生成小程序碼 (errcode: 41030) invalid page hint“Stream.Length”引發了“System.NotSupportedException”類型的異常

   public string GetQrcode(string strToken, string content)
        {
            string strResult = "";
            string url = "https://api.weixin.qq.com/wxa/getwxacodeunlimit?access_token=" + strToken;
            System.Net.WebRequest wRequest = System.Net.WebRequest.Create(url);
            wRequest.Method = "post";
            wRequest.ContentType = "application/x-www-form-urlencoded";
            #region 添加Post 參數
            byte[] data = Encoding.UTF8.GetBytes(content);
            wRequest.ContentLength = data.Length;
            using (Stream reqStream = wRequest.GetRequestStream())
            {
                reqStream.Write(data, 0, data.Length);
                reqStream.Close();
            }
            #endregion

            HttpWebResponse resp = (HttpWebResponse)wRequest.GetResponse();
            Stream stream = resp.GetResponseStream();
            ////獲取響應內容
            //using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            //{
            //    strResult = reader.ReadToEnd();
            //}

            Image img = Image.FromStream(stream);
}

Image img = Image.FromStream(stream);報“Stream.Length”引發了“System.NotSupportedException”類型的異常 原因是stream不是有效的image，可將回調的結果輸出查看是否正確

////獲取響應內容
            //using (StreamReader reader = new StreamReader(stream, Encoding.UTF8))
            //{
            //    strResult = reader.ReadToEnd();
            //}

檢查result准確。

 生成小程序碼 (errcode: 41030) invalid page hint
此方法生成二維碼必須是已經發布的小程序頁面，否則無法正常獲取小程序碼