public Drawing(Stream drawingContent, FileDetail fileDetail)
{
if (drawingContent == null)
{
throw new ArgumentNullException("drawingContent");
}
if (fileDetail == null)
{
throw new ArgumentNullException("fileDetail");
}
_drawingContent = drawingContent;
_fileDetail = fileDetail;
}
void IInitializeWithStream.Initialize(IStream pstream, uint grfMode)
{
try
{
if (_previewForm == null)
{
return;
}
_previewForm.Reset();
_fileDetail = _GetPreviewFileDetail(pstream);
_previewFileStream = pstream.ToStream().ToMemoryStream();
Marshal.ReleaseComObject(pstream);
}
catch (Exception exc)
{
Trace.TraceError("PreviewHandlerController.Initialize: {0}", exc);
}
}
public void OnPreviewRequired(Stream stream, FileDetail fileDetail)
{
if (stream == null)
{
throw new ArgumentNullException("stream");
}
if (fileDetail == null)
{
throw new ArgumentNullException("fileDetail");
}
if (!stream.CanRead)
{
throw new ArgumentException("Stream must be readable", "stream");
}
TokenSource.Cancel();
TokenSource = new CancellationTokenSource();
FileStream = stream;
FileDetail = fileDetail;
DisplayPreview = true;
PreviewRequired?.Invoke(this, EventArgs.Empty);
}
public async Task <GeneratePreviewResult> GeneratePreview(Stream drawingContent, FileDetail fileDetail, Size previewSize, CancellationToken token)
{
if (drawingContent == null)
{
throw new ArgumentNullException(nameof(drawingContent));
}
if (fileDetail == null)
{
throw new ArgumentNullException(nameof(fileDetail));
}
if (!drawingContent.CanRead)
{
throw new ArgumentException("Stream must be readable", nameof(drawingContent));
}
var process = new Process
{
StartInfo =
{
FileName = Path.Combine(_settings.DotApplicationPath),
RedirectStandardInput = true,
RedirectStandardOutput = true,
RedirectStandardError = true,
UseShellExecute = false,
CreateNoWindow = true,
Arguments = "-T" + _settings.RenderingFormat.ToString().ToLower()
},
EnableRaisingEvents = true
};
process.Start();
var baseOutputStream = process.StandardOutput.BaseStream;
var baseErrorStream = process.StandardError.BaseStream;
var drawingStreamSansBom = _streamHelper.ExcludeBomFromStream(drawingContent);
await drawingStreamSansBom.CopyToAsync(process.StandardInput.BaseStream);
process.StandardInput.BaseStream.Close();
var outputStream = new MemoryStream();
baseOutputStream.CopyTo(outputStream);
var errorStream = new MemoryStream();
baseErrorStream.CopyTo(errorStream);
process.WaitForExit();
if (errorStream.Length > 0)
{
errorStream.Seek(0, SeekOrigin.Begin);
var message = new StreamReader(errorStream).ReadToEnd();
return(new GeneratePreviewResult(message));
}
if (process.ExitCode != 0)
{
return(new GeneratePreviewResult("Failed to render drawing: " + process.ExitCode));
}
outputStream.Seek(0, SeekOrigin.Begin);
return(new GeneratePreviewResult(outputStream));
}
