C# winfrom 写了一个增值税票识别助手,可识别照片、扫描件、电子票、形成电子台帐。

   首先本小工具使用C# winfrom 实现,其中主要是使用了百度智能云OCR文字识别技术,调用期官网接口,很简单,搭配NPOI Execl操作类库,

利用Spire.pdf类库,把pdf格式发票,转换为png图片格式。自动识别图片、pdf格式发票,发票可以用高拍仪、手机拍照、扫面件等都可以识别。

  其他说明:本程序借助百度智能云API作为基础的发票识别技术

  发票识别助手共分5个功能模块,操作相对很简单,第一步点击添加发票按钮,选择要识别的发票信息。注意说明:目前图片格式支持jpgpngbmp,图片的长和宽要求最短边大于10px

最长边小于2048px;图像编码后大小必须小于4M,建议不要超过1M;第二步点击识别发票按钮,系统开始识别发票信息,识别完成后,发票信息会自动生成;

介绍一下关键的代码:

一、获取百度云API token,这个是官方给的,直接拿过来用就可以了。

 1     public static class AccessToken
 2 
 3     {
 4         // 百度云中开通对应服务应用的 API Key 建议开通应用的时候多选服务
 5         private static String clientId = ConfigurationManager.AppSettings.Get("APIKey");
 6         // 百度云中开通对应服务应用的 Secret Key
 7         private static String clientSecret = ConfigurationManager.AppSettings.Get("SecretKey");
 8 
 9         public static String getAccessToken()
10         {
11             String authHost = "https://aip.baidubce.com/oauth/2.0/token";
12             HttpClient client = new HttpClient();
13             List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();
14             paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
15             paraList.Add(new KeyValuePair<string, string>("client_id", clientId));
16             paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));
17 
18             HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
19             String result = response.Content.ReadAsStringAsync().Result;
20             // Console.WriteLine(result);
21 
22             AccessTokenInfo tokenInfo = JsonConvert.DeserializeObject<AccessTokenInfo>(result);
23 
24             return tokenInfo.access_token;
25         }
26     }
27 
28     public class AccessTokenInfo  
29     {
30         public string refresh_token { get; set; }
31         public string expires_in { get; set; }
32         public string session_key  { get; set; }
33         public string access_token { get; set; }
34         public string scope { get; set; }
35         public string session_secret { get; set; }
36     }

 

二、增值税票识别请求过程和参数传递,也是官方给的例子,自己按照需求修改一下就可以了。

 

 1 // 增值税发票识别
 2         public static string vatInvoice(string fileName)
 3         {
 4             string host = "https://aip.baidubce.com/rest/2.0/ocr/v1/vat_invoice?access_token=" + token;
 5             Encoding encoding = Encoding.Default;
 6             System.Net.HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
 7             request.Method = "post";
 8             request.KeepAlive = true;
 9             // 图片的base64编码
10             string base64 = getFileBase64(fileName);
11             String str = "image=" + UrlEncode(base64);
12             byte[] buffer = encoding.GetBytes(str);
13             request.ContentLength = buffer.Length;
14             request.GetRequestStream().Write(buffer, 0, buffer.Length);
15             HttpWebResponse response = (HttpWebResponse)request.GetResponse();
16             StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
17             string result = reader.ReadToEnd();
18             return result;
19         }
20 
21         public static String getFileBase64(String fileName)
22         {
23             FileStream filestream = new FileStream(fileName, FileMode.Open, System.IO.FileAccess.Read, FileShare.ReadWrite);
24             byte[] arr = new byte[filestream.Length];
25             filestream.Read(arr, 0, (int)filestream.Length);
26             string baser64 = Convert.ToBase64String(arr);
27             filestream.Close();
28             return baser64;
29         }
30 
31         public static string UrlEncode(string str)
32         {
33             StringBuilder sb = new StringBuilder();
34             byte[] byStr = System.Text.Encoding.UTF8.GetBytes(str); //默认System.Text.Encoding.Default.GetBytes(str)
35             for (int i = 0; i < byStr.Length; i++)
36             {
37                 sb.Append(@"%" + Convert.ToString(byStr[i], 16));
38             }
39             return (sb.ToString());
40         }

