Can not test failed case and convert raw data image to image src

[pdhung197]

Dear HID,

First, I'm testing event of fingerprint reader, but I can not test the "failed" case. In QualityReport, I alway receive data like this:

deviceId: "8C630117-B87E-6B47-8D2E-5AAF6EAACC9A"
quality: 0
type: "QualityReported"

.... even when I intentionally put my whole hand on chin on the device. Another cases can not test because no event's called. So, how can I test the failed case and got correct quality (put whole the hand or chin on the device can not is a good quality case).

The second. I use this solution to convert Sample raw data to image src but seem like no luck, or have something wrong in my code. This is my code: In SampleAcquired event:

const { Data: rawData } = samples[0];
const sampleImageUrl = 'data:image/png;base64,' + btoa(Utf8.fromBase64Url(rawData));
this.imgString = sampleImageUrl;

In template: <img [src]="imgString" alt="" /> And the result like this:

Is there any mistake from me that make the code not work? :(

[pdhung197]

1. Duplicate with #17
2. Solved in #11

Close issue.

[a-bronx]

Thanks for reporting.

Typing for the SamplesAcquired needs to be fixed, and more detailed documentation needed for different types of sample formats. Will keep the issue open until that.

[a-bronx]

Some findings for reference:

• for the SampleFormat.Raw, the BioSample.Data member appears to be a base64url-encoded octet-stream of a bitmap content, while bitmap metadata is encoded in a BioSample.Format member missing in BioSample typing:

  {
  "Compression": 0                  //<< missing in BioSample typing
  "Data": "........",
  "Format": {                       //<< missing in BioSample typing
  "iHeight": 550,
  "iWidth": 500,
  "iXdpi": 700,
  "iYdpi": 700,
  "uBPP": 8,
  "uDataType": 1,
  "uImageType": 2,
  "uPadding": 2,
  "uPlanes": 1,
  "uPolarity": 2,
  "uRGBcolorRepresentation": 0,
  "uSignificantBpp": 8
  },
  "Header": {                       //<< does not match BioSampleHeader typing
  "DeviceId": 72345365437350147,
  "DeviceType": 6296422711555,
  "iDataAcquisitionProgress": 100,
  "uDataType":1
  },
  "Version":1
  }

• For the SampleFormat.PngImage, it is reported that SamplesAcquired.samples member is not BioSample[] but Base64UrlString[], where each element of the array is a base64url-encoded PNG image.