CameraStartDecoding (Function)

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CameraStartDecoding (Function)

In french: CaméraDémarreDécodage

Starts decoding bar codes in a Camera control. You have the ability to specify the type of bar codes to decode.

Example

// Starts decoding QRCode bar codes in the Camera control
CameraStartDecoding(CAM_Camera1, BC_QRCODE)

Syntax

CameraStartDecoding(<Camera control> [, <Type of bar code>])

<Camera control>: Control name

Name of Camera control to use.

<Type of bar code>: Optional Integer constant

Type of bar codes that can be decoded:
BC_AZTEC Aztec bar code.
This type of bar code is available from iOS 7.
BC_CODE128 Code128 bar code.
This type of bar code is available from iOS 7.
BC_CODE39 Code39 bar code.
This type of bar code is available from iOS 7.
BC_CODE93 Code93 bar code.
This type of bar code is available from iOS 7.
BC_DATAMATRIX DATAMATRIX bar code.
Not available.
BC_EAN13 EAN13 bar code.
This type of bar code is available from iOS 7.
BC_EAN8 EAN8 bar code.
This type of bar code is available from iOS 7.
BC_INTER2OF5 Interleaved 2 of 5 bar code.
This type of bar code is available from iOS 7.
BC_PDF417 PDF417 bar code.
This type of bar code is available from iOS 7.
BC_QRCODE QR Code bar code.
BC_UPCA UPC-A bar code.
Not available.
BC_UPCE UPC-E bar code.
This type of bar code is available from iOS 7.
BC_ALL All the types of bar codes supported by this function can be decoded.

If this parameter is not specified:
the bar codes specified during the last call to CameraStartDecoding will be decoded.
the bar codes specified in the description window of Camera control will be decoded.

Remarks

The Camera control must have been configured to allow the decoding of bar codes (in the description window). Otherwise, the call to CameraStartDecoding will trigger a fatal error.
When the Camera control is configured to allow the decoding of bar codes (in the description window), the decoding automatically starts when opening the window. To prevent this behavior, you can call CameraStopDecoding in the event "Initializing" of the Camera control.
If CameraStartDecoding is called while a decoding is already in progress in the Camera control, the decoding is stopped then it is restarted to take into account the new type of bar code to decode. If the type of bar code is identical, the function has no effect.
When a bar code is detected, the event "Decoding a bar code" of the Camera control is called with a BarCode variable as parameter, which corresponds to the detected bar code. If this event returns True, bar code decoding will be automatically stopped.
This function is equivalent to VideoStartDecoding.

Component : wd250android.jar