Bug in newest Twacker 11/22/2011

[Travis]

Not sure where to report bugs about the sample applications.

In the file DCA_ACQ.C in the function “static void DoMemTransfer(HWND hWnd)” there is the calculation to populate the BITMAPINFOHEADER.biXPelsPerMeter. This calculation is incorrect for the case of TWUN_INCHES:

Incorrect Code (currently being distributed)
pdib->bmiHeader.biXPelsPerMeter = (LONG)((XRes*2.54)*100);
pdib->bmiHeader.biYPelsPerMeter = (LONG)((YRes*2.54)*100);

Corrected Code:
pdib->bmiHeader.biXPelsPerMeter = (LONG)((XRes/2.54)*100);
pdib->bmiHeader.biYPelsPerMeter = (LONG)((YRes/2.54)*100);

or you can change it to this:
pdib->bmiHeader.biXPelsPerMeter = (LONG)((XRes*39.3700787)*100);
pdib->bmiHeader.biYPelsPerMeter = (LONG)((YRes*39.3700787)*100);

Line numbers are 1422 and 1423.

[peterp]

Thanks for reporting that. It will be fixed in the next update of the sample source code.

[Author]

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