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前些天,12306这个网站挺火的,看到网上出现了各种各样的登陆、订票插件跟程序。虽然没经历过春运,看到网上各种各样的插件跟工具挺有意思的,下载了几个看了看,都挺不错的。印象中有个java版本的订票程序里面有个验证码识别功能,用tesseract-ocr来识别验证码的,如果验证码不是很复杂识别效果还可以。
开发环境 vs2008
开发语言C#
使用方法很简单
1.下载tesseract 的.net 类库tessnet2_32.dll ,添加引用。 http://www.pixel-technology.com/freeware/tessnet2/
2.下载tesseract 相对应的语言包。 http://code.google.com/p/tesseract-ocr/downloads/list
3.调用tesseract 的方法进行识别。
具体代码
1.读取网上的验证码到pictureBox中//string url = "https://dynamic.12306.cn/otsweb/passCodeAction.do?rand=lrand";-
- string url =
- "http://static.baixing.net/pages/mobile.php?c=bcqsFelX%2bvKQcrnIbhyDYQ%3d%3d/2.jpg";
-
- HttpWebRequest request = WebRequest.Create(url) as
- HttpWebRequest;
-
- HttpWebResponse response =
- request.GetResponse() as HttpWebResponse;
- System.IO.Stream
- responseStream = response.GetResponseStream();
-
- this.pictureBox1.Image = Image.FromStream(responseStream);
- 2.OCR类
-
- public class Ocr
- {
- public void
- DumpResult(List<tessnet2.Word> result)
- {
-
- foreach (tessnet2.Word word in result)
-
- //Console.WriteLine("{0} : {1}", word.Confidence, word.Text);
-
- MessageBox.Show(string.Format("{0} : {1}", word.Confidence,
- word.Text));
- }
- public
- List<tessnet2.Word> DoOCRNormal(Bitmap image, string lang)
-
- {
- tessnet2.Tesseract ocr = new tessnet2.Tesseract();
-
- ocr.Init(null, lang, false);
-
- List<tessnet2.Word> result = ocr.DoOCR(image, Rectangle.Empty);
-
- DumpResult(result);
- return result;
-
- }
- System.Threading.ManualResetEvent m_event;
-
- public void DoOCRMultiThred(Bitmap image, string lang)
-
- {
- tessnet2.Tesseract ocr = new tessnet2.Tesseract();
-
- ocr.Init(null, lang, false);
- // If the OcrDone
- delegate is not null then this'll be the multithreaded version
-
- ocr.OcrDone = new tessnet2.Tesseract.OcrDoneHandler(Finished);
-
- // For event to work, must use the multithreaded version
-
- ocr.ProgressEvent += new
- tessnet2.Tesseract.ProgressHandler(ocr_ProgressEvent);
-
- m_event = new ManualResetEvent(false);
- ocr.DoOCR(image,
- Rectangle.Empty);
- // Wait here it's finished
-
- m_event.WaitOne();
- }
- public void
- Finished(List<tessnet2.Word> result)
- {
-
- DumpResult(result);
- m_event.Set();
-
- }
- void ocr_ProgressEvent(int percent)
-
- {
- Console.WriteLine("{0}% progression", percent);
-
- }
- }
- 3.调用ocr类的方法识别验证码
-
- Ocr ocr = new Ocr();
- //using (Bitmap bmp = new
- Bitmap(@"D:\temp\ocr\b1.bmp"))
- using (Bitmap bmp = new
- Bitmap(this.pictureBox1.Image))
- {
-
- tessnet2.Tesseract tessocr = new tessnet2.Tesseract();
-
- tessocr.SetVariable("tessedit_char_whitelist",
- "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ");
- tessocr.Init(null,
- "eng", false);
- tessocr.GetThresholdedImage(bmp,
- Rectangle.Empty).Save(System.Environment.GetEnvironmentVariable("TEMP") + "\" +
- Guid.NewGuid().ToString() + ".bmp");
- // Tessdata directory
- must be in the directory than this exe
-
- //Console.WriteLine("Multithread version");
-
- //ocr.DoOCRMultiThred(bmp, "eng");
-
- //Console.WriteLine("Normal version");
-
-
-
- ocr.DoOCRNormal(bmp, "eng");
- }
复制代码 不足之处,如果验证码比较复杂,识别效果不太好,为了提高验证率,可以自己进行训练。具体可参考 http://code.google.com/p/tesseract-ocr/
如果你发现有什么不合理的,需要改进的地方,或者你有什么更好的实现方法邮件联系328452421@qq.com(qq常年不在线,邮件联系) 朱晓 。相互交流 谢谢
源码下载地址 http://download.csdn.net/detail/xiaoxiao108/4041404
作者:xiaoxiao108 发表于2012-2-2 17:03:37 原文链接
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