// The combine methods take a list of TTM files/surfaces and merge them all into a
// single coherent surface
// procedure Combine(const TTMSurfaces : TOwnedObjectList); overload;
// procedure Combine(const TTMFiles : TStringList); overload;
public static bool ReadHeaderFromFile(string FileName,
out TTMHeader Header)
{
Header = TTMHeader.NewHeader();
bool result = false;
try
{
using (FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader reader = new BinaryReader(fs))
{
Header.Read(reader);
// Check signature
string signature = ASCIIEncoding.ASCII.GetString(Header.FileSignature).Substring(0, Consts.TTMFileIdentifier.Length);
if (Consts.TTMFileIdentifier.Equals(signature))
{
// Check file version
if (Header.FileMajorVersion == Consts.TTMMajorVersion && Header.FileMinorVersion == Consts.TTMMinorVersion)
result = true;
}
}
}
}
catch
{
result = false;
}
return result;
}
// procedure RemoveDuplicateTriangles;
public static bool IsTTMFile(string FileName, out string ErrorMsg)
{
ErrorMsg = "Error reading header";
try
{
TTMHeader Header = TTMHeader.NewHeader();
using (FileStream fs = new FileStream(FileName, FileMode.Open, FileAccess.Read, FileShare.Read))
{
using (BinaryReader reader = new BinaryReader(fs))
{
Header.Read(reader);
// Check signature
string signature = ASCIIEncoding.ASCII.GetString(Header.FileSignature).Substring(0, Consts.TTMFileIdentifier.Length);
if (!Consts.TTMFileIdentifier.Equals(signature))
{
ErrorMsg = "File is not a Trimble TIN Model.";
return false;
}
// Check file version
if (Header.FileMajorVersion != Consts.TTMMajorVersion || Header.FileMinorVersion != Consts.TTMMinorVersion)
{
ErrorMsg = $"TTM.IsTTMFile(): Unable to read this version {Header.FileMajorVersion}: {Header.FileMinorVersion} of Trimble TIN Model file. Expected version: { Consts.TTMMajorVersion}: {Consts.TTMMinorVersion}";
return false;
}
return true;
}
}
}
catch (Exception E)
{
ErrorMsg = ErrorMsg + "\n" + E.Message;
return false;
}
}
public void Read(BinaryReader reader)
{
string LoadErrMsg = "";
Loading = true;
try
{
try
{
LoadErrMsg = "Error reading header";
Header = TTMHeader.NewHeader();
Header.Read(reader);
var identifier = Encoding.ASCII.GetString(Header.FileSignature);
if (identifier != Consts.TTMFileIdentifier)
{
throw new TTMFileReadException("File is not a Trimble TIN Model.");
}
// Check file version
if (Header.FileMajorVersion != Consts.TTMMajorVersion
|| Header.FileMinorVersion != Consts.TTMMinorVersion)
{
throw new TTMFileReadException($"TTM.Read(): Unable to read this version {Header.FileMajorVersion}: {Header.FileMinorVersion} of Trimble TIN Model file. Expected version: { Consts.TTMMajorVersion}: {Consts.TTMMinorVersion}");
}
Clear();
ModelName = ASCIIEncoding.ASCII.GetString(Header.DTMModelInternalName).TrimEnd(new []{'\0'});
LoadErrMsg = "Error reading vertices";
reader.BaseStream.Position = Header.StartOffsetOfVertices;
(Vertices as TTMVertices).Read(reader, Header);
LoadErrMsg = "Error reading triangles";
reader.BaseStream.Position = Header.StartOffsetOfTriangles;
(Triangles as TTMTriangles).Read(reader, Header, Vertices);
LoadErrMsg = "Error reading edges";
reader.BaseStream.Position = Header.StartOffsetOfEdgeList;
Edges.Read(reader, Header, Triangles as TTMTriangles);
LoadErrMsg = "Error reading start points";
reader.BaseStream.Position = Header.StartOffsetOfStartPoints;
StartPoints.Read(reader, Header, Triangles);
}
catch (TTMFileReadException)
{
Clear();
throw; // pass it on
}
catch (Exception E)
{
Clear();
throw new TTMFileReadException($"Exception at TTM loading phase {LoadErrMsg}", E);
}
}
finally
{
Loading = false;
}
}