在windows應用程序中使用條形碼掃描器C＃

Question

我開發了一個服裝商店的應用程序以在該應用程序中打印發票我想使用條形碼掃描儀從包含條形碼的物料標籤中自動收集信息並自動填充所有信息我的表格，然後打印發票。 請給出一些建議如何解決這個問題。 我也使用Microsoft.PointOfService庫。

Answer 1

通常，條形碼掃描器只是將所有識別的符號作爲標準鍵盤輸入發送。因此，當用戶將注意力集中在應用程序中的文本字段並掃描條形碼時，就像用戶手動輸入條形碼符號並按「Enter」（或任何其他鍵，取決於掃描儀設置）一樣。

Answer 2

假設在表單中有一個文本框，當條形碼掃描時，它會在文本框中鍵入條形碼字符。通常，一些掃描儀可以配置爲在掃描結束時添加另一個字符，通常是新行字符。藉此，您可以收聽文本框的KeyPress事件，並處理新行字符。當它被觸發時，那麼你可以檢索表單中的其他細節。

Answer 3

我有一個類在我的個人圖書館，以檢測掃描儀的工作原理：

public sealed class ScanReader 
{ 
    #region Delegates 

    public delegate void _DataLoaded(string ScannedData); 

    #endregion 

    private readonly double MyMaxMillisecondsBetweenPress; 
    private readonly List<Regex> MyRegex; 
    private readonly Timer TimeToNextKeyPress = new Timer(); 
    private string CardBuff = string.Empty; 
    private bool FirstKeyPress = true; 
    private DateTime Stamp; 

    /// <summary> 
    /// ScanReader constructor 
    /// </summary> 
    /// <param name="Press"> Form where KeyPreview = true </param> 
    /// <param name="Regs"> Regular expressions for filtering scanned data</param> 
    /// <param name="MaxMillisecondsBetweenPress"> The maximum time between pressing the keys in milliseconds, default = 60 </param> 
    public ScanReader(Form form, List<Regex> Regs = null, double MaxMillisecondsBetweenPress = 0) 
    { 
     MyRegex = Regs ?? null; 
     MyMaxMillisecondsBetweenPress = MaxMillisecondsBetweenPress == 0 ? 60 : MaxMillisecondsBetweenPress; 
     form.KeyPress += KeyPressed; 
     TimeToNextKeyPress.Interval = 
      Convert.ToInt32(MyMaxMillisecondsBetweenPress + MyMaxMillisecondsBetweenPress*0.2); 
     TimeToNextKeyPress.Tick += TimeToNextKeyPress_Tick; 
    } 

    public event _DataLoaded OnDataLoaded; 

    private void TimeToNextKeyPress_Tick(object sender, EventArgs e) 
    { 
     TimeToNextKeyPress.Stop(); 
     if (MyRegex.Count > 0) 
     { 
      foreach (Regex reg in MyRegex) 
      { 
       if (reg.IsMatch(CardBuff)) 
       { 
        OnDataLoaded(CardBuff); 
        return; 
       } 
      } 
     } 
     else 
      OnDataLoaded(CardBuff); 
    } 

    private void KeyPressed(object sender, KeyPressEventArgs e) 
    { 
     if (FirstKeyPress) 
     { 
      Stamp = DateTime.Now; 
      FirstKeyPress = false; 
      CardBuff = e.KeyChar.ToString(); 
     } 
     else 
     { 
      if ((DateTime.Now - Stamp).TotalMilliseconds < MyMaxMillisecondsBetweenPress) 
      { 
       Stamp = DateTime.Now; 
       CardBuff += e.KeyChar; 
      } 
      else 
      { 
       Stamp = DateTime.Now; 
       CardBuff = e.KeyChar.ToString(); 
      } 
     } 
     TimeToNextKeyPress.Stop(); 
     TimeToNextKeyPress.Start(); 
    } 
} 

如何使用：

var myReader = new ScanReader(this, new List<Regex> 
               { 
                new Regex(@"296\d{13,13}"), 
                new Regex(@"K%.{5,34}"), 
                new Regex(@"C%.{5,34}"), 
                new Regex(@"E%.{5,34}"), 
               }); 
     myReader.OnDataLoaded += FillControls;