 

 三、这里的部分是把pdf格式的发票,自动转换为png格式,提供出百度云api需要的文件格式。

 1 private ImageList GetImage(string[] files)
 2         {
 3             ImageList list = new ImageList();
 4             for (int i = 0; i < files.Length; i++)
 5             {
 6                 list.Images.Add(files[i], Image.FromFile(files[i]));
 7                 list.ImageSize = new Size(80, 60);
 8             }
 9             return list;
10         }
11 
12         private string[] GetImages()
13         {
14             OpenFileDialog ofd = new OpenFileDialog();
15             ofd.Multiselect = true;//设置 选择多个文件
16             ofd.InitialDirectory = @"C:\images\";//设置初始目录  TODO:改为系统默认我的文档中的图片文件夹
17             ofd.Multiselect = true;
18             //ofd.Filter = "JPG(*.jpg)|*.jpg|JPEG(*.jpeg)|*.jpeg|PNG(*.png)|*.png|GIF(*.gif)|*.gif|所有文件(*.*)|*.*";
19             ofd.Title = "请选择要识别的发票的图片";
20             ofd.Filter = "图片文件(*.jpg *.jpeg *.bmp *.png)|*.jpg;*.jpeg;*.bmp;*.png;*.pdf";
21             if (ofd.ShowDialog() == DialogResult.OK && ofd.FileNames != null)
22             {
23                 string[] files = ofd.FileNames;
24                 //pdf文件转换为png图片文件
25                 string imageName = "";
26                 for (int i = 0; i < files.Length; i++)
27                 {
28                     if (Path.GetExtension(files[i]).ToUpper().Contains(".PDF"))
29                     {
30                         imageName = Path.GetFileNameWithoutExtension(files[i]);
31                         files[i] = Common.ConvertPDF2Image(files[i], imageName, 0, 1, ImageFormat.Png);
32                         errMsg.AppendText(DateTime.Now.ToLongTimeString().ToString() + " 已将" + imageName + ".pdf自动转换为png图片格式\r\n");
33                     }
34                 }
35                 return files;
36             }
37             else
38             {
39                 return null;
40             }
41         }
42 
43         //格式化日期格式
44         public string fmartDate(string date)
45         {
46             date = date.Replace("", "-");
47             date = date.Replace("", "-");
48             date = date.Replace("", "");
49             return date;
50         }

 

