【C13】PPT转图片

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 IdcardValidate
{
    private const String url = "https://api.docsdk.com/v3/convert";
    private const String method = "POST";
    private const String apiKey = "九云图分配的apiKey";
    private const String apiSecret = "九云图分配的apiSecret";

    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(apiKey + apiSecret + timestamp);
        String format = "image-array"; //输出格式：png或jpg。
        String document = ""; //PPT文件的URL或BASE64编码。
        String bodys = "apiKey=" + apiKey + "&sign=" + sign + "&timestamp=" + timestamp + "&format=" + format + "&document=" + document;

        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";

        byte[] data = Encoding.UTF8.GetBytes(bodys);
        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();
    }
}