ViscomSoft Software

C# - How to Read Barcodes from scanned documents

Step 1: To install the Scanner SDK ActiveX Control, begin by launching the setup file (http://www.viscomsoft.com/demo/scannersetup.exe). Select the desired installation folder for the Scanner ActiveX and continue with the installation on your development computer.

Step 2: Create New Visual C# Project, select Windows Application. 

Step 3: The next step is to install Scanner ActiveX in ToolBox. Select Toolbox, select Components item, right click mouse button, select Choose Items...

Step 4: Select COM Components tab, select Scanner ActiveX Control , click OK.

Step 5: Now you will see the Scanner ActiveX's icon on toolbox, drag it to form.

Step 6: Add Combo box, two buttons , label and textbox on form. Like the following picture.

Step 7: change the name property of textbox  to "txttotalpage" 

Step 8: In form load event, add the following code to add the image source item to combo box.

 short iCount = this.axScanner1.GetNumImageSources();
            for (short i = 0; i < iCount; i )
            {
                this.comboBox1.Items.Add(this.axScanner1.GetImageSourceName(i));
            }
            if (this.comboBox1.Items.Count > 0)
                this.comboBox1.SelectedIndex = 0;
Step 9: add the following code in Scan button click event , assume your scanner support Auto Feeder, if not set FeederEnabled = false, make sure you set BufferResizeMode = false , we need keep the barcode quality , so do not resize the buffer.

           this.axScanner1.SelectImageSourceByIndex((short)this.comboBox1.SelectedIndex);
            this.axScanner1.FeederEnabled = true;
            this.axScanner1.DPI = 200;
            this.axScanner1.SetCaptureArea(0, 0, 0, 0);
            this.axScanner1.BufferResizeMode = false;
            this.axScanner1.Scan();

Step 10: select the Scanner Control, Click Event icon in Properties Windows, double EndScan Event to add the EndScan Event hander.



Step 11: In EndScan event handler , add the following code to get the total scanned page to textbox 

  txttotalpage.Text = this.axScanner1.TotalPage.ToString();

Step 12: Add the following code on "Read Barcodes for All Pages" button click event.

            string str1="";
            string strTmp = "";

            axScanner1.BarCodeReadScanMultiple = true;
            axScanner1.BarCodeReadScanWithoutRotation = true;
            axScanner1.BarCodeReadScan45Rotation = true;
            axScanner1.BarCodeReadScan45CouterRotation = true;
            axScanner1.BarCodeReadScan90Rotation = true;
            axScanner1.BarCodeReadScanAccuracy = true;

            long ibarcodeCount = 0;
            long ibarcodeCountforpage = 0;

            for (int i = 0; i < axScanner1.TotalPage; i )
            {

                axScanner1.SetActivePageNo((short)(i 1));

            
                ibarcodeCountforpage = axScanner1.BarCodeReadFullPage();

                if (ibarcodeCountforpage < 1)
                {
                    MessageBox.Show("No barcodes found, try scan to high DPI or set the specific area for detect the barcode");
                    break;
                }

                for (int j = 0; j < ibarcodeCountforpage; j )
                {
                    strTmp = axScanner1.BarCodeGetType((short)j).ToString() " score:" axScanner1.BarCodeGetScore((short)j).ToString() " value:" axScanner1.BarCodeGetValue((short)j).ToString();

                    strTmp = strTmp "rn" strTmp;
            
                }

                ibarcodeCount = ibarcodeCount ibarcodeCountforpage;

           
            }
              str1 = "Total " ibarcodeCount.ToString() " BarCode detected" "rn" strTmp;

            MessageBox.Show(str1);
        }

Step 13: Now run the project, select the scanner device, click Scan button, after scanned all pages, click "Read Barcodes for All Pages" button


Download the C# How to Read Barcodes from scanned documents sample source code