ByteScout Premium Suite – C# – Human Assisted Invoice Parsing

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ByteScout Premium Suite – C# – Human Assisted Invoice Parsing

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ByteScout-Premium-Suite-C-sharp-Human-Assisted-Invoice-Parsing.pdf

human assisted invoice parsing in C# using ByteScout Premium Suite

Learn to code human assisted invoice parsing in C#: How-To tutorial

This page explains the steps and algorithm of implementing human assisted invoice parsing and how to make it work in your application. ByteScout Premium Suite helps with human assisted invoice parsing in C#. ByteScout Premium Suite is the set that includes 12 SDK products from ByteScout including tools and components for PDF, barcodes, spreadsheets, screen video recording.

If you want to quickly learn then these fast application programming interfaces of ByteScout Premium Suite for C# plus the guideline and the C# code below will help you quickly learn human assisted invoice parsing. Just copy and paste this C# sample code to your C# application’s code editor, add a reference to ByteScout Premium Suite (if you haven’t added yet) and you are ready to go! Updated and detailed documentation and tutorials are available along with installed ByteScout Premium Suite if you’d like to learn more about the topic and the details of the API.

If you want to try other samples for C# then free trial version of ByteScout Premium Suite is available on our website.

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Form1.Designer.cs

      namespace SampleApplication
{
	partial class Form1
	{
		/// <summary>
		/// Required designer variable.
		/// </summary>
		private System.ComponentModel.IContainer components = null;

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		/// <param name="disposing">true if managed resources should be disposed; otherwise, false.</param>
		protected override void Dispose(bool disposing)
		{
			if (disposing && (components != null))
			{
				components.Dispose();
			}
			base.Dispose(disposing);
		}

