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 Attaching integer datasets

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T O P I C    R E V I E W
additive Posted - 10/09/2006 : 4:07:30 PM
Origin Version (7.5G, SR6):
Operating System: Win2k

Is there a way to attach a dataset based on a worksheet column with long / integer as internal data type? In contrast to a "double column", the attach method fails.

I suppose that is because some mathematical functions might fail for integer types as a message box tells me when changing the data type. But this is rather annoying because I cannot use existing code with ds[] notation ... Thus, I have to check every dataset before attaching or have to change it temporarily ...

Any idea?

--Michael
2   L A T E S T    R E P L I E S    (Newest First)
additive Posted - 10/10/2006 : 06:11:57 AM
Looks like it would be the best to prefer vector base for general worksheet access.
Thanks a lot for your quick answer!

--Michael
zachary_origin Posted - 10/10/2006 : 05:09:35 AM
Hi Micheal,

You can define the dataset as a integer dataset using Dataset<int> ds; Alternatively, if the data type for the worksheet column is not known, you can use the GetDataObject() method to get it as a vectorbase and then make manipulation on the data.
The following examples give the details:


void Integer_DataSet(int nCol = 1)
{
	Worksheet wks = Project.ActiveLayer();
	Dataset<int> dsA;	
	dsA.Attach(wks,nCol);
	dsA.SetSize(20);
	dsA[2]=9;

}


void Column_Type_Unknown(int nCol = 1, double ff = 2)
{	
	Worksheet wks = Project.ActiveLayer();
	Column cc(wks, nCol);	
	if(cc)	
		{		
			vectorbase& vb = cc.GetDataObject();		
			vector vv;		
			vv = vb;				
			vv *= ff;		
			vb = vv;	
		}
}




Zachary
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