public override MemoryStream ExtractStream(string pathToFile) { try { var thumbnailBytes = OleDataReader.GetRawBytes(pathToFile, RevitFileMap.OleStreams.IMAGE_STREAM); return(ExtractStream(thumbnailBytes)); } catch (Exception ex) { throw new InvalidDataException($"Failed to extract the thumbnail of the following Revit file \"{pathToFile}\"", ex); } }
public override MemoryStream ExtractStream(MemoryStream memoryStream) { try { var thumbnailBytes = OleDataReader.GetRawBytes(memoryStream, RevitFileMap.OleStreams.IMAGE_STREAM); return(ExtractStream(thumbnailBytes)); } catch (Exception ex) { throw new InvalidDataException($"Failed to extract the thumbnail of the Revit file", ex); } }
/// <summary> /// Gets the properties. /// </summary> /// <param name="filePath">The file path.</param> /// <returns></returns> internal static Dictionary <string, string> GetProperties(string filePath) { var basicInfo = OleDataReader.GetRawBytes(filePath, "BasicFileInfo"); var fileProps = new Dictionary <string, string>(); var supportedEncodeings = new[] { Encoding.Unicode, Encoding.BigEndianUnicode, Encoding.UTF8, Encoding.ASCII, Encoding.Default, }; foreach (var encoding in supportedEncodeings) { var basicInfoString = encoding.GetString(basicInfo)?.TrimEnd('\u0a0d'); using var basicInfoReader = new StringReader(basicInfoString); // ReSharper disable once RedundantAssignment var stringLine = basicInfoReader.ReadLine(); // skip the first line while (!string.IsNullOrWhiteSpace(stringLine = basicInfoReader.ReadLine())) { var parts = stringLine.Split(new[] { ":" }, 2, StringSplitOptions.None); if (parts.Length != 2) { continue; } fileProps.Add(parts[0].Trim(), parts[1].Trim()); } if (fileProps.Any()) { break; } } return(fileProps); }
/// <summary> /// Extracts the stream. /// </summary> /// <param name="pathToFile">The path to file.</param> /// <returns></returns> /// <exception cref="InvalidDataException"></exception> public override MemoryStream ExtractStream(string pathToFile) { try { var thumbnailBytes = OleDataReader.GetRawBytes(pathToFile, RevitFileMap.OleStorage.IMAGE_STREAM); // Validate preview data or go out if ((thumbnailBytes == null) || (thumbnailBytes.Length <= 0)) { return(null); } // read past the Revit meta-data to the start of the PNG image var startingOffset = GetPngOffset(thumbnailBytes); if (startingOffset == 0) { return(null); } var previewUpperBound = thumbnailBytes.GetUpperBound(0); var pngDataBuffer = new byte[previewUpperBound - startingOffset + 1]; using (var ms = new MemoryStream(thumbnailBytes)) { ms.Position = startingOffset; ms.Read(pngDataBuffer, 0, pngDataBuffer.Length); // read the PNG image data into a byte array var outms = new MemoryStream(pngDataBuffer); return(outms); } } catch (Exception ex) { throw new InvalidDataException($"Failed to extract the thumbnail of the following Revit file \"{pathToFile}\"", ex); } }