		#region Windows Form Designer generated code

		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
			this.pdfViewerControl1 = new Bytescout.PDFViewer.PDFViewerControl();
			this.toolStrip1 = new System.Windows.Forms.ToolStrip();
			this.tsbOpen = new System.Windows.Forms.ToolStripButton();
			this.panel1 = new System.Windows.Forms.Panel();
			this.btnClear = new System.Windows.Forms.Button();
			this.btnGetData = new System.Windows.Forms.Button();
			this.rbSelectTotal = new System.Windows.Forms.RadioButton();
			this.rbSelectCustomerInfo = new System.Windows.Forms.RadioButton();
			this.rbSelectInvoiceNumber = new System.Windows.Forms.RadioButton();
			this.toolStrip1.SuspendLayout();
			this.panel1.SuspendLayout();
			this.SuspendLayout();
			// 
			// pdfViewerControl1
			// 
			this.pdfViewerControl1.AllowResizeSelectionRectangles = true;
			this.pdfViewerControl1.BackColor = System.Drawing.SystemColors.ButtonShadow;
			this.pdfViewerControl1.ClearSelectionOnClick = false;
			this.pdfViewerControl1.Dock = System.Windows.Forms.DockStyle.Fill;
			this.pdfViewerControl1.Location = new System.Drawing.Point(179, 25);
			this.pdfViewerControl1.MouseMode = Bytescout.PDFViewer.MouseMode.Selection;
			this.pdfViewerControl1.MultiSelectMode = true;
			this.pdfViewerControl1.Name = "pdfViewerControl1";
			this.pdfViewerControl1.RegistrationKey = null;
			this.pdfViewerControl1.RegistrationName = null;
			this.pdfViewerControl1.SelectionColor = System.Drawing.Color.Red;
			this.pdfViewerControl1.SelectionModifierKey = Bytescout.PDFViewer.SelectionModifierKeys.None;
			this.pdfViewerControl1.Size = new System.Drawing.Size(829, 708);
			this.pdfViewerControl1.TabIndex = 0;
			this.pdfViewerControl1.CurrentPageIndexChanged += new System.EventHandler(this.pdfViewerControl1_CurrentPageIndexChanged);
			this.pdfViewerControl1.SelectionChanged += new System.EventHandler(this.pdfViewerControl1_SelectionChanged);
			this.pdfViewerControl1.CustomPaint += new System.Windows.Forms.PaintEventHandler(this.pdfViewerControl1_CustomPaint);
			this.pdfViewerControl1.DocumentChanged += new System.EventHandler(this.pdfViewerControl1_DocumentChanged);
			// 
			// toolStrip1
			// 
			this.toolStrip1.Items.AddRange(new System.Windows.Forms.ToolStripItem[] {
            this.tsbOpen});
			this.toolStrip1.Location = new System.Drawing.Point(0, 0);
			this.toolStrip1.Name = "toolStrip1";
			this.toolStrip1.Size = new System.Drawing.Size(1008, 25);
			this.toolStrip1.TabIndex = 1;
			this.toolStrip1.Text = "toolStrip1";
			// 
			// tsbOpen
			// 
			this.tsbOpen.Image = global::SampleApplication.Properties.Resources.folder_page;
			this.tsbOpen.ImageTransparentColor = System.Drawing.Color.Magenta;
			this.tsbOpen.Name = "tsbOpen";
			this.tsbOpen.Size = new System.Drawing.Size(80, 22);
			this.tsbOpen.Text = "&Open PDF";
			this.tsbOpen.Click += new System.EventHandler(this.tsbOpen_Click);
			// 
			// panel1
			// 
			this.panel1.Controls.Add(this.btnClear);
			this.panel1.Controls.Add(this.btnGetData);
			this.panel1.Controls.Add(this.rbSelectTotal);
			this.panel1.Controls.Add(this.rbSelectCustomerInfo);
			this.panel1.Controls.Add(this.rbSelectInvoiceNumber);
			this.panel1.Dock = System.Windows.Forms.DockStyle.Left;
			this.panel1.Location = new System.Drawing.Point(0, 25);
			this.panel1.Name = "panel1";
			this.panel1.Size = new System.Drawing.Size(179, 708);
			this.panel1.TabIndex = 2;
			// 
			// btnClear
			// 
			this.btnClear.Enabled = false;
			this.btnClear.Location = new System.Drawing.Point(93, 126);
			this.btnClear.Name = "btnClear";
			this.btnClear.Size = new System.Drawing.Size(75, 23);
			this.btnClear.TabIndex = 4;
			this.btnClear.Text = "Clear";
			this.btnClear.UseVisualStyleBackColor = true;
			this.btnClear.Click += new System.EventHandler(this.btnClear_Click);
			// 
			// btnGetData
			// 
			this.btnGetData.Enabled = false;
			this.btnGetData.Font = new System.Drawing.Font("Tahoma", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(204)));
			this.btnGetData.Location = new System.Drawing.Point(12, 97);
			this.btnGetData.Name = "btnGetData";
			this.btnGetData.Size = new System.Drawing.Size(156, 23);
			this.btnGetData.TabIndex = 3;
			this.btnGetData.Text = "Get Data";
			this.btnGetData.UseVisualStyleBackColor = true;
			this.btnGetData.Click += new System.EventHandler(this.btnGetData_Click);
			// 
			// rbSelectTotal
			// 
			this.rbSelectTotal.AutoSize = true;
			this.rbSelectTotal.Enabled = false;
			this.rbSelectTotal.Location = new System.Drawing.Point(12, 66);
			this.rbSelectTotal.Name = "rbSelectTotal";
			this.rbSelectTotal.Size = new System.Drawing.Size(93, 17);
			this.rbSelectTotal.TabIndex = 2;
			this.rbSelectTotal.Text = "Select TOTAL";
			this.rbSelectTotal.UseVisualStyleBackColor = true;
			// 
			// rbSelectCustomerInfo
			// 
			this.rbSelectCustomerInfo.AutoSize = true;
			this.rbSelectCustomerInfo.Enabled = false;
			this.rbSelectCustomerInfo.Location = new System.Drawing.Point(12, 43);
			this.rbSelectCustomerInfo.Name = "rbSelectCustomerInfo";
			this.rbSelectCustomerInfo.Size = new System.Drawing.Size(123, 17);
			this.rbSelectCustomerInfo.TabIndex = 1;
			this.rbSelectCustomerInfo.Text = "Select Customer Info";
			this.rbSelectCustomerInfo.UseVisualStyleBackColor = true;
			// 
			// rbSelectInvoiceNumber
			// 
			this.rbSelectInvoiceNumber.AutoSize = true;
			this.rbSelectInvoiceNumber.Checked = true;
			this.rbSelectInvoiceNumber.Enabled = false;
			this.rbSelectInvoiceNumber.Location = new System.Drawing.Point(12, 20);
			this.rbSelectInvoiceNumber.Name = "rbSelectInvoiceNumber";
			this.rbSelectInvoiceNumber.Size = new System.Drawing.Size(133, 17);
			this.rbSelectInvoiceNumber.TabIndex = 0;
			this.rbSelectInvoiceNumber.TabStop = true;
			this.rbSelectInvoiceNumber.Text = "Select Invoice Number";
			this.rbSelectInvoiceNumber.UseVisualStyleBackColor = true;
			// 
			// Form1
			// 
			this.AutoScaleDimensions = new System.Drawing.SizeF(6F, 13F);
			this.AutoScaleMode = System.Windows.Forms.AutoScaleMode.Font;
			this.ClientSize = new System.Drawing.Size(1008, 733);
			this.Controls.Add(this.pdfViewerControl1);
			this.Controls.Add(this.panel1);
			this.Controls.Add(this.toolStrip1);
			this.Name = "Form1";
			this.StartPosition = System.Windows.Forms.FormStartPosition.CenterScreen;
			this.Text = "Form1";
			this.toolStrip1.ResumeLayout(false);
			this.toolStrip1.PerformLayout();
			this.panel1.ResumeLayout(false);
			this.panel1.PerformLayout();
			this.ResumeLayout(false);
			this.PerformLayout();

