Image is not captured if (_bitmapInfo.XPelsPerMeter == 0 || _bitmapInfo.YPelsPerMeter == 0)

[throwaway1290304032]

Hi,

In one of my scanning devices, I was getting no image transferred when I sent the scan request through TwainDotNet, even though the device itself did the scanning.

After some guesswork I found the offending line:

bitmap.SetResolution(PpmToDpi(_bitmapInfo.XPelsPerMeter), PpmToDpi(_bitmapInfo.YPelsPerMeter));

It looks like my scanning device is setting _bitmapInfo.XPelsPerMeter = 0 and _bitmapInfo.YPelsPerMeter == 0, so the call to SetResolution fails with 'Invalid Parameter'.

Fixing it is trivial by skipping the call or setting some sensible default if those fields are set to zero.

Thanks, throwaway1290304032

[tmyroadctfig]

Could you please issue a pull request with your fix?