行驶证 OCR 识别 API 接口用C#如何调用

具体来说，行驶证 OCR 识别接口具备强大的功能，可以准确识别包括所有人、品牌型号、住址、车牌号、发动机号码、车辆识别代号、注册日期、发证日期等多个至关重要的字段信息。在实际应用中，该接口通过对行驶证照片进行全面而深入的智能分析，能够极为精准地提取出上述的这些信息。并且，它会将提取出的信息高效地转化为可编辑、可存储的文本格式，为用户后续的操作和管理提供了极大的便利。

以下是行驶证 OCR 识别 API 接口用C#如何调用的示例代码：

                                                      
using System;
using System.IO;
using System.Net;
using System.Net.Security;
using System.Security.Cryptography;
using System.Security.Cryptography.X509Certificates;
using System.Text;

public class ApiDemo {
    private const String url = "https://api.shuxuntech.com/v1/vehicle/ocr";
    private const String method = "POST";
    private const String appKey = "您的appKey";
    private const String appSecret = "您的appSecret";

    public static void Main(string[] args) {
        TimeSpan ts = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0);
        String timestamp = Convert.ToInt64(ts.TotalMilliseconds).ToString();
        String sign = SHA256(appKey + timestamp + appSecret);

        HttpWebRequest httpRequest = null;
        HttpWebResponse httpResponse = null;

        httpRequest = (HttpWebRequest) WebRequest.CreateDefault(new Uri(url));
        httpRequest.Method = method;
        httpRequest.ContentType = "application/x-www-form-urlencoded; charset=UTF-8";

        httpRequest.Headers.Add("appKey", appKey);
        httpRequest.Headers.Add("timestamp", timestamp);
        httpRequest.Headers.Add("sign", sign);

        String image = "";
        String imgUrl = "";
        String params = "image=" + image + "&imgUrl=" + imgUrl;

        byte[] data = Encoding.UTF8.GetBytes(params);
        using (Stream stream = httpRequest.GetRequestStream()) {
            stream.Write(data, 0, data.Length);
        }

        httpResponse = (HttpWebResponse) httpRequest.GetResponse();
        Console.WriteLine(httpResponse.StatusCode);
        Stream st = httpResponse.GetResponseStream();
        StreamReader reader = new StreamReader(st, Encoding.GetEncoding("utf-8"));
        Console.WriteLine(reader.ReadToEnd());
    }

    public static string SHA256(string str) {
        byte[] SHA256Data = Encoding.UTF8.GetBytes(str);
        SHA256Managed Sha256 = new SHA256Managed();
        byte[] by = Sha256.ComputeHash(SHA256Data);
        return BitConverter.ToString(by).Replace("-", "").ToLower();
    }
}

返回的数据：

（1）正确返回

{
    "code": "0",
    "msg": "成功",
    "isFee": 1,
    "seqNo": "q7q3znh36dl0fxugefouneng076l1kpg",
    "data": {
        "result": 1,
        "resultDesc": "识别成功，有数据",
        "info": {
            "owner": "杭州优行料技有限公司宿迁分公司",
            "issuedBy": "江苏省宿迁市公安局交通警察支队",
            "side": "front",
            "address": "沭阳县蓝天名城19幢A1906室",
            "vehicleType": "小型轿车",
            "registerDate": "2016-12-28",
            "type": 3,
            "engineNo": "GB5002243",
            "issueDate": "2020-03-27",
            "plateNo": "苏HD0083",
            "useCharacter": "非营运",
            "model": "吉利羡日牌MR7002BEV03",
            "vin": "L6T78Y4Y3G680672"
        }
    }
}

（2）错误返回

{
    "code": "1",
    "msg": "参数错误",
    "isFee": 0,
    "seqNo": null,
    "data": null
}

需要特别注意的是，在使用行驶证 OCR 识别 API 之前，我们首先需要申请并获取 API Key,不同的平台获取 API Key 的方式可能会有所不同。但是这个 API Key 将作为我们身份验证的凭证，在后续的接口请求中必须携带。