利用百度接口，识别身份证

http://apistore.baidu.com/apiworks/servicedetail/146.html

 protected void Button1_Click(object sender, EventArgs e)
        {

            Stream fstream = FileUpload1.PostedFile.InputStream;
            byte[] img = new byte[fstream.Length];
            fstream.Read(img, 0, img.Length);
            fstream.Close();
            string imgdata = Convert.ToBase64String(img);
            
            string url = "http://apis.baidu.com/apistore/idlocr/ocr";
            string param = "fromdevice=pc&clientip=10.10.10.0&detecttype=LocateRecognize&languagetype=CHN_ENG&imagetype=1&image="+imgdata;
            string result = request(url,param);
            ss.Text = result;

        }


/// <summary>
/// 发送HTTP请求
/// </summary>
/// <param name="url">请求的URL</param>
/// <param name="param">请求的参数</param>
/// <returns>请求结果</returns>
public static string request(string url, string param)
{
    string strURL = url;
    System.Net.HttpWebRequest request;
    request = (System.Net.HttpWebRequest)WebRequest.Create(strURL);
    request.Method = "POST";
    // 添加header
    request.Headers.Add("apikey", "e0bbb1655505bcb36a6581a5b632207a");
    request.ContentType = "application/x-www-form-urlencoded";
    string paraUrlCoded = param;
    byte[] payload;
    payload = System.Text.Encoding.UTF8.GetBytes(paraUrlCoded);
    request.ContentLength = payload.Length;
    Stream writer = request.GetRequestStream();
    writer.Write(payload, 0, payload.Length);
    writer.Close();
    System.Net.HttpWebResponse response;
    response = (System.Net.HttpWebResponse)request.GetResponse();
    System.IO.Stream s;
    s = response.GetResponseStream();
    string StrDate = "";
    string strValue = "";
    StreamReader Reader = new StreamReader(s, Encoding.UTF8);
    while ((StrDate = Reader.ReadLine()) != null)
    {
        strValue += StrDate + "<br>";
    }
    return strValue;
}