小编典典

将base 64字符串转换为图像并保存

c#

这是我的代码:

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();
            }
        }
}

最上面的imageUrl声明接受一个Base64图像字符串,我想将其转换为图像。我认为我的代码集仅适用于“
www.mysite.com/test.jpg”等图像,不适用于Base64字符串。有人有建议吗?谢谢!


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2020-05-19

共1个答案

小编典典

这是一个示例,您可以修改该方法以接受字符串参数。然后只需使用 image.Save(…) 保存图像对象。

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;
}

A generic error occurred in GDI+.当字节代表位图时,可能会发生异常。如果发生这种情况,请在处理内存流之前保存映像(同时仍在using语句中)。

2020-05-19