Barcode Reader SDK使用教程：Web摄像机读取条码

Web摄像机如何读取条码？本教程将分享在Barcode Reader SDK中用Web摄像机当做条码读取器读取条码。以C#代码为例为大家展示：

当用户启动开始时，摄像机里面所产生的画面作为图片。

// <summary>
/// Function to read barcodes from image (used by new created Thread object)
/// </summary>
public void <span data-scayt_word="startImageProcessing" data-scaytid="2">startImageProcessing</span>()
{
try
{
// work while user has not changed the status to false (i.e. false <span data-scayt_word="meanse" data-scaytid="3">meanse</span> user canceled the scan)
while (STATUS)
{
// get current frame bitmap from camera using <span data-scayt_word="Touchless" data-scaytid="4">Touchless</span> lib
Bitmap bitmap = MANAGER.CurrentCamera.GetCurrentImage();
// search for bar codes
<span data-scayt_word="findBarcodes" data-scaytid="5">findBarcodes</span>(bitmap);

// wait for a little to lower the CPU load
Thread.Sleep(SCAN_DELAY);
}
}
catch
{
; // suppress errors if any
}
}

 

BarCode Reader SDK浏览图片读取条码

/// <summary>
/// Finds barcodes from bitmap object
/// </summary>
/// <param name="img">input bitmap
private void <span data-scayt_word="findBarcodes" data-scaytid="8">findBarcodes</span>(Bitmap <span data-scayt_word="img" data-scaytid="10">img</span>)
{
// create barcode object
Reader reader = new Reader();

// limit to <span data-scayt_word="1D" data-scaytid="12">1D</span> barcodes search only (<span data-scayt_word="2d" data-scaytid="14">2d</span> are not included to speed up search)
// change to SymbologyFilter.FindAll to scan for all possible <span data-scayt_word="1D" data-scaytid="13">1D</span> and <span data-scayt_word="2D" data-scaytid="15">2D</span> barcodes
reader.TypeToFind = <span data-scayt_word="GetBarcodeTypeToFindFromCombobox" data-scaytid="16">GetBarcodeTypeToFindFromCombobox</span>();

// you may optimize processing by setting number of barcodes per page
//reader.MaxNumberOfBarcodesPerPage = 1;

// read barcodes from bitmap
reader.ReadFrom(<span data-scayt_word="img" data-scaytid="11">img</span>);

// save current time
String <span data-scayt_word="timeNow" data-scaytid="17">timeNow</span> = string.Format("{0:<span data-scayt_word="HH" data-scaytid="19">HH</span>:mm:<span data-scayt_word="ss" data-scaytid="20">ss</span>:<span data-scayt_word="tt" data-scaytid="21">tt</span>}", DateTime.Now);

// check barcode scan results
if (reader.FoundBarcodes.Length > 0)
{
textAreaBarcodes.SelectionStart = 0;
textAreaBarcodes.SelectionLength = 0;
textAreaBarcodes.SelectedText = "\<span data-scayt_word="nTime" data-scaytid="22">nTime</span>: " + <span data-scayt_word="timeNow" data-scaytid="18">timeNow</span> + "\n";

// insert barcodes into the text area output
<span data-scayt_word="foreach" data-scaytid="23">foreach</span> (<span data-scayt_word="FoundBarcode" data-scaytid="24">FoundBarcode</span> barcode in reader.FoundBarcodes)
{
// make a sound that we found the barcode (not working on <span data-scayt_word="x64" data-scaytid="25">x64</span> due to Microsoft changed it)
Console.Beep();
// form the string with barcode value
String <span data-scayt_word="barcodeValue" data-scaytid="26">barcodeValue</span> = String.Format("Found: {0} {1}" + "\r\n", barcode.Type, barcode.Value);
// add barcode to the text area output
textAreaBarcodes.SelectedText = <span data-scayt_word="barcodeValue" data-scaytid="27">barcodeValue</span> + "\n";
// add barcode to the list of saved barcodes
m_foundBarcodes.Add(barcode);
// increase counter of found barcodes
<span data-scayt_word="foundBarcodesCount" data-scaytid="28">foundBarcodesCount</span>++;
// update status text with number of barcodes
lblFoundBarcodes.Text = String.Format("Found {0} barcodes:", <span data-scayt_word="foundBarcodesCount" data-scaytid="29">foundBarcodesCount</span>);
}
}
// make flickering for "Scanning..." label
lblScanning.Visible = !lblScanning.Visible;
lblScanning.Update();

}

 

本文译自Barcode