private void dataGridViewTraceHeader_CellValueChanged(object sender, DataGridViewCellEventArgs e)
{
if (!changeActive)
{
return;
}
if (f == null)
{
return; // file not open
}
if (e.ColumnIndex != 4 && e.ColumnIndex != 5)
{
return; // only edit value set or increment
}
SEGYTraceHeader fh = f.currentTrace.TraceHeader; // active object
int rowid = e.RowIndex;
propertyInfos = typeof(SEGYTraceHeader).GetProperties();
PropertyInfo p = propertyInfos[rowid];
object val;
try
{
val = Convert.ChangeType(dataGridViewTraceHeader.Rows[rowid].Cells[e.ColumnIndex].Value, p.PropertyType);
}
catch (SystemException ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
dataGridViewTraceHeader.Rows[rowid].Cells[3].Value = p.GetValue(fh, null);
return;
}
p.SetValue(fh, val, null);
refreshTraceHeader();
}
/// <summary>
/// initilize trace structure
/// </summary>
/// <param name="isBigEndian">is the file big endian or little endian</param>
/// <param name="format">format of data word length according to SEGY standard</param>
/// <param name="number_of_points_in_trace">format of data word length according to SEGY standard</param>
///
public void Intialize(bool isBigEndian, int format, int number_of_points_in_trace = 0)
{
iSEGYTraceData = new SEGYTraceData();
iSEGYTraceData.Initialize(format, isBigEndian, number_of_points_in_trace);
iSEGYTraceHeader = new SEGYTraceHeader();
iSEGYTraceHeader.Initialize(isBigEndian);
iformat = format;
}
/// <summary>
/// read the file header from disk
/// </summary>
/// <param name="br">binary reader stream</param>
/// <returns>true if successful</returns>
public bool ReadFileHeader(BinaryReader br)
{
this.br = br;
// read text header
byte[] t0 = br.ReadBytes(3200);
//remove pre-initialized vaue
this.ExtendedTextHeader.Clear();
this.ExtendedTextHeader.Add(t0); // note 1st TextHeader block is alwats the firsr 3200 bytes in the file
// read file header
byte[] fh = br.ReadBytes(400);
this.BinaryFileHeader = fh;
// check byte order
BigEndian = isBigEndian();
positionOfStartOfDataTraces = br.BaseStream.Position; // record the positionTraceReacorded of the start of the data traces
// check SEGY revision - SEGY Version 1.0 encoded as 0100 base 16.
if (this.segyFormatRevisionNumber >= 256)
{
if ((int)this.numberOfExtendedTextualFileHeaderRecordsFollowing < 100)
{
// may have extended headers
for (int i = 0; i < (int)this.numberOfExtendedTextualFileHeaderRecordsFollowing; i++)
{
t0 = br.ReadBytes(3200);
this.ExtendedTextHeader.Add(t0);
}
}
else
{
this.detectedSEGYVer0 = true; // probably
}
}
long saveposition = br.BaseStream.Position;
// sometimes the file is SEGY rev 0 and there is crap in the header fields
// let's check to see is the next trace makes sense
SEGYTraceHeader th = new SEGYTraceHeader();
th.Initialize(this.isBigEndian());
th.TraceHeaderBuffer = br.ReadBytes(240);
if (th.yearDataRecorded < 1950 || th.yearDataRecorded > 2050)
{
this.detectedSEGYVer0 = true;
}
if (th.dayOfYear < 1 || th.dayOfYear > 366)
{
this.detectedSEGYVer0 = true;
}
if (th.hourOfDay < 0 || th.hourOfDay > 24)
{
this.detectedSEGYVer0 = true;
}
if (th.minuteOfHour < 0 || th.minuteOfHour > 60)
{
this.detectedSEGYVer0 = true;
}
if (th.secondOfMinute < 0 || th.secondOfMinute > 60)
{
this.detectedSEGYVer0 = true;
}
if (this.detectedSEGYVer0)
{
br.BaseStream.Position = positionOfStartOfDataTraces;
this.ExtendedTextHeader.RemoveRange(1, ExtendedTextHeader.Count - 1);
}
else
{
br.BaseStream.Position = br.BaseStream.Position - 240; // backup last header read
}
positionOfStartOfDataTraces = br.BaseStream.Position; // record the positionTraceReacorded of the start of the data traces
isSEGYFileHeaderAscii = isFileHeaderASCII();
return(true);
}