		}

		#endregion

		private Bytescout.PDFViewer.PDFViewerControl pdfViewerControl1;
		private System.Windows.Forms.ToolStrip toolStrip1;
		private System.Windows.Forms.ToolStripButton tsbOpen;
		private System.Windows.Forms.Panel panel1;
		private System.Windows.Forms.Button btnGetData;
		private System.Windows.Forms.RadioButton rbSelectTotal;
		private System.Windows.Forms.RadioButton rbSelectCustomerInfo;
		private System.Windows.Forms.RadioButton rbSelectInvoiceNumber;
		private System.Windows.Forms.Button btnClear;
	}
}

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Form1.cs

      using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Bytescout.PDFExtractor;

namespace SampleApplication
{
	public partial class Form1 : Form
	{
		List<String> _dataLabels = new List<string>();

		public Form1()
		{
			InitializeComponent();

			pdfViewerControl1.RegistrationName = "demo";
			pdfViewerControl1.RegistrationKey = "demo";
		}

		protected override void OnLoad(EventArgs e)
		{
			OpenDocument(@"Invoice.pdf");

			base.OnLoad(e);
		}

		private void tsbOpen_Click(object sender, EventArgs e)
		{
			using (OpenFileDialog openFileDialog = new OpenFileDialog())
			{
				openFileDialog.Title = @"Open PDF Document";
				openFileDialog.Filter = @"PDF Files (*.pdf)|*.pdf|All Files|*.*";

				if (openFileDialog.ShowDialog() == DialogResult.OK)
				{
					OpenDocument(openFileDialog.FileName);
				}
			}
		}

		private void OpenDocument(string filePath)
		{
			Text = filePath;

			Cursor = Cursors.WaitCursor;

			try
			{
				pdfViewerControl1.InputFile = filePath;
			}
			catch (Exception exception)
			{
				MessageBox.Show(exception.Message);
			}
			finally
			{
				Cursor = Cursors.Default;
			}
		}

		private void pdfViewerControl1_DocumentChanged(object sender, EventArgs e)
		{
			ClearSelections();
			UpdateControls();
		}

		private void pdfViewerControl1_CurrentPageIndexChanged(object sender, EventArgs e)
		{
			ClearSelections();
			UpdateControls();
		}

		private void btnClear_Click(object sender, EventArgs e)
		{
			ClearSelections();
			UpdateControls();
		}

		void ClearSelections()
		{
			_dataLabels.Clear();
			pdfViewerControl1.ClearSelection();
			UpdateControls();
		}

		void UpdateControls()
		{
			rbSelectInvoiceNumber.Enabled = pdfViewerControl1.IsDocumentLoaded;
			rbSelectCustomerInfo.Enabled = pdfViewerControl1.IsDocumentLoaded;
			rbSelectTotal.Enabled = pdfViewerControl1.IsDocumentLoaded;
			btnGetData.Enabled = pdfViewerControl1.IsDocumentLoaded && pdfViewerControl1.Selection.Length > 0;
			btnClear.Enabled = pdfViewerControl1.IsDocumentLoaded && pdfViewerControl1.Selection.Length > 0;
		}

		private void pdfViewerControl1_SelectionChanged(object sender, EventArgs e)
		{
			UpdateControls();

			if (pdfViewerControl1.Selection.Length > _dataLabels.Count)
			{
				for (int i = _dataLabels.Count; i < pdfViewerControl1.Selection.Length; i++)
				{
					string dataLabel;

					if (rbSelectInvoiceNumber.Checked)
						dataLabel = "Invoice Number:";
					else if (rbSelectCustomerInfo.Checked)
						dataLabel = "Customer Info:";
					else
						dataLabel = "TOTAL:";

					_dataLabels.Add(dataLabel);
				}
			}
		}

		private void pdfViewerControl1_CustomPaint(object sender, PaintEventArgs e)
		{
			Rectangle[] selection = pdfViewerControl1.Selection;

			// Paint labels
			for (int i = 0; i < selection.Length; i++)
			{
				Rectangle r = Rectangle.Round(selection[i]);
				r = pdfViewerControl1.TranslateRectangleToViewport(r);

				Size textSize = TextRenderer.MeasureText(_dataLabels[i], Font);
				Rectangle textRectangle = new Rectangle(r.Left, r.Top - textSize.Height - 6, textSize.Width + 2, textSize.Height + 2);

				e.Graphics.FillRectangle(Brushes.DarkBlue, textRectangle);
				TextRenderer.DrawText(e.Graphics, _dataLabels[i], Font, textRectangle, Color.White, TextFormatFlags.HorizontalCenter | TextFormatFlags.VerticalCenter);
			}

		}

		private void btnGetData_Click(object sender, EventArgs e)
		{
			StringBuilder result = new StringBuilder();
			RectangleF[] selection = pdfViewerControl1.SelectionInPoints;

			using (TextExtractor extractor = new TextExtractor())
			{
				extractor.RegistrationName = "demo";
				extractor.RegistrationKey = "demo";

				extractor.LoadDocumentFromFile(pdfViewerControl1.InputFile);
				extractor.OCRMode = OCRMode.Auto;
				extractor.OCRLanguageDataFolder = @"c:\Program Files\Bytescout PDF Extractor SDK\net4.00\tessdata\";
				extractor.OCRResolution = 300;

				for (int i = 0; i < selection.Length; i++)
				{
					extractor.SetExtractionArea(selection[i]);
					result.AppendLine(_dataLabels[i]);
					result.AppendLine(extractor.GetText(pdfViewerControl1.CurrentPageIndex, pdfViewerControl1.CurrentPageIndex));
					result.AppendLine();
				}		
			}

			MessageBox.Show(result.ToString());
		}
	}
}

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Program.cs

      using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace SampleApplication
{
	static class Program
	{
		/// <summary>
		/// The main entry point for the application.
		/// </summary>
		[STAThread]
		static void Main()
		{
			Application.EnableVisualStyles();
			Application.SetCompatibleTextRenderingDefault(false);
			Application.Run(new Form1());
		}
	}
}