private static string GetOuputFile(ref QPDFOutput output, out bool delete, string tempFolderPath)
{
if (!String.IsNullOrWhiteSpace(output.OutputFilePath))
{
delete = false;
return(output.OutputFilePath);
}
else
{
delete = true;
output.OutputFilePath = Path.Combine(tempFolderPath, string.Format("{0}.pdf", Guid.NewGuid()));
return(output.OutputFilePath);
}
}
public static void ModifyPDF(QPDFDocument document, QPDFEnvironment environment, QPDFOutput qoutput)
{
if (environment == null)
{
environment = Environment;
}
// check if QPDF is installed!
if (!File.Exists(environment.QPDFPath))
{
throw new QPDFException(String.Format("File '{0}' not found. Check if QPDF application is installed.", environment.QPDFPath));
}
bool deleteInput = false;
string inputFilePath = GetSourceFile(ref document, out deleteInput, environment.TempFolderPath);
if (!File.Exists(inputFilePath))
{
// check if the PDF supplied is valid
throw new QPDFException(String.Format("File '{0}' not found.", inputFilePath));
}
// setup our output
bool deleteOutput = false;
string outputFilePath = GetOuputFile(ref qoutput, out deleteOutput, environment.TempFolderPath);
// setup our arguments
string arguments = GetDocumentArguments(ref document, outputFilePath);
try {
var output = new StringBuilder();
var error = new StringBuilder();
using (Process process = new Process()) {
process.StartInfo.FileName = environment.QPDFPath;
process.StartInfo.Arguments = arguments;
process.StartInfo.UseShellExecute = false;
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();
}
else
{
output.AppendLine(e.Data);
}
};
DataReceivedEventHandler errorHandler = (sender, e) => {
if (e.Data == null)
{
errorWaitHandle.Set();
}
else
{
error.AppendLine(e.Data);
}
};
process.OutputDataReceived += outputHandler;
process.ErrorDataReceived += errorHandler;
try {
process.Start();
process.BeginOutputReadLine();
process.BeginErrorReadLine();
if (process.WaitForExit(environment.Timeout) && outputWaitHandle.WaitOne(environment.Timeout) && errorWaitHandle.WaitOne(environment.Timeout))
{
if (process.ExitCode != 0 && !File.Exists(outputFilePath))
{
throw new QPDFException(String.Format("QPDF conversion of '{0}' failed. QPDF output: \r\n{1}", document.InputFilePath, error));
}
}
else
{
if (!process.HasExited)
{
process.Kill();
}
throw new QPDFTimeoutException();
}
}
finally {
process.OutputDataReceived -= outputHandler;
process.ErrorDataReceived -= errorHandler;
}
}
}
// setup our output callback!
if (qoutput.OutputCallback != null)
{
byte[] pdfFileBytes = File.ReadAllBytes(outputFilePath);
qoutput.OutputCallback(document, pdfFileBytes);
}
}
finally {
// delete the output file if we have specified too
if (deleteOutput && File.Exists(outputFilePath))
{
File.Delete(outputFilePath);
}
// now check the input
if (deleteInput && File.Exists(document.InputFilePath))
{
File.Delete(document.InputFilePath);
}
}
}
public static void ModifyPDF(QPDFDocument document, QPDFOutput output)
{
ModifyPDF(document, null, output);
}
