我想上传从我的手机应用base64编码字符串(这是写在C#)。该字符串表示需要上传到我的服务器的图像,该服务器也是用C#编写的。我的客户端代码如下所示:不正确的编码和解码的C#
Client Side Code
----------------
Dictionary<string, string> parameters = new Dictionary<string, string>();
parameters.Add("username", GetUserName());
parameters.Add("imageBytes", Convert.ToBase64String(this.ImageBytes));
string data = string.Empty;
foreach (string key in parameters.Keys)
{
data += key;
data += "=";
data += parameters[key];
data += "&";
}
data = data.Substring(0, data.Length - 1);
uploadWebRequest = (HