在本文中,我們將使用ASP.NET web services創建條形碼。我們還將創建含有條形碼的Windows Forms和Console應用程序。該過程會用到Aspose.BarCode這個控件。

這樣做有什么好處呢？

Web services的主要優勢在于軟件與外部應用程序集成。標準化的請求/響應模型,任何基于XML web service的客戶端應用程序都可以從中受益。以下是簡短的條形碼服務的表現形式。客戶端不需要在此安裝Aspose.BarCode for .NET。他們只需發送兩個字符串值(代碼電文和符號)，就將從服務端獲取條形碼(字節數組)。

打開Microsoft Visual Studio，并創建一個“ASP.NET Web Service Application”新項目，命名為“BarCodeService”。 添加以下引用。                                              

1.“Add Reference”對話框的System.Drawing from .NET選項卡

2. Aspose.BarCode。

找到 Aspose.BarCode for .NET安裝的位置并選擇。Visual Studio會添加了一個默認的類“Service1“到Service1.asmx文檔的Web Service項目。 打開它,并為這個類添加以下方法。

[C#]

[WebMethod]
public byte[] GetBarcode(string strCodetext, string strSymbology)
{
    // Initialize BarCodeBuilder
    BarCodeBuilder builder = new BarCodeBuilder();
    // Set codetext
    builder.CodeText = strCodetext;
    // Set barcode symbology
    builder.SymbologyType = (Symbology) Enum.Parse(typeof(Symbology), strSymbology, true);

    // Create and save the barcode image to memory stream
    MemoryStream imgStream = new MemoryStream();
    builder.Save(imgStream, ImageFormat.Png);

    // Return the barcode image as a byte array
    return imgStream.ToArray();
}
 

[VB.NET]

<WebMethod> _
Public Function GetBarcode(ByVal strCodetext As String, ByVal strSymbology As String) As Byte()
    ' Initialize BarCodeBuilder
    Dim builder As BarCodeBuilder = New BarCodeBuilder()
    ' Set codetext
    builder.CodeText = strCodetext
    ' Set barcode symbology
    builder.SymbologyType = CType(System.Enum.Parse(GetType(Symbology), strSymbology, True), Symbology)

    ' Create and save the barcode image to memory stream
    Dim imgStream As MemoryStream = New MemoryStream()
    builder.Save(imgStream, ImageFormat.Png)

    ' Return the barcode image as a byte array
    Return imgStream.ToArray()
End Function
 

web方法需要客戶端以下兩個參數:

1.Codetext

2.Symbology

這些參數為String字符串類型。這些參數被傳遞到BarCodeBuilder類,然后創建條形碼，并以字節數組的形式給客戶端發送條形碼。

使用Windows Forms應用中的Web Service

打開Visual Studio，并創建一個新類型“Windows Application”的項目。命名項目為“GetBarCodeWinForms”。通過右鍵單擊“References”，選擇,然后從菜單中選擇““Add Service Reference”為web service添加引用。鍵入web service的地址。在得到正確的結果之后,在Namespace命名域中輸入“BarCodeService”，點擊“Ok”按鈕以添加引用。

設計形式如下圖所示：

它包含以下控件:

1.Textbox:輸入代碼

2.Combobox:輸入符號類型

3.Button:調用web service

4.Picturebox:顯示條形碼

為代碼的按鈕單擊事件添加以下代碼。

[C#]

// Initialize the Barcode Web Service
BarCodeService.Service1SoapClient barcodeService = new BarCodeService.Service1SoapClient();
// Call the GetBarcode web method
// Pass codetext and symbology in parameters
// Get the barcode image returned from the web method in the form of byte array
byte[] arrBarcodeImage = barcodeService.GetBarcode(txtCodetext.Text, cmbSymbology.Text);

// Create an instance of Image from the byte array
MemoryStream imgStream = new MemoryStream(arrBarcodeImage);
Image imgBarcode = Bitmap.FromStream(imgStream);

// Assign the barcode image to the Picturebox control
picBarcodeImage.Image = imgBarcode;
picBarcodeImage.Height = imgBarcode.Height;
picBarcodeImage.Width = imgBarcode.Width;
 

[VB.NET]

' Initialize the Barcode Web Service
Dim barcodeService As BarCodeService.Service1SoapClient = New BarCodeService.Service1SoapClient()
' Call the GetBarcode web method
' Pass codetext and symbology in parameters
' Get the barcode image returned from the web method in the form of byte array
Dim arrBarcodeImage As Byte() = barcodeService.GetBarcode(txtCodetext.Text, cmbSymbology.Text)

' Create an instance of Image from the byte array
Dim imgStream As MemoryStream = New MemoryStream(arrBarcodeImage)
Dim imgBarcode As Image = Bitmap.FromStream(imgStream)

' Assign the barcode image to the Picturebox control
picBarcodeImage.Image = imgBarcode
picBarcodeImage.Height = imgBarcode.Height
picBarcodeImage.Width = imgBarcode.Width

運行該應用程序,指定某些值,點擊“Get Barcode”按鈕。應用程序將使用條形碼web service，并從中獲取條形碼。條形碼將顯示在如下窗體中。

從Console Application控制臺應用程序使用Web Service

在Visual Studio中創建一個“Console Application”新項目,將項目命名為“GetBarCodeConsole”。 將該引用添加到條碼服務中,方法和winforms應用程序中的相同。在main()方法中編寫以下代碼。

[C#]

try
{
    // Initialize the Barcode Web Service
    BarCodeService.Service1SoapClient c = new GetBarCodeConsole.BarCodeService.Service1SoapClient();
    // Call the GetBarcode web method
    // Pass codetext and symbology in parameters
    // Get the barcode image returned from the web method in the form of byte array
    byte[] arrBarcodeImage = c.GetBarcode("console application", "pdf417");

    // Save the byte array (barcode image) to disk
    FileStream imgWriter = new FileStream("barcode.png", FileMode.Create);
    imgWriter.Write(arrBarcodeImage, 0, arrBarcodeImage.Length);
    imgWriter.Close();

    // Open the barcode image
    Process.Start("barcode.png");
}
catch (Exception ex)
{
    Console.WriteLine(ex.Message);
}

Console.WriteLine("Press any key to exit....");
Console.ReadKey();
 

[VB.NET]

Try
    ' Initialize the Barcode Web Service
    Dim c As BarCodeService.Service1SoapClient = New GetBarCodeConsole.BarCodeService.Service1SoapClient()
    ' Call the GetBarcode web method
    ' Pass codetext and symbology in parameters
    ' Get the barcode image returned from the web method in the form of byte array
    Dim arrBarcodeImage As Byte() = c.GetBarcode("console application", "pdf417")

    ' Save the byte array (barcode image) to disk
    Dim imgWriter As FileStream = New FileStream("barcode.png", FileMode.Create)
    imgWriter.Write(arrBarcodeImage, 0, arrBarcodeImage.Length)
    imgWriter.Close()

    ' Open the barcode image
    Process.Start("barcode.png")
Catch ex As Exception
    Console.WriteLine(ex.Message)
End Try

Console.WriteLine("Press any key to exit....")
Console.ReadKey() 

運行該應用程序,它將使用條形碼web service,得到條形碼，并保存在本地磁盤上。