Reply To: getting TW_EXTIMAGEINFO

[zelvak]

So, i send trace info into the text file, and this is result for extimageinfo :

Standard ExtImageInfo Start

1200 4608 BarCodeX                 0                        UInt32    5         Success

1201 4609 BarCodeY                 0                        UInt32    5         Success

1202 4610 BarCodeText                                       Str255    12        Success

1203 4611 BarCodeType              4294967295               UInt32    5         Success

...

1219 4633 BarCodeCount             0                        Int32     2         Success

121A 4634 BarCodeConfidence        0                        Int32     2         Success

121B 4635 BarCodeRotation          0                        UInt32    5         Success

121C 4636 BarCodeTextLength        0                        UInt32    5         Success

Standard ExtImageInfo Finished

strange is, that opentwain crash after acquiring image on HP N7710 (Epson RX585 and HP 4500C are ok). Problem was in twCapability.vb / m_ReadStr255 – when trying to read bytes from pointer returned by ACAP_XFERMECH, TWEI_BOOKNAME and TWEI_CAMERA. Try and catch on

byt = Runtime.InteropServices.Marshal.ReadByte(fixPtr, Position)

solved this, but i dont know where is the problem…