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Table of contents
Swift
Objective-C

Getting Started with Dynamsoft Barcode Reader SDK C++ Edition

In this guide, you will learn step by step how to build a barcode reading application with Dynamsoft Barcode Reader SDK using C++.

Learn more aboutDynamsoft Barcode Reader Features

Installation

If you haven’t downloaded the SDK yet,download theC/C++ Package now and unpack it into a directory of your choice.

For this tutorial, we will unpack it to a pseudo directory named[INSTALLATION FOLDER]. Please change it to your preferred unpacking path for the following content.

To find out whether your environment is supported, please read theSystem Requirements.

Build Your First Application

Let’s start by creating a console application that demonstrates how to use the minimum code to read barcodes from an image file.

You candownload the entire source code from here.

Create a New Project

For Windows

  1. Open Visual Studio. Go to “File > New > Project…” or click “Create a new project” on the starting page, choose “Console App”, create a new Empty Project, and set the Project name asDBRCPPSample.
  2. Add a new source file namedDBRCPPSample.cpp into the project.

For Linux

Create a new source file namedDBRCPPSample.cpp and place it into the folder[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Samples.

Include the Library

Add headers and libraries inDBRCPPSample.cpp.

#include<iostream>#include<string>#include"[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Include/DynamsoftCaptureVisionRouter.h"usingnamespacestd;usingnamespacedynamsoft::license;usingnamespacedynamsoft::cvr;usingnamespacedynamsoft::dbr;#if defined(_WIN64) || defined(_WIN32)#ifdef _WIN64#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x64/DynamsoftCorex64.lib")#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x64/DynamsoftLicensex64.lib")#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x64/DynamsoftCaptureVisionRouterx64.lib")#else#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x86/DynamsoftCorex86.lib")#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x86/DynamsoftLicensex86.lib")#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x86/DynamsoftCaptureVisionRouterx86.lib")#endif#endif

Initialize a Capture Vision Router Instance

Initialize the License Key

charerrorMsg[512];CLicenseManager::InitLicense("DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9",errorMsg,512);

The string “DLS2eyJvcmdhbml6YXRpb25JRCI6IjIwMDAwMSJ9” here is a free public trial license. Note that network connection is required for this license to work. Alternatively, you can request a 30-dayoffline free trial license from theCustomer Portal.

Create a Capture Vision Router Instance

CCaptureVisionRouter*cvRouter=newCCaptureVisionRouter;

Decode and Output Results

Decode barcodes from an image file.

stringimageFile="[PATH-TO-A-BARCODE-IMAGE]";CCapturedResult*result=cvRouter->Capture(imageFile.c_str(),CPresetTemplate::PT_READ_BARCODES);if(result->GetErrorCode()!=0){cout<<"Error: "<<result->GetErrorCode()<<", "<<result->GetErrorString()<<endl;}CDecodedBarcodesResult*barcodeResult=result->GetDecodedBarcodesResult();if(barcodeResult==nullptr||barcodeResult->GetItemsCount()==0){cout<<"No barcode found."<<endl;}else{intbarcodeResultItemCount=barcodeResult->GetItemsCount();cout<<"Decoded "<<barcodeResultItemCount<<" barcodes"<<endl;for(intj=0;j<barcodeResultItemCount;j++){constCBarcodeResultItem*barcodeResultItem=barcodeResult->GetItem(j);cout<<"Result "<<j+1<<endl;cout<<"Barcode Format: "<<barcodeResultItem->GetFormatString()<<endl;cout<<"Barcode Text: "<<barcodeResultItem->GetText()<<endl;}}

Release the Allocated Memory

if(barcodeResult)barcodeResult->Release();result->Release();deletecvRouter,cvRouter=NULL;

Build and Run the Project

For Windows

  1. In Visual Studio, set the solution to build asRelease|x64.
  2. Build the project to generate the programDBRCPPSample.exe.
  3. CopyALL*.dll files under[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x64 to the same folder as theDBRCPPSample.exe.
  4. Copy the folder[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Templates to the same folder as theDBRCPPSample.exe.
  5. Run the programDBRCPPSample.exe.

