ASP.net (c #) code generation code39 Code Generation Method

I have been working on code 128 in the past few days. I have not found any relevant materials. Later, it was impossible to change the code to code39. Write it out and share it with you.

1. First download a free code39 barcode font
2. Create a class named code39 and write the following code
Copy codeThe Code is as follows:
Public sealed class Code39
{
# Region private variables
/// <Summary>
/// The Space Between each of Title, BarCode, BarCodeString
/// </Summary>
Private const int SPACE_HEIGHT = 3;
SizeF _ sizeLabel = SizeF. Empty;
SizeF _ sizeBarCodeValue = SizeF. Empty;
SizeF _ sizeBarCodeString = SizeF. Empty;
# Endregion
# Region Label
Private string _ label = null;
Private Font _ labelFont = null;
/// <Summary>
/// BarCode Title (bar code label)
/// </Summary>
Public string Label
{
Set {_ label = value ;}
}
/// <Summary>
/// BarCode Title Font (Font used for bar code labels)
/// </Summary>
Public Font LabelFont
{
Get
{
If (_ labelFont = null)
Return new Font ("Arial", 10 );
Return _ labelFont;
}
Set {_ labelFont = value ;}
}
# Endregion
Private string _ additionalInfo = null;
Private Font _ addtionalInfoFont = null;
/// <Summary>
/// Additional Info Font (Additional information Font)
/// </Summary>
Public Font AdditionalInfoFont
{
Set {_ addtionalInfoFont = value ;}
Get
{
If (_ addtionalInfoFont = null) return new Font ("Arial", 10 );
Return _ addtionalInfoFont;
}
}
/// <Summary>
/// Additional Info Content, if "ShowBarCodeValue" is true, the info is unvisible
/// Additional information. If ShowBarCodeValue is set to true, this item is not displayed.
/// </Summary>
Public string AdditionalInfo
{
Set {_ additionalInfo = value ;}
}
# Region BarCode Value and Font
Private string _ barCodeValue = null;
/// <Summary>
/// BarCode Value (bar code Value)
/// </Summary>
Public string BarCodeValue
{
Get
{
If (string. IsNullOrEmpty (_ barCodeValue ))
Throw new NullReferenceException ("The BarCodeValue has not been set yet! ");
Return _ barCodeValue;
}
Set {_ barCodeValue = value. StartsWith ("*") & value. EndsWith ("*")? Value: "*" + value + "*";}
}
Private bool _ showBarCodeValue = false;
/// <Summary>
/// Whether to show the original string of barcode value bellow the barcode
/// Whether the bar code value is displayed below the bar code. The default value is false.
/// </Summary>
Public bool ShowBarCodeValue
{
Set {_ showBarCodeValue = value ;}
}
Private Font _ barCodeValueFont = null;
/// <Summary>
/// The font of the codestring to show
/// Font of the bar code value displayed below the bar code
/// </Summary>
Public Font BarCodeValueFont
{
Get
{
If (_ barCodeValueFont = null)
Return new Font ("Arial", 10 );
Return _ barCodeValueFont;
}
Set {_ barCodeValueFont = value ;}
}
Private int _ barCodeFontSize = 50;
/// <Summary>
/// The font size of the barcode value to draw
/// The bar code size. The default value is 50.
/// </Summary>
Public int BarCodeFontSzie
{
Set {_ barCodeFontSize = value ;}
}
# Endregion
# Region generate the barcode image
Private Bitmap BlankBackImage
{
Get
{
Int barCodeWidth = 0, barCodeHeight = 0;
Using (Bitmap bmp = new Bitmap (1, 1, PixelFormat. Format32bppArgb ))
{
Using (Graphics g = Graphics. FromImage (bmp ))
{
If (! String. IsNullOrEmpty (_ label ))
{
_ SizeLabel = g. MeasureString (_ label, LabelFont );
BarCodeWidth = (int) _ sizeLabel. Width;
BarCodeHeight = (int) _ sizeLabel. Height + SPACE_HEIGHT;
}
_ SizeBarCodeValue = g. MeasureString (BarCodeValue, new Font ("Free 3 of 9 Extended", _ barCodeFontSize ));
BarCodeWidth = Math. Max (barCodeWidth, (int) _ sizeBarCodeValue. Width );
BarCodeHeight + = (int) _ sizeBarCodeValue. Height;
If (_ showBarCodeValue)
{
_ SizeBarCodeString = g. MeasureString (_ barCodeValue, BarCodeValueFont );
BarCodeWidth = Math. Max (barCodeWidth, (int) _ sizeBarCodeString. Width );
BarCodeHeight + = (int) _ sizeBarCodeString. Height + SPACE_HEIGHT;
}
// Else
//{
// If (! String. IsNullOrEmpty (_ additionalInfo ))
//{
// _ SizeAdditionalInfo = g. MeasureString (_ additionalInfo, AdditionalInfoFont );
// BarCodeWidth = Math. Max (barCodeWidth, (int) _ sizeAdditionalInfo. Width );
// BarCodeHeight + = (int) _ sizeAdditionalInfo. Height + SPACE_HEIGHT;
//}
//}
}
}
