百度接口文字识别的Demo优化版
自从百度官方上线OCR的C#Demo时，我就很兴奋，可是总是出问题——Token！当我们已知Token时，一切都好办了！
下面，我自己的研究成果（懒得处理Json了）：https://download.csdn.net/download/weixin_44856864/12094900
序列号（全部免费）：52pojie.cn
示例序列号（可以使用）：17502-533534-19342-32571-04507-42955-48905-13387-01788-89106-42498-37231-49146-22057-06890-80254-83406-83178-13100
下面献上Demo
原来是这么写的：
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
namespace com.baidu.ai
{
public class General
{
// OCR 通用识别
public static string general()
{
string token = "[调用鉴权接口获取的token]";
string host = "https://aip.baidubce.com/rest/2.0/ocr/v1/general?access_token=" + token;
Encoding encoding = Encoding.Default;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
request.Method = "post";
request.KeepAlive = true;
// 图片的base64编码
string base64 = getFileBase64("[本地图片文件]");
String str = "image=" + HttpUtility.UrlEncode(base64);
byte[] buffer = encoding.GetBytes(str);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
string result = reader.ReadToEnd();
Console.WriteLine("OCR 通用识别:");
Console.WriteLine(result);
return result;
}
public static String getFileBase64(String fileName) {
FileStream filestream = new FileStream(fileName, FileMode.Open);
byte[] arr = new byte[filestream.Length];
filestream.Read(arr, 0, (int)filestream.Length);
string baser64 = Convert.ToBase64String(arr);
filestream.Close();
return baser64;
}
}
}
优化了：
这里需要引用一个名叫“Newtonsoft.Json”的组件，可以使用Nuget进行获取抓包。
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace com.baidu.ai
{
public class General
{
// OCR 通用识别
public static string general(string token,string imageroad,string postdata)
{
try
{
string host = postdata+"?access_token=" + token;
Encoding encoding = Encoding.Default;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
request.Method = "post";
request.KeepAlive = true;
// 图片的base64编码
string base64 = getFileBase64(imageroad);
String str = "image=" + HttpUtility.UrlEncode(base64);
byte[] buffer = encoding.GetBytes(str);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
string result = reader.ReadToEnd();
JObject jo = JObject.Parse(result);
return jo.ToString();
}
catch
{
return "识别错误！"
}
}
public static String getFileBase64(String fileName) {
FileStream filestream = new FileStream(fileName, FileMode.Open);
byte[] arr = new byte[filestream.Length];
filestream.Read(arr, 0, (int)filestream.Length);
string baser64 = Convert.ToBase64String(arr);
filestream.Close();
return baser64;
}
}
}
其中imageroad是路径，token是Access_Token，postdata是请求路径。通用。除了身份证。
身份证：
using System;
using System.IO;
using System.Net;
using System.Text;
using System.Web;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace com.baidu.ai
{
public class General
{
// OCR 通用识别
public static string general(string token,string imageroad,string postdata,string front)
{
try
{
string host = postdata+"?access_token=" + token;
Encoding encoding = Encoding.Default;
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(host);
request.Method = "post";
request.KeepAlive = true;
// 图片的base64编码
string base64 = getFileBase64(imageroad);
String str = "id_card_side=" +front+"image=" + HttpUtility.UrlEncode(base64);
byte[] buffer = encoding.GetBytes(str);
request.ContentLength = buffer.Length;
request.GetRequestStream().Write(buffer, 0, buffer.Length);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.Default);
string result = reader.ReadToEnd();
JObject jo = JObject.Parse(result);
return jo.ToString();
}
catch
{
return "识别错误！"
}
}
public static String getFileBase64(String fileName) {
FileStream filestream = new FileStream(fileName, FileMode.Open);
byte[] arr = new byte[filestream.Length];
filestream.Read(arr, 0, (int)filestream.Length);
string baser64 = Convert.ToBase64String(arr);
filestream.Close();
return baser64;
}
}
}
附：Token的处理方法
官方代码（不可以直接用）
using System;
using System.Collections.Generic;
using System.Net.Http;
namespace com.baidu.ai
{
public static class AccessToken
{
// 调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存
// 返回token示例
public static String TOKEN = "24.adda70c11b9786206253ddb70affdc46.2592000.1493524354.282335-1234567";
// 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
private static String clientId = "百度云应用的AK";
// 百度云中开通对应服务应用的 Secret Key
private static String clientSecret = "百度云应用的SK";
public static String getAccessToken() {
String authHost = "https://aip.baidubce.com/oauth/2.0/token";
HttpClient client = new HttpClient();
List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();
paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
paraList.Add(new KeyValuePair<string, string>("client_id", clientId));
paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));
HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
String result = response.Content.ReadAsStringAsync().Result;
Console.WriteLine(result);
return result;
}
}
}
这里需要引用一个名叫“Newtonsoft.Json”的组件，可以使用Nuget进行获取抓包。
然后的代码是：
using System;
using System.Collections.Generic;
using System.Net.Http;
using Newtonsoft.Json;
using Newtonsoft.Json.Linq;
namespace com.baidu.ai
{
public static class AccessToken
{
// 调用getAccessToken()获取的 access_token建议根据expires_in 时间 设置缓存
// 返回token示例
public static String TOKEN = "24.adda70c11b9786206253ddb70affdc46.2592000.1493524354.282335-1234567";
// 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
private static String clientId = "百度云应用的AK";
// 百度云中开通对应服务应用的 Secret Key
private static String clientSecret = "百度云应用的SK";
public static String getAccessToken() {
String authHost = "https://aip.baidubce.com/oauth/2.0/token";
HttpClient client = new HttpClient();
List<KeyValuePair<String, String>> paraList = new List<KeyValuePair<string, string>>();
paraList.Add(new KeyValuePair<string, string>("grant_type", "client_credentials"));
paraList.Add(new KeyValuePair<string, string>("client_id", clientId));
paraList.Add(new KeyValuePair<string, string>("client_secret", clientSecret));
HttpResponseMessage response = client.PostAsync(authHost, new FormUrlEncodedContent(paraList)).Result;
String result = response.Content.ReadAsStringAsync().Result;
//Console.WriteLine(result);
JObject jo = JObject.Parse(result);
TOKEN = jo.ToString();
return jo.ToString();
}
}
}