C # create a barcode

// Codeusing System; using System. collections. generic; using System. componentModel; using System. data; using System. drawing; using System. drawing. imaging; using System. linq; using System. text; using System. threading. tasks; using System. windows. forms; using System. IO; namespace WindowsFormsApplication1 {public partial class Form1: Form {public Form1 () {InitializeComponent () ;} Bitmap B; private void Form1_Lo Ad (object sender, EventArgs e) // generate the QR code {} // <summary> // code39 code encoding scheme based on the string. The Width Adjustment Method is specific. The algorithm of code39 code is not studied, in short, the algorithms for each encoding scheme are different. // </summary> /// <param name = "strSource"> </param> /// <returns> </returns> private bitmap GetCode39 (string strSource) {int x = 5; int y = 0; int WidLength = 2; int NarrowLength = 1; int BarCodeHeight = 50; // The height of the barcode int intSourceLength = strSource. length; string strEncode = "010010" 100 "; string AlphaBet =" 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ -. $/+ % * "; // Code39 letter string [] Code39 = {/** // * 0 */" 000110100 ", /** // * 1 */"100100001",/** // * 2 */"001100001",/** // * 3 */"101100000 ", /** // * 4 */"000110001",/** // * 5 */"100110000",/** // * 6 */"001110000 ", /** // * 7 */"000100101",/** // * 8 */"100100100",/** // * 9 */"001100100 ", /** // * A */"100001001",/** // * B */"00100100 1 ",/** // * C */" 101001000 ",/** // * D */" 000011001 ", /** // * E */"100011000",/** // * F */"001011000",/** // * G */"000001101 ", /** // * H */"100001100",/** // * I */"001001100",/** // * J */"000011100 ", /** // * K */"100000011",/** // * L */"001000011",/** // * M */"101000010 ", /** // * N */"000010011",/** // * O */"100010010",/** // * P */"001010010 ", /** // * Q */"000000111",/** // * R */"10000011 0 ",/** // * S */" 001000110 ",/** // * T */" 000010110 ", /** // * U */"110000001",/** // * V */"011000001",/** // * W */"111000000 ", /** // ** X */"010010001",/** // * Y */"110010000",/** // * Z */"011010000 ", /** // *-*/"010000101 ",/**//*. */"110000100",/** // * ''' */"011000100",/** // * $*/"010101000 ", /** // */"010100010",/**/* + */"010001010",/**/* % */"000101010 ", /** // ***/"01001010 0 "}; strSource = strSource. toUpper (); // all input characters are converted into uppercase Bitmap objBitmap = new Bitmap (WidLength * 3 + NarrowLength * 7) * (intSourceLength + 2 )) + (x * 2), BarCodeHeight + (y * 2); // specify the width and height of Graphics objGraphics = Graphics. fromImage (objBitmap); objGraphics. fillRectangle (Brushes. white, 0, 0, objBitmap. width, objBitmap. height); for (int I = 0; I <intSourceLength; I ++) {if (AlphaBet. indexOf (strSou Rce [I]) =-1 | strSource [I] = '*') {objGraphics. drawString ("contains invalid characters", SystemFonts. defaultFont, Brushes. red, x, y); return objBitmap;} strEncode = string. format ("{0} 0 {1}", strEncode, Code39 [AlphaBet. indexOf (strSource [I]);} strEncode = string. format ("{0} 0010010100", strEncode); int intEncodeLength = strEncode. length; int intBarWidth; // The width of the barcode for (int I = 0; I <intEncodeLength; I ++) {intBarW Idth = strEncode [I] = '1 '? WidLength: NarrowLength; objGraphics. FillRectangle (I % 2 = 0? Brushes. black: Brushes. white, x, y, intBarWidth, BarCodeHeight); // x + = intBarWidth;} return objBitmap;} private void textBox1_KeyPress (object sender, KeyPressEventArgs e) {if (e. keyChar = 13) {B = GetCode39 (this. textBox1.Text); this. pictureBox1.Image = B ;}} private void btnSave_Click (object sender, EventArgs e) {SaveFileDialog savefiledialog = new SaveFileDialog (); savefiledialog. filter = "image format (*. jpg) | *. jpg "; savefiledialog. title = "Save image"; savefiledialog. fileName = this. textBox1.Text; if (savefiledialog. showDialog () = DialogResult. OK) {B. save (savefiledialog. fileName, ImageFormat. jpeg );}}}}