 四、获取api返回的数据,输出到dataGridView中。

 1 private void 识别发票ToolStripMenuItem_Click(object sender, EventArgs e)
 2         {
 3             if (this.listView1.Items.Count == 0)
 4             {
 5                 MessageBox.Show("请先选择要识别的发票!", "消息提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
 6                 return;
 7             }
 8             
 9             Common.ShowProcessing("", this, (obj) =>
10             {
11                 //这里采用委托的方式解决线程卡死问题
12                 this.Invoke(new Action(delegate
13                 {
14                     foreach (ListViewItem item in this.listView1.Items)
15                     {
16                         try
17                         {
18                             var invoiceInfo = JsonConvert.DeserializeObject<dynamic>(vatInvoice(item.SubItems[0].Name));
19                             var items = invoiceInfo.words_result;
20                             if (items != null)
21                             {
22                                 //写入数据表格
23                                 int index = this.dataGridView1.Rows.Add();
24                                 this.dataGridView1.Rows[index].Cells[0].Value = items.InvoiceType;
25                                 this.dataGridView1.Rows[index].Cells[1].Value = items.InvoiceCode;
26                                 this.dataGridView1.Rows[index].Cells[2].Value = items.InvoiceNum;
27                                 this.dataGridView1.Rows[index].Cells[3].Value = fmartDate((string)items.InvoiceDate);
28                                 this.dataGridView1.Rows[index].Cells[4].Value = items.SellerName;
29                                 this.dataGridView1.Rows[index].Cells[5].Value = items.SellerRegisterNum;
30                                 this.dataGridView1.Rows[index].Cells[6].Value = items.SellerAddress;
31                                 this.dataGridView1.Rows[index].Cells[7].Value = items.SellerBank;
32                                 this.dataGridView1.Rows[index].Cells[8].Value = Common.NumberToZero((string)items.TotalAmount);
33                                 this.dataGridView1.Rows[index].Cells[9].Value = "0";
34                                 if (Common.IsPropertyExist(items, "CommodityTaxRate"))
35                                 {
36                                     if (!Common.IsNullOrEmpty(items.CommodityTaxRate[0].word))
37                                     {
38                                         this.dataGridView1.Rows[index].Cells[9].Value = Common.NumberToZero((string)items.CommodityTaxRate[0].word.ToString().Replace("%", ""));
39                                     }
40                                 }
41                                 this.dataGridView1.Rows[index].Cells[10].Value = Common.NumberToZero((string)items.TotalTax);
42                                 this.dataGridView1.Rows[index].Cells[11].Value = items.AmountInFiguers;
43                                 this.dataGridView1.Rows[index].Cells[12].Value = items.InvoiceType.ToString().Contains("电子") ? "" : "";
44                                 this.dataGridView1.Rows[index].Cells[13].Value = items.PurchaserName;
45                                 this.dataGridView1.Rows[index].Cells[14].Value = "一般计税";
46                                 Application.DoEvents();
47                                 addMessage(item.SubItems[0].Text + " 识别完成!");
48                             }
49                             else
50                             {
51                                 if (invoiceInfo.error_code != null)
52                                 {
53                                     addMessage(item.SubItems[0].Text + " -->" + apiErrorMessage((string)invoiceInfo.error_code));
54                                 }
55                             }
56                         }
57                         catch (Exception err)
58                         {
59                             addMessage(item.SubItems[0].Text + err.Message + " 识别出错,已跳过!");
60                         }
61                     }
62                 }));
63                 //这里写处理耗时的代码,代码处理完成则自动关闭该窗口
64             }, null);
65            
66         }

 