Return new Bitmap (barCodeWidth, barCodeHeight, PixelFormat. Format32bppArgb );
}
}
/// <Summary>
/// Draw the barcode value to the blank back image and output it to the browser
/// Draw a WebForm bar code
/// </Summary>
/// <Param name = "ms"> Recommand the "Response. OutputStream" using Response. OutputStream </param>
/// <Param name = "imageFormat"> The Image format to the Browser is output to The Image format in the Browser. GIF is recommended. </param>
Public Bitmap CreateWebForm (Stream MS, ImageFormat imageFormat)
{
Int barCodeWidth, barCodeHeight;
Using (Bitmap bmp = this. BlankBackImage)
{
BarCodeHeight = bmp. Height;
BarCodeWidth = bmp. Width;
Using (Graphics g = Graphics. FromImage (bmp ))
{
G. Clear (Color. White );
G. TextRenderingHint = System. Drawing. Text. TextRenderingHint. ClearTypeGridFit;
G. SmoothingMode = System. Drawing. Drawing2D. SmoothingMode. HighQuality;
Int vPos = 0;
/// Draw Label String
If (! String. IsNullOrEmpty (_ label ))
{
G. DrawString (_ label, LabelFont, new SolidBrush (Color. Black ),
XCenter (int) _ sizeLabel. Width, barCodeWidth), vPos );
VPos + = (int) _ sizeLabel. Height + SPACE_HEIGHT;
}
Else {vPos = SPACE_HEIGHT ;}
/// Draw The Bar Value
G. DrawString (_ barCodeValue, new Font ("Free 3 of 9 Extended", _ barCodeFontSize), new SolidBrush (Color. Black ),
XCenter (int) _ sizeBarCodeValue. Width, barCodeWidth), vPos );
/// Draw the BarValue String
If (_ showBarCodeValue)
{
G. DrawString (_ barCodeValue, BarCodeValueFont, new SolidBrush (Color. Black ),
XCenter (int) _ sizeBarCodeString. Width, barCodeWidth ),
VPos + (int) _ sizeBarCodeValue. Height );
}
// Else
//{
// If (! String. IsNullOrEmpty (_ additionalInfo ))
//{
// G. DrawString (_ additionalInfo, AdditionalInfoFont, new SolidBrush (Color. Black ),
// XCenter (int) _ sizeAdditionalInfo. Width, barCodeWidth ),
// VPos + (int) _ sizeBarCodeValue. Height );
//}
//}
}
Bmp. Save (MS, imageFormat );
Return bmp;
}
}
/// <Summary>
/// Generate a winform bar code
/// </Summary>
/// <Param name = "imageFormat"> image format. GIF is recommended. </param>
/// <Returns> Stream type </returns>
Public Stream CreateWinForm (ImageFormat imageFormat)
{
Int barCodeWidth, barCodeHeight;
Using (Bitmap bmp = this. BlankBackImage)
{
BarCodeHeight = bmp. Height;
BarCodeWidth = bmp. Width;
Using (Graphics g = Graphics. FromImage (bmp ))
{
G. Clear (Color. White );
G. TextRenderingHint = System. Drawing. Text. TextRenderingHint. ClearTypeGridFit;
G. SmoothingMode = System. Drawing. Drawing2D. SmoothingMode. HighQuality;
Int vPos = 0;
/// Draw Label String
If (! String. IsNullOrEmpty (_ label ))
{
G. DrawString (_ label, LabelFont, new SolidBrush (Color. Black ),
XCenter (int) _ sizeLabel. Width, barCodeWidth), vPos );
VPos + = (int) _ sizeLabel. Height + SPACE_HEIGHT;
}
Else {vPos = SPACE_HEIGHT ;}
/// Draw The Bar Value
G. DrawString (_ barCodeValue, new Font ("Free 3 of 9 Extended", _ barCodeFontSize), new SolidBrush (Color. Black ),
XCenter (int) _ sizeBarCodeValue. Width, barCodeWidth), vPos );
/// Draw the BarValue String
If (_ showBarCodeValue)
{
G. DrawString (_ barCodeValue, BarCodeValueFont, new SolidBrush (Color. Black ),
XCenter (int) _ sizeBarCodeString. Width, barCodeWidth ),
VPos + (int) _ sizeBarCodeValue. Height );
}
// Else
//{
//// If (! String. IsNullOrEmpty (_ additionalInfo ))
////{
/// G. DrawString (_ additionalInfo, AdditionalInfoFont, new SolidBrush (Color. Black ),
//// XCenter (int) _ sizeAdditionalInfo. Width, barCodeWidth ),
/// VPos + (int) _ sizeBarCodeValue. Height );
////}
//}
}
Stream MS = new MemoryStream ();
Bmp. Save (MS, imageFormat );
Return MS;
}
}
# Endregion
Private static int XCenter (int subWidth, int globalWidth)
{
Return (globalWidth-subWidth)/2;
}
}

3. If it is a web program, call CreateWebForm. If it is a cs program, use CreateWinForm.
4. Create An aspx file and write the following code
Copy codeThe Code is as follows:
Protected void Page_Load (object sender, EventArgs e)
{
Code39 code39 = new Code39 ();
Code39.BarCodeValue = "LDSO-001 ";
Code39.BarCodeFontSzie = 60;
// Code39.Label = "39 yards, the code value is displayed at the bottom ";
Code39.ShowBarCodeValue = true;
Response. Write (code39.CreateWebForm (Response. OutputStream, System. Drawing. Imaging. ImageFormat. Gif ));
Code39 = null;
}