Image capturing via SNAPI.dll API for Symbol barcode scanner DS4208

问题

I want to capture image via SNAPI API from Symbol (currently Zebra) barcode scanner, model DS4208 (we're also using another but compatible models from Zebra). Barcode capturing/recognition works pretty well, but looks like SnapiDLL.SNAPI_SnapShot(hScanner) call don't work correctly: no WM_XFERSTATUS message received at all. Here is small & simplified code snippet:

// Set image format
short[] parms = new short[2] { (short)SnapiParamIds.ImageFileType, (short)SnapiImageTypes.Jpeg };
var retCode = SnapiDLL.SNAPI_SetParameters(parms, 2, _devHandles[0]);
Debug.WriteLine($"SNAPI_SetParameters retCode={retCode}");
Application.DoEvents();
Thread.Sleep(50);

retCode = SnapiDLL.SNAPI_SnapShot(_devHandles[0]);
Debug.WriteLine($"SNAPI_SnapShot retCode={retCode}");
Application.DoEvents();
Thread.Sleep(50);

retCode = SnapiDLL.SNAPI_PullTrigger(_devHandles[0]);
Debug.WriteLine($"SNAPI_PullTrigger retCode={retCode}");
Application.DoEvents();
Thread.Sleep(50);

Return codes always 0 (i.e. no error), but no WM_XFERSTATUS message received by my message handler.

P.S. C# application from Zebra's SDK which is using CoreScanner driver and OCX, is working fine and able to capture images and video. But I'd like to avoid CoreScanner driver installation for some reasons; for barcode scanning small and simple SNAPI.dll works pretty fine, and I expect to get it work for image capturing too - probably, I'm doing something wrong...

P.P.S. Guys, please DO NOT COMMENT if you have NO EXPERIENCE WORKING WITH SYMBOL BARCODE SCANNERS & SNAPI, and CAN NOT PROVIDE a working snippet!

回答1:

After contacting Zebra tech support (they are successors of Symbol/Motorola barcode scanner business), I figured out that the imaging/video functionality is broken in SNAPI.dll for the x64 OSes (but most of the rest API calls are working properly). Unfortunately, SNAPI isn't supported by Zebra anymore, and I should use Zebra's CoreScanner API. The good news is: this API is working fine, as it supposed to be. Not a very good news: I should use additional installation package from Zebra.

来源：https://stackoverflow.com/questions/58562096/image-capturing-via-snapi-dll-api-for-symbol-barcode-scanner-ds4208

标签

barcode-scanner