五、导出发票明细到EXECL表格中。

  1 private void 导出发票信息ToolStripMenuItem_Click(object sender, EventArgs e)
  2         {
  3             if (this.dataGridView1.Rows.Count == 0)
  4             {
  5                 MessageBox.Show("发票列表信息为空,不能执行导出!", "消息提示", MessageBoxButtons.OKCancel, MessageBoxIcon.Exclamation);
  6                 return;
  7             }
  8 
  9             string fileName = "";
 10             SaveFileDialog sfd = new SaveFileDialog();
 11             sfd.Filter = "导出发票Excel(*.xls)|*.xls";
 12             sfd.FileName = "发票明细 - " + DateTime.Now.ToString("yyyyMMddHHmmss");
 13             if (sfd.ShowDialog() == DialogResult.OK)
 14             {
 15                 Common.ShowProcessing("正在导出,请稍候...", this, (obj) =>
 16                 {
 17                     fileName = sfd.FileName;
 18                     HSSFWorkbook wb = new HSSFWorkbook();
 19                     ISheet sheet = wb.CreateSheet("sheet1");
 20                     int columnCount = dataGridView1.ColumnCount;  //列数
 21                     int rowCount = dataGridView1.Rows.Count;      //行数
 22                     for (int i = 0; i < columnCount; i++)
 23                     {
 24                         sheet.SetColumnWidth(i, 15 * 256);
 25                     }
 26                     //报表标题
 27                     IRow row = sheet.CreateRow(0);
 28                     row.HeightInPoints = 25;
 29                     ICell cell = row.CreateCell(0);
 30                     cell.SetCellValue("发票信息台账");
 31 
 32                     ICellStyle style = wb.CreateCellStyle();
 33 
 34                     style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
 35                     style.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
 36 
 37                     style.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
 38                     style.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
 39                     style.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
 40                     style.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
 41                     style.FillBackgroundColor = HSSFColor.Black.Index;
 42                     style.FillForegroundColor = HSSFColor.White.Index;
 43 
 44                     IFont font = wb.CreateFont();
 45                     font.FontName = "微软雅黑";
 46                     font.FontHeightInPoints = 12;
 47                     font.Boldweight = 700;
 48                     style.SetFont(font);//将新的样式赋给单元格
 49                     cell.CellStyle = style;
 50                     sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, columnCount - 1));
 51 
 52                     //表头
 53                     IRow row1 = sheet.CreateRow(1);
 54                     row1.HeightInPoints = 20;
 55 
 56                     ICellStyle styleHead = wb.CreateCellStyle();
 57                     styleHead.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
 58                     styleHead.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
 59                     styleHead.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
 60                     styleHead.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
 61                     styleHead.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
 62                     styleHead.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
 63                     styleHead.FillBackgroundColor = HSSFColor.Black.Index;
 64                     styleHead.FillForegroundColor = HSSFColor.White.Index;
 65 
 66                     IFont font2 = wb.CreateFont();
 67                     font2.FontName = "微软雅黑";
 68                     font2.FontHeightInPoints = 10;
 69                     font2.Boldweight = 500;
 70                     styleHead.SetFont(font2);//将新的样式赋给单元格
 71 
 72                     for (int i = 0; i < columnCount; i++)
 73                     {
 74                         ICell row1cell = row1.CreateCell(i);
 75                         row1cell.SetCellValue(dataGridView1.Columns[i].HeaderText.ToString());
 76                         row1cell.CellStyle = styleHead;
 77                     }
 78 
 79                     //明细行,从第三列开始
 80                     int rowindex = 2;
 81                     ICellStyle styleBody = wb.CreateCellStyle();
 82                     styleBody.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Left;
 83                     styleBody.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.Center;
 84                     styleBody.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
 85                     styleBody.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
 86                     styleBody.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
 87                     styleBody.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
 88                     styleBody.FillBackgroundColor = HSSFColor.Black.Index;
 89                     styleBody.FillForegroundColor = HSSFColor.White.Index;
 90 
 91                     IFont font3 = wb.CreateFont();
 92                     font3.FontName = "微软雅黑";
 93                     font3.FontHeightInPoints = 9;
 94                     font3.Boldweight = 500;
 95                     styleBody.SetFont(font3);//将新的样式赋给单元格
 96                     for (int i = 0; i < rowCount; i++)
 97                     {
 98                         IRow datarow = sheet.CreateRow(rowindex);
 99                         datarow.Height = 300;
100                         for (int j = 0; j < columnCount; j++)
101                         {
102                             ICell datacell_0 = datarow.CreateCell(j);
103                             datacell_0.SetCellValue(this.dataGridView1.Rows[i].Cells[j].Value.ToString());
104                             datacell_0.CellStyle = styleBody;
105                         }
106                         rowindex += 1;
107                     }
108                     // 转为字节数组
109                     MemoryStream stream = new MemoryStream();
110                     wb.Write(stream);
111                     var buf = stream.ToArray();
112 
113                     //保存为Excel文件  
114                     using (FileStream fs = new FileStream(fileName, FileMode.Create, FileAccess.Write))
115                     {
116                         fs.Write(buf, 0, buf.Length);
117                         fs.Flush();
118                         MessageBox.Show("导出 EXECL 成功!", "消息提示");
119                         addMessage("导出发票信息到Execl表完成!");
120                     }
121                 }, null);
122             }
123         }

 

 操作说明如下:

 

posted @ 2020-11-05 15:51  一壶茶水  阅读(1934)  评论(9编辑  收藏  举报