基地64字符串转换为图像并保存 [英] converting a base 64 string to an image and saving it

问题描述

下面是我的code：

protected void SaveMyImage_Click(object sender, EventArgs e)
        {
            string imageUrl = Hidden1.Value;
            string saveLocation = Server.MapPath("~/PictureUploads/whatever2.png") ; 


            HttpWebRequest imageRequest = (HttpWebRequest)WebRequest.Create(imageUrl);
            WebResponse imageResponse = imageRequest.GetResponse();

            Stream responseStream = imageResponse.GetResponseStream();

            using (BinaryReader br = new BinaryReader(responseStream))
            {
                imageBytes = br.ReadBytes(500000);
                br.Close();
            }
            responseStream.Close();
            imageResponse.Close();

            FileStream fs = new FileStream(saveLocation, FileMode.Create);
            BinaryWriter bw = new BinaryWriter(fs);
            try
            {
                bw.Write(imageBytes);
            }
            finally
            {
                fs.Close();
                bw.Close();
            }
        }
}

顶部图片网址declartion正在采取的Base64形象字符串中，我想将其转换成图像。我觉得我的设置code的只适用于像www.mysite.com/test.jpg不是一个Base64字符串的图像。任何人有一些建议吗？谢谢！

The top imageUrl declartion is taking in a Base64 image string, and I want to convert it into an image. I think my set of code only works for images like "www.mysite.com/test.jpg" not for a Base64 string. Anybody have some suggestions? Thanks!

推荐答案

下面是一个例子，你可以修改接受一个字符串参数的方法。然后，只需保存.Save（）图像对象。

Here is an example, you can modify the method to accept a string parameter. Then just save the image object with .Save().

    public Image LoadImage()
    {
        //data:image/gif;base64,
        //this image is a single pixel (black)
        byte[] bytes = Convert.FromBase64String("R0lGODlhAQABAIAAAAAAAAAAACH5BAAAAAAALAAAAAABAAEAAAICTAEAOw==");

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

        return image;
    }

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