将Base64字符串转换为图像并保存

时间:2017-07-27 20:47:37

标签: c# image base64

我想将base64图像保存到应用程序中的文件夹,但我的代码有问题。它给出了如下错误,

  

Message =" Base-64字符数组或字符串的长度无效。"

在我的代码中;

public static string UpdateUser(int refuser, string name, string surname,string base64)
        {
            string result = "FAILED";
            var photo = "";

            if (base64!=null && base64!="")
            {


                string mediaPath = Extend.GetXmlConfigParameter("media", "path")+"User\\";
                string mediaName = Guid.NewGuid().ToString();
                base64 = base64.Replace("data:image/png;base64,", "");
                base64 = base64.Replace("data:image/jpg;base64,", "");
                base64 = base64.Replace("data:image/gif;base64,", "");
                base64 = base64.Replace("data:image/jpeg;base64,", "");

                string filePath = mediaPath + mediaName + ".png";
                try
                {
                    byte[] bytes = Convert.FromBase64String(base64);

                    Image image;
                    using (MemoryStream ms = new MemoryStream(bytes))
                    {
                        image = Image.FromStream(ms);
                    }

                    image.Save(filePath, System.Drawing.Imaging.ImageFormat.Png);
                    //File.WriteAllBytes(filePath, Convert.FromBase64String(base64));
                    photo = mediaName + ".png";
                }
                catch(Exception ex)
                {
                    Logger.LogError(ex.Message, ex.StackTrace);
                    return result;
                }
            }
            try
            {
                DataSet ds = Database.GetDataSet(con, Database.CreateSpQuery("mobile_user_update ",
                     new List<object> {
                        refuser,
                        name,
                        surname,
                        photo
                     }));
                if (!Database.IsDataSetValid(ds))
                    return null;
                result = Database.GetString(ds.Tables[0].Rows[0]["Result"]);
            }
            catch (Exception ex)
            {
                Logger.LogError(ex.Message, ex.StackTrace);
            }
            return result;
        }

当我尝试使用代码

中的下一步转换为字节数组时
byte[] bytes = Convert.FromBase64String(base64);

我接受了这个错误。我的示例base64字符串是

  

数据:图像/ PNG; BASE64,iVBORw0KGgoAAAANSUhEUgAAAMEAAAEFCAMAAABtknO4AAABhlBMVEX //// oTD3m5uZMS01PTU8AAADy8vIgICA4OzYPM0egoI7 / zMnoSzza29o2Nzb6 + vpGRUdBQEIwMDGFhYbIycmxsbLp6enoRzfi4uLv7 + / nQzLnRTT0 // + bmYnV1dXxTj6oqJjAwMAXFxfJQTTnPiyzs7P98vGzOi + 9uq7 / 0 / mIwvW8 / T73tw6OjovLS / ZRzndzMl4d3hZWFrmNCIvMy31sKqWlZb / UDsREREAL0dkZGQAITvX5 + B84 + HbRznNzcOko6TpXVDraF0AFjTle3H0r6k2Pkrwj4b2u7Z / F3 / RursAACSsPTPunZftdmspNjbgpJ4jJyHwlIzEYlnRf3lvbG4AITCmt7fhnJbrYVXoGgDszszeeGuSkourqKAVGxGGhntGNzjNTkMMMzajQjqOPzxsQ0ZcNTNpTU06SVSkTEaARUFMRU7etrHV / P1fZHApMkWSgYc0HTFXOURGOkq9lZXFqqlYb3q71NX7rKZQFRYAFS1kdoGBkJkAAB52O0MqVWNlhJCmctyFAAAgAElEQVR4nNVdi3 / a2JVGICAZS0jiISHhEYMtSI0BG5hgm4BXEBzwJDAZdtnG4223nc60TdvspN1tp9mZNLv / + d6Hrl4IELIce0 / m57FB3Hu + ex73nHMfRCJh0eT8aBpaY3dB1wzDKO / umoub0FShKEbauWs2ghM3kigAQenfNSOBCSOgCuO7ZiQwceMCRMBQ / 3 / 16LFCYSFwd81JUNphGCQEqXbXnGxPXKVSiURqA4SAUuZ3zc / WdDCfXc0uKhFsyhRTuGuGNlH / 3Xh + cVAx / 35MKRIjKcP + BBsCpd1zWz6oKoWCommzSR + 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我该如何解决这个问题。

提前致谢。

1 个答案:

答案 0 :(得分:0)

看起来你通过url获得了这个base64字符串。如果是这样,您应该在发送给客户端之前对其进行编码。

 var map = new google.maps.Map(document.getElementById('map_canvas'), {
             center: new google.maps.LatLng(latitudeFirst, longitudeFirst),
             zoom: 12,
             streetViewControl: false,
             mapTypeControl: false
        });