Flutter Document Scanner SDK for TWAIN, WIA, SANE, ICA and eSCL Scanners

A Flutter plugin that enables you to develop cross-platform applications for digitizing documents from TWAIN (32-bit/64-bit), WIA, SANE, ICA and eSCL scanners. The plugin offers callable methods for both open-source TWAIN (64-bit only) and the Dynamic Web TWAIN Service REST API.

⚙️ Prerequisites

✅ Install Dynamic Web TWAIN Service

• Windows: Dynamsoft-Service-Setup.msi
• macOS: Dynamsoft-Service-Setup.pkg
• Linux:
  • Dynamsoft-Service-Setup.deb
  • Dynamsoft-Service-Setup-arm64.deb
  • Dynamsoft-Service-Setup-mips64el.deb
  • Dynamsoft-Service-Setup.rpm

🔑 Get a License

Request a free trial license.

🧩 Configuration

After installation, open http://127.0.0.1:18625/ in your browser to configure the host and port settings.

By default, the service is bound to 127.0.0.1. To access it across the LAN, change the host to your local IP (e.g., 192.168.8.72).

📡 REST API Endpoints

https://www.dynamsoft.com/web-twain/docs/info/api/restful.html

📚 API Reference for Dynamic Web TWAIN Service

Scanner Methods

Method	Description
Future<List<dynamic>> getDevices(String host, [int? scannerType])	Get a list of scanning devices
Future<Map<String, dynamic>> createJob(String host, Map<String, dynamic> parameters)	Create a scanning job
Future<Map<String, dynamic>> checkJob(String host, String jobId)	Check the status of a scan job
Future<Map<String, dynamic>> updateJob(String host, String jobId, Map<String, dynamic> parameters)	Update a scan job (e.g., cancel it)
Future<void> deleteJob(String host, String jobId)	Delete a scan job
Future<List<String>> getImageFiles(String host, String jobId, String directory)	Download and save scanned images
Future<List<Uint8List>> getImageStreams(String host, String jobId)	Get scanned images as byte streams
Future<Map<String, dynamic>> getImageInfo(String host, String jobId)	Get info about the next scanned image
Future<Map<String, dynamic>> getScannerCapabilities(String host, String jobId)	Get supported scanner settings

The scanner parameter configuration is based on Dynamsoft Web TWAIN documentation.

Document Methods

Method	Description
Future<Map<String, dynamic>> createDocument(String host, Map<String, dynamic> parameters)	Create a document
Future<Map<String, dynamic>> getDocumentInfo(String host, String docId)	Get document metadata
Future<bool> deleteDocument(String host, String docId)	Delete a document
Future<String> getDocumentFile(String host, String docId, String directory)	Download a document PDF to local disk
Future<Uint8List?> getDocumentStream(String host, String docId)	Get a document as a byte stream
Future<Map<String, dynamic>> insertPage(String host, String docId, Map<String, dynamic> parameters)	Insert a new page into a document
Future<bool> deletePage(String host, String docId, String pageId)	Delete a page from a document

🖥️ API Reference for Open Source TWAIN (Windows 64-bit only)

Scanner Methods

Method	Description
Future<List<String>> getDataSources()	Get a list of TWAIN compatible scanners
Future<List<String>> scanDocument(int sourceIndex)	Scan documents from a selected scanner