Objective-C API Reference - Video Methods

• Decode

  Method	Description
  startFrameDecoding	Starts a new thread to decode barcodes from the inner frame queue.
  startFrameDecodingEx	Starts a new thread to decode barcodes from the inner frame queue.
  appendFrame	Appends a frame image buffer to the inner frame queue.
  stopFrameDecoding	Stops the frame decoding thread created by StartFrameDecoding.

• Parameter

  Method	Description
  getFrameDecodingParameters	Initialize frame decoding parameter.

• Delegate

  Method	Description
  setDBRErrorDelegate	Set callback function to process errors generated during frame decoding.
  setDBRTextResultDelegate	Set callback function to process text results generated during frame decoding.
  setDBRIntermediateResultDelegate	Set callback function to process intermediate results generated during frame decoding.

• Status retrieval

  Method	Description
  getLengthOfFrameQueue	Get length of current inner frame queue.

startFrameDecoding

Starts a new thread to decode barcodes from the inner frame queue.

-(void)startFrameDecoding:(NSInteger)maxQueueLength
            maxResultQueueLength:(NSInteger)maxResultQueueLength
            width:(NSInteger)width
            height:(NSInteger)height
            stride:(NSInteger)stride
            format:(EnumImagePixelFormat)format
            templateName:(NSString* _Nonnull)templateName
            error:(NSError* _Nullable * _Nullable)error;

Parameters

[in] maxQueueLength The max number of frames waiting for decoding.
[in] maxResultQueueLength The max number of frames whose results (text result/localization result) will be kept.
[in] width The width of the frame image in pixels.
[in] height The height of the frame image in pixels.
[in] stride The stride (or scan width) of the frame image.
[in] format The image pixel format used in the image byte array.
[in] templateName The template name.
[in,out] error Input a pointer to an error object. If an error occurs, this pointer is set to an actual error object containing the error information. You may specify nil for this parameter if you do not want the error information.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
NSError __autoreleasing * _Nullable error;
[barcodeReader startFrameDecoding:2 maxResultQueueLength:10 width:1024 height:720 stride:720 format:EnumImagePixelFormatBinary templateName:@"" error:&error];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let error: NSError? = NSError()
barcodeReader.startFrameDecoding(maxQueueLength:2, maxResultQueueLength:10, width:1024, height:720, stride:720, format:EnumImagePixelFormat.Binary, templateName:"", error:&error)

startFrameDecodingEx

Start a new thread to decode barcodes from the inner frame queue with specific frame decoding setting defined in iFrameDecodingParameters struct.

-(void)startFrameDecodingEx:(iFrameDecodingParameters* _Nullable) parameters
                templateName:(NSString* _Nonnull)templateName
                    error:(NSError* _Nullable __autoreleasing* _Nullable)error;

Parameters

[in] parameters The frame decoding parameters.
[in] templateName The template name.
[in,out] error Input a pointer to an error object. If an error occurs, this pointer is set to an actual error object containing the error information. You may specify nil for this parameter if you do not want the error information.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
NSError __autoreleasing * _Nullable error;
iFrameDecodingParameters *parameters = [barcodeReader getFrameDecodingParameters:nil];
parameters.maxQueueLength = 2;
parameters.maxResultQueueLength = 10;
parameters.width = 1024;
parameters.height = 720;
parameters.stride = 720;
parameters.imagePixelFormat = EnumImagePixelFormatBinary;
[barcodeReader startFrameDecodingEx:parameters templateName:@"" error:&error];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let error: NSError? = NSError()
let parameters = barcodeReader.getFrameDecodingParameters
parameters?.maxQueueLength = 2
parameters?.maxResultQueueLength = 10
parameters?.width = 1024
parameters?.height = 720
parameters?.stride = 720
parameters?.imagePixelFormat = EnumImagePixelFormat.Binary
barcodeReader.StartFrameDecodingEx(parameter: parameters!, templateName: "", error: &error)

appendFrame

Appends a frame image buffer to the inner frame queue.

-(NSInteger)appendFrame:(NSData* _Nullable) bufferBytes;

Parameters

[in] bufferBytes The array of bytes which contain the image data.

