/// <summary>
/// 打开shp、shx文件流
/// 读取shp、shx信息时需要首先执行此操作
/// 同时操作头文件读取和ShxRecord、ShpRecord示例化
/// </summary>
/// <param name="ofs"></param>
public void Open(Stream shpStream, Stream shxStream)
{
if (mShpFile != null)
{
Close();
}
mShpFile = shpStream;
mShxFile = shxStream;
mShpFileReader = null;
mShpFileWriter = null;
mShxFileReader = null;
mShxFileWriter = null;
if (mShpFile.CanRead)
{
mShpFileReader = new BinaryReader(mShpFile);
}
if (mShpFile.CanWrite)
{
mShpFileWriter = new BinaryWriter(mShpFile);
}
if (mShxFile.CanRead)
{
mShxFileReader = new BinaryReader(mShxFile);
}
if (mShxFile.CanWrite)
{
mShxFileWriter = new BinaryWriter(mShxFile);
}
//reset position
mRecordsReadCount = 0;
//assume header is not written
mHeaderWritten = false;
//read the header
if (shpStream.CanRead)
{
//try to read the header...
try
{
mHeader.Read(mShpFileReader);
mHeaderWritten = true;
}
catch (EndOfStreamException)
{
//could not read header, file is empty
mHeader = new ShpHeader();
mHeaderWritten = false;
}
}
if (mShpFile != null)
{
mIsReadOnly = !mShpFile.CanWrite;
mIsForwardOnly = !mShpFile.CanSeek;
}
mShxRecord = new ShxRecord(mHeader);
mShpRecord = new ShpRecord(mHeader);
}
/// <summary>
/// 写入文件
/// </summary>
/// <param name="shpStream"></param>
/// <param name="shxStream"></param>
public void Creat(Stream shpStream, Stream shxStream)
{
if (mShpFile != null)
{
Close();
}
mShpFile = shpStream;
mShxFile = shxStream;
mShpFileWriter = null;
mShxFileWriter = null;
//if (mShpFile.CanRead)
// mShpFileReader = new BinaryReader(mShpFile);
if (mShpFile.CanWrite)
{
mShpFileWriter = new BinaryWriter(mShpFile);
}
//if (mShxFile.CanRead)
// mShxFileReader = new BinaryReader(mShxFile);
if (mShxFile.CanWrite)
{
mShxFileWriter = new BinaryWriter(mShxFile);
}
//reset position
//mRecordsReadCount = 0;
//assume header is not written
mFileCreat = true;
if (mShpFile != null)
{
mIsReadOnly = !mShpFile.CanWrite;
mIsForwardOnly = !mShpFile.CanSeek;
}
//mShxRecord = new ShxRecord(mHeader);
mShpRecord = new ShpRecord(mHeader);
}