private static /*int*/ void WriteRecordToFile(BigEndianBinaryWriter shpBinaryWriter,
BigEndianBinaryWriter shxBinaryWriter, ShapeHandler handler, IGeometry body, int oid)
{
if (body == null || body.IsEmpty)
{
WriteNullShapeRecord(shpBinaryWriter, shxBinaryWriter, oid);
return;
}
// Get the length of each record (in bytes)
var recordLength = handler.ComputeRequiredLengthInWords(body);
// Get the position in the stream
var pos = shpBinaryWriter.BaseStream.Position;
shpBinaryWriter.WriteIntBE(oid);
shpBinaryWriter.WriteIntBE(recordLength);
// update shapefile index (position in words, 1 word = 2 bytes)
var posWords = pos / 2;
if (shxBinaryWriter != null)
{
shxBinaryWriter.WriteIntBE((int)posWords);
shxBinaryWriter.WriteIntBE(recordLength);
}
handler.Write(body, shpBinaryWriter, body.Factory);
/*return recordLength;*/
}
private static void WriteNullShapeRecord(BigEndianBinaryWriter shpBinaryWriter,
BigEndianBinaryWriter shxBinaryWriter, int oid)
{
const int recordLength = 12;
// Update shapefile index (position in words, 1 word = 2 bytes)
var posWords = shpBinaryWriter.BaseStream.Position / 2;
if (shxBinaryWriter != null)
{
shxBinaryWriter.WriteIntBE((int)posWords);
shxBinaryWriter.WriteIntBE(recordLength);
}
// Add shape
shpBinaryWriter.WriteIntBE(oid);
shpBinaryWriter.WriteIntBE(recordLength);
shpBinaryWriter.Write((int)ShapeGeometryType.NullShape);
}
/// <summary>
/// Writes a shapefile header to the given stream;
/// </summary>
/// <param name="file">The binary writer to use.</param>
public void Write(BigEndianBinaryWriter file)
{
if (file == null)
{
throw new ArgumentNullException("file");
}
if (_fileLength == -1)
{
throw new InvalidOperationException("The header properties need to be set before writing the header record.");
}
var pos = 0;
file.WriteIntBE(_fileCode);
pos += 4;
for (var i = 0; i < 5; i++)
{
file.WriteIntBE(0);//Skip unused part of header
pos += 4;
}
file.WriteIntBE(_fileLength);
pos += 4;
file.Write(_version);
pos += 4;
var format = EnumUtility.Format(typeof(ShapeGeometryType), _shapeType, "d");
file.Write(int.Parse(format));
pos += 4;
// Write the bounding box
file.Write(_bounds.MinX);
file.Write(_bounds.MinY);
file.Write(_bounds.MaxX);
file.Write(_bounds.MaxY);
pos += 8 * 4;
// Skip remaining unused bytes
for (int i = 0; i < 4; i++)
{
file.Write(0.0); // Skip unused part of header
pos += 8;
}
}
