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The binary files are imported using a filter that skips the header, could this be slowing things down?

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Hi Patrick,

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The binary files are imported using a filter that skips the header, could this be slowing things down?

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As far as I can tell the Import Wizard imports binary numbers one at a time which is reliable but not particularly efficient. I'm sure you could import at least 10x faster with a custom built Origin C function. If you are not comfortable with Origin C perhaps I can help. I would need the following information from your import filter...

>> From page 2 of Import Wizard(Header Bytes)
1. Number of header bytes.
2. Big-Endian byte order. (checked or not)

>> From page 3 (Data Pattern)
The Pattern (Column, Type, Size, Count).

Screen shots of both pages would be great.

>> I also need to know the file extension.

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 07/27/2007 1:50:35 PM

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how do I view a filter once it has been saved as an OIF?

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void ImpTest()
{
	StringArray saFiletypes;
	saFiletypes.SetSize( 5 );
	saFiletypes[0]="[*.chz] *.CHZ";
	saFiletypes[1]="[*.chy] *.CHY";
	saFiletypes[2]="[*.chx] *.CHX";
	saFiletypes[3]="[*.chh] *.CHH";
	saFiletypes[4]="[*.*] *.*";

	string strFile = GetOpenBox(saFiletypes);
	if( !strFile.IsFile() ) return;
	
	bool bIsLittleEndian = false; // bigendian
	int iHeaderSize = 512; // header bytes
	
	file fp;
	fp.Open(strFile, file::modeRead);
	int nPts = fp.GetLength();
	nPts -= iHeaderSize;
	nPts /= sizeof(int);
	vector<int> vi(nPts);
	fp.Seek(iHeaderSize, file::begin);
	int bGood = fp.ReadInt(&vi, sizeof(int), nPts, bIsLittleEndian);
	fp.Close();
	
	if( !bGood ) return;
	Worksheet wks;
	wks.Create(); // new worksheet
	wks.DeleteCol(0); // delete X column
	Dataset ds(wks,0);
	ds = vi;
}