C # how to generate a QR code (including decoding)

C # how to generate a QR code (including decoding)

1. Using System;
2. Using System. Collections. Generic;
3. Using System. ComponentModel;
4. Using System. Data;
5. Using System. Drawing;
6. Using System. Linq;
7. Using System. Text;
8. Using System. Windows. Forms;
10. Using System. Collections;
11. Using com. google. zxing; // download from the Internet
12. Using System. Text. RegularExpressions;
13. Using ByteMatrix = com. google. zxing. common. ByteMatrix;
15. Namespace QR code
16. {
17. Public partial class Form1: Form
18. {
19. Public Form1 ()
20. {
21. InitializeComponent ();
22. }
23. // Generate a barcode
24. Private void button#click (object sender, EventArgs e)
25. {
26. Regex rg = new Regex ("^ [0-9] {13} $ ");
27. If (! Rg. IsMatch (textBox1.Text ))
28. {
29. MessageBox. Show ("this example uses EAN_13 encoding and requires 13 digits ");
30. Return;
31. }
33. Try
34. {
35. MultiFormatWriter mutiWriter = new com. google. zxing. MultiFormatWriter ();
36. ByteMatrix bm = mutiWriter. encode (textBox1.Text, com. google. zxing. BarcodeFormat. EAN_13, 363,150 );
37. Bitmap img = bm. ToBitmap ();
38. PictureBox1.Image = img;
40. // Automatically save the image to the current directory
41. String filename = System. Environment. CurrentDirectory + "\ EAN_13" + DateTime. Now. Ticks. ToString () + ". jpg ";
42. Img. Save (filename, System. Drawing. Imaging. ImageFormat. Jpeg );
43. Label2.Text = "the image has been saved to:" + filename;
44. }
45. Catch (Exception ee)
46. {
47. MessageBox. Show (ee. Message );
48. }
49. }
51. // Generate a QR code
52. Private void button2_Click (object sender, EventArgs e)
53. {
54. Try
55. {
56. MultiFormatWriter mutiWriter = new com. google. zxing. MultiFormatWriter ();
57. ByteMatrix bm = mutiWriter. encode (textBox1.Text, com. google. zxing. BarcodeFormat. QR_CODE, 300,300 );
58. Bitmap img = bm. ToBitmap ();
59. PictureBox1.Image = img;
60. String filename = System. Environment. CurrentDirectory + "\ QR" + DateTime. Now. Ticks. ToString () + ". jpg ";
61. Img. Save (filename, System. Drawing. Imaging. ImageFormat. Jpeg );
62. Label2.Text = "the image has been saved to:" + filename;
64. }
65. Catch (Exception ee)
66. {
67. MessageBox. Show (ee. Message );
68. }
69. }
71. // Generate a QR code with an image
72. Private void button3_Click (object sender, EventArgs e)
73. {
74. Try
75. {
76. MultiFormatWriter mutiWriter = new com. google. zxing. MultiFormatWriter ();
77. Hashtable hint = new Hashtable ();
78. Hint. Add (EncodeHintType. CHARACTER_SET, "UTF-8 ");
79. Hint. Add (EncodeHintType. ERROR_CORRECTION, com. google. zxing. qrcode. decoder. ErrorCorrectionLevel. H );
80. ByteMatrix bm = mutiWriter. encode (textBox1.Text, com. google. zxing. BarcodeFormat. QR_CODE, 300,300, hint );
81. Bitmap img = bm. ToBitmap ();
82. Image middlImg = QRMiddleImg. Image;
83. System. Drawing. Size realSize = mutiWriter. GetEncodeSize (textBox1.Text, com. google. zxing. BarcodeFormat. QR_CODE, 300,300 );
84. // Calculate the size and position of the inserted Image
85. Int middleImgW = Math. Min (int) (realSize. Width/3.5), middlImg. Width );
86. Int middleImgH = Math. Min (int) (realSize. Height/3.5), middlImg. Height );
87. Int middleImgL = (img. Width-middleImgW)/2;
88. Int middleImgT = (img. Height-middleImgH)/2;
90. // Convert img to bmp format. Otherwise, the Graphics object cannot be created later.
91. Bitmap BMP img = new Bitmap (img. Width, img. Height, System. Drawing. Imaging. PixelFormat. Format32bppArgb );
92. Using (Graphics g = Graphics. FromImage (bmp img ))
93. {
94. G. InterpolationMode = System. Drawing. Drawing2D. InterpolationMode. HighQualityBicubic;
95. G. SmoothingMode = System. Drawing. Drawing2D. SmoothingMode. HighQuality;
96. G. CompositingQuality = System. Drawing. Drawing2D. CompositingQuality. HighQuality;
97. G. DrawImage (img, 0, 0 );
98. }
100. // Insert an image into the QR code
101. System. Drawing. Graphics MyGraphic = System. Drawing. Graphics. FromImage (bmp img );
102. // White background
103. MyGraphic. FillRectangle (Brushes. White, middleImgL, middleImgT, middleImgW, middleImgH );
104. MyGraphic. DrawImage (middlImg, middleImgL, middleImgT, middleImgW, middleImgH );
106. PictureBox1.Image = BMP;
108. // Automatically save the image to the current directory
109. String filename = System. Environment. CurrentDirectory + "\ QR" + DateTime. Now. Ticks. ToString () + ". jpg ";
110. Bmp img. Save (filename, System. Drawing. Imaging. ImageFormat. Jpeg );
111. Label2.Text = "the image has been saved to:" + filename;
113. }
114. Catch (Exception ee)
115. {
116. MessageBox. Show (ee. Message );
117. }
118. }
120. String opFilePath = "";
121. // Select the intermediate image to be generated
122. Private void pictureBox2_Click (object sender, EventArgs e)
123. {
124. OpenFileDialog1.Filter = "Image File | *. bmp; *. jpg; *. png; *. ico ";
125. If (openFileDialog1.ShowDialog () = DialogResult. OK)
126. {
127. OpFilePath = openFileDialog1.FileName;
128. Image img = Image. FromFile (opFilePath );
129. QRMiddleImg. Image = img;
130. }
131. }
133. // Select the image to decode
134. Private void button4_Click (object sender, EventArgs e)
135. {
136. OpenFileDialog1.Filter = "Image File | *. bmp; *. jpg; *. png; *. ico ";
137. If (openFileDialog1.ShowDialog () = DialogResult. OK)
138. {
139. OpFilePath = openFileDialog1.FileName;
140. PictureBox2.ImageLocation = opFilePath;
141. }
142. }
144. // Decodes the QR code
145. Private void button5_Click (object sender, EventArgs e)
146. {
147. MultiFormatReader mutiReader = new com. google. zxing. MultiFormatReader ();
148. Bitmap img = (Bitmap) Bitmap. FromFile (opFilePath );
149. If (img = null)
150. Return;
151. LuminanceSource ls = new RGBLuminanceSource (img, img. Width, img. Height );
152. BinaryBitmap bb = new BinaryBitmap (new com. google. zxing. common. HybridBinarizer (ls ));
153. // Note that it must be a Utf-8 code
154. Hashtable hints = new Hashtable ();
155. Hints. Add (EncodeHintType. CHARACTER_SET, "UTF-8 ");
156. Result r = mutiReader. decode (bb, hints );
157. RichTextBox1.Text = r. Text;
158. }
159. }
160. }