public bool TryOpen(string filename, byte[] bytes, params object[] args)
{
_filename = filename;
if (!filename.ToUpper().EndsWith(".SHP"))
{
return(false);
}
if (string.IsNullOrEmpty(filename))
{
throw new NullReferenceException("new ShapeFilesReader(null)");
}
if (!File.Exists(filename))
{
throw new FileNotFoundException(filename);
}
string mainFile = filename;
string dir = Path.GetDirectoryName(filename);
string shxFile = Path.Combine(dir, Path.GetFileNameWithoutExtension(filename) + ".shx");
if (!File.Exists(shxFile))
{
throw new FileNotFoundException(shxFile);
}
_dbffile = Path.Combine(dir, Path.GetFileNameWithoutExtension(filename) + ".dbf");
if (!File.Exists(_dbffile))
{
throw new FileNotFoundException(_dbffile);
}
string prjFile = Path.Combine(dir, Path.GetFileNameWithoutExtension(filename) + ".prj");
if (File.Exists(prjFile))
{
ParseProjectionInfo(prjFile);
}
//
_fields = ParseDbfToDataTable.GetFields(_dbffile);
_fsMainFile = new FileStream(mainFile, FileMode.Open, FileAccess.Read);
_brMainFile = new BinaryReader(_fsMainFile);
_fsShxFile = new FileStream(shxFile, FileMode.Open, FileAccess.Read);
_brShxFile = new BinaryReader(_fsShxFile);
//查看对应的注记文件是否存在
try
{
string anndbf = Path.Combine(Path.GetDirectoryName(_dbffile), Path.GetFileNameWithoutExtension(_dbffile) + "_注记.dbf");
if (File.Exists(anndbf))
{
_annReader = new AnnotationDbfReader(anndbf);
}
}
catch (Exception ex)
{
Log.WriterException("EsriShapeFilesReader", "TryOpen", ex);
}
//读文件头
ReadHeader();
//
return(true);
}
public float Estimate(string filename, out int featureCount, out int fieldCount)
{
featureCount = 0;
fieldCount = 0;
if (!filename.ToUpper().EndsWith(".SHP"))
{
return(0);
}
if (string.IsNullOrEmpty(filename))
{
throw new NullReferenceException("new ShapeFilesReader(null)");
}
if (!File.Exists(filename))
{
throw new FileNotFoundException(filename);
}
string mainFile = filename;
string dir = Path.GetDirectoryName(filename);
string shxFile = Path.Combine(dir, Path.GetFileNameWithoutExtension(filename) + ".shx");
if (!File.Exists(shxFile))
{
throw new FileNotFoundException(shxFile);
}
string dbffile = Path.Combine(dir, Path.GetFileNameWithoutExtension(filename) + ".dbf");
if (!File.Exists(dbffile))
{
throw new FileNotFoundException(dbffile);
}
string[] fields = ParseDbfToDataTable.GetFields(dbffile);
fieldCount = fields != null ? fields.Length : 0;
float memorySize = ComputeSizeAndCount(mainFile, shxFile, out featureCount);
memorySize += fieldCount * 100; //100 bytes per fieldvalue + fieldName
return(memorySize / 1024f / 1024f);
}