Return value

Returns the ID of the appended frame.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
NSError __autoreleasing * _Nullable error;
[barcodeReader startFrameDecoding:2 maxResultQueueLength:10 width:1024 height:720 stride:720 format:EnumImagePixelFormatBinary templateName:@"" error:&error];
NSInteger frameId = [barcodeReader appendFrame:bufferBytes];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let error: NSError? = NSError()
barcodeReader.startFrameDecoding(maxQueueLength:2, maxResultQueueLength:10, width:1024, height:720, stride:720, format:EnumImagePixelFormat.Binary, templateName:"", error:&error)
let frameId = barcodeReader.appendFrame(bufferBytes:bufferBytes)

stopFrameDecoding

Stops the frame decoding thread created by startFrameDecoding or startFrameDecodingEx.

-(void)stopFrameDecoding:(NSError* _Nullable * _Nullable)error;

Parameters

[in,out] error Input a pointer to an error object. If an error occurs, this pointer is set to an actual error object containing the error information. You may specify nil for this parameter if you do not want the error information.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
NSError __autoreleasing * _Nullable error;
[barcodeReader startFrameDecoding:2 maxResultQueueLength:10 width:1024 height:720 stride:720 format:EnumImagePixelFormatBinary templateName:@"" error:&error];
[barcodeReader stopFrameDecoding:&error];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let error: NSError? = NSError()
barcodeReader.startFrameDecoding(maxQueueLength:2, maxResultQueueLength:10, width:1024, height:720, stride:720, format:EnumImagePixelFormat.Binary, templateName:"", error:nil)
barcodeReader.stopFrameDecoding(error:&error)

getFrameDecodingParameters

Initialize frame decoding parameters with default values.

-(iFrameDecodingParameters*_Nullable)getFrameDecodingParameters:(NSError* _Nullable * _Nullable)error;

Parameters

[in,out] error Input a pointer to an error object. If an error occurs, this pointer is set to an actual error object containing the error information. You may specify nil for this parameter if you do not want the error information.

Return value

Returns frame decoding parameters.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
iFrameDecodingParameters *parameters = [barcodeReader getFrameDecodingParameters:nil];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let parameters = barcodeReader.getFrameDecodingParameters(error: nil)

setDBRErrorDelegate

Sets callback function to process errors generated during frame decoding.

-(void)setDBRErrorDelegate:(id _Nullable)errorDelegate userData:(NSObject* _Nullable)userData;

Parameters

[in] errorDelegate Callback function.
[in] userData Customized arguments passed to your function.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
[barcodeReader setDBRErrorDelegate:self userData:nil];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
barcodeReader.setDBRErrorDelegate(errorDelegate:self, userData:nil)

setDBRTextResultDelegate

Set callback function to process text results generated during frame decoding.

-(void)setDBRTextResultDelegate:(id _Nullable)textResultDelegate userData:(NSObject* _Nullable)userData;

Parameters

[in] textResultDelegate Callback function.
[in] userDataCustomized arguments passed to your function.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
[barcodeReader setDBRTextResultDelegate:self userData:nil];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
barcodeReader.setDBRTextResultDelegate(textResultDelegate:self, userData:nil)

setDBRIntermediateResultDelegate

Set callback function to process intermediate results generated during frame decoding.

-(void)setDBRIntermediateResultDelegate:(id _Nullable)intermediateResultDelegate userData:(NSObject* _Nullable)userData;	

Parameters

[in] intermediateResultDelegate Callback function.
[in] userData Customized arguments passed to your function.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
[barcodeReader setDBRIntermediateResultDelegate:self userData:nil];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
barcodeReader.setDBRIntermediateResultDelegate(intermediateResultDelegate:self, userData:nil)

getLengthOfFrameQueue

Get length of current inner frame queue.

-(NSInteger)getLengthOfFrameQueue;

Return value

Returns the length of the inner frame queue.

Code Snippet

Objective-C:

DynamsoftBarcodeReader *barcodeReader;
barcodeReader = [[DynamsoftBarcodeReader alloc] initWithLicense:@"t0260NwAAAHV***************"];
NSInteger length = [barcodeReader getLengthOfFrameQueue];

Swift:

let barcodeReader = DynamsoftBarcodeReader.init(license: "t0260NwAAAHV***************")
let length = barcodeReader.getLengthOfFrameQueue()