For Linux

  1. Open a terminal and navigate to the target directory whereDBRCPPSample.cpp is located.

  2. Build the sample:

     g++-o DBRCPPSample DBRCPPSample.cpp-lDynamsoftCaptureVisionRouter-lDynamsoftLicense-lDynamsoftCore-lDynamsoftUtility-L ../Dist/Lib/Linux/x64-Wl,-rpath=../Dist/Lib/Linux/x64-std=c++11

  3. Copy the preset template:

    cp-r ../Dist/Templates ../Dist/Lib/Linux/x64/

  4. Run the program:

     ./DBRCPPSample

Process Multiple Images

If you need to process multiple images, follow these steps:

These steps follow the stepInitialize a Capture Vision Router Instance mentioned above.

You candownload the entire source code from here.

Add an Image Source as the Input

The classCDirectoryFetcher is capable of converting a local directory to an image source. We will use it to connect multiple images to the image-processing engine.

Include additionalDynamsoftUtility module.

// Add the following linesusingnamespacedynamsoft::utility;#ifdef _WIN64#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x64/DynamsoftUtilityx64.lib")#else#pragma comment(lib, "[INSTALLATION FOLDER]/DynamsoftBarcodeReader/Dist/Lib/Windows/x86/DynamsoftUtilityx86.lib")#endif

Set up aCDirectoryFetcher object to retrieve image data sources from a directory.

CDirectoryFetcher*fetcher=newCDirectoryFetcher;fetcher->SetDirectory("[THE DIRECTORY THAT HOLDS THE IMAGES]");cvRouter->SetInput(fetcher);

Add a Result Receiver as the Output

Create a classMyCapturedResultReceiver to implement theCCapturedResultReceiver interface, and get the barocde results inOnDecodedBarcodesReceived callback function.

classMyCapturedResultReceiver:publicCCapturedResultReceiver{voidOnDecodedBarcodesReceived(CDecodedBarcodesResult*pResult){constCFileImageTag*tag=dynamic_cast<constCFileImageTag*>(pResult->GetOriginalImageTag());cout<<"File: "<<tag->GetFilePath()<<endl;if(pResult->GetErrorCode()!=EC_OK){cout<<"Error: "<<pResult->GetErrorString()<<endl;}intcount=pResult->GetItemsCount();cout<<"Decoded "<<count<<" barcodes"<<endl;for(inti=0;i<count;i++){constCBarcodeResultItem*barcodeResultItem=pResult->GetItem(i);if(barcodeResultItem!=NULL){cout<<"Result "<<i+1<<endl;cout<<"Barcode Format: "<<barcodeResultItem->GetFormatString()<<endl;cout<<"Barcode Text: "<<barcodeResultItem->GetText()<<endl;}}cout<<endl;}};

Create and register aMyCapturedResultReceiver object as the result receiver.

CCapturedResultReceiver*capturedReceiver=newMyCapturedResultReceiver;cvRouter->AddResultReceiver(capturedReceiver);

Add an Object to Listen to the Status of the Image Source

Create a classMyImageSourceStateListener to implement theCImageSourceStateListenter interface, and call StopCapturing inOnImageSourceStateReceived callback function when the state isISS_EXHAUSTED.

classMyImageSourceStateListener:publicCImageSourceStateListener{private:CCaptureVisionRouter*m_router;public:MyImageSourceStateListener(CCaptureVisionRouter*router){m_router=router;}virtualvoidOnImageSourceStateReceived(ImageSourceStatestate){if(state==ISS_EXHAUSTED)m_router->StopCapturing();}};

Create and register aMyImageSourceStateListener object as the listener.

CImageSourceStateListener*listener=newMyImageSourceStateListener(cvRouter);cvRouter->AddImageSourceStateListener(listener);

Start the Process

Call the methodStartCapturing() to start processing all the images in the specified folder.

interrorCode=cvRouter->StartCapturing(CPresetTemplate::PT_READ_BARCODES,true,errorMsg,512);

During the process, the callback functionOnDecodedBarcodesReceived() is triggered each time an image finishes processing. After all images are processed, the listener functionOnImageSourceStateReceived() will return the image source state asISS_EXHAUSTED and the process is stopped with the methodStopCapturing().

Release the Allocated Memory

deletecvRouter,cvRouter=NULL;deletefetcher,fetcher=NULL;deletelistener,listener=NULL;deletecapturedReceiver,capturedReceiver=NULL;

Build and Run the Project Again

Refer to the steps inBuild and Run the Project.

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