPdfConverter.TIMEOUT_MS))
{
if (process.ExitCode != 0 && !File.Exists(outputPdfFilePath))
{
throw new WkHtmlPdfConverterException(
String.Format("Html to PDF conversion failed. Wkhtmltopdf output:\n{0}", error)
);
}
}
else
{
// kill the process if it is still running in background
if (!process.HasExited)
{
process.Kill();
}
throw new WkHtmlPdfConverterTimeoutException();
}
}
finally
{
// unset the I/O handlers
process.OutputDataReceived -= outputHandler;
process.ErrorDataReceived -= errorHandler;
}
}
}
// if the user gave a output callback, write the standard output to the callback Stream
if (OutputCallback != null)
{
byte[] pdfFileBytes = File.ReadAllBytes(outputPdfFilePath);
OutputCallback(document, pdfFileBytes);
}
}
public static void ConvertHtmlToPdf(PdfDocument document, String outputPdfFilePath)
{
WkHtmlWkHtmlPdfConverter.ConvertHtmlToPdf(document, outputPdfFilePath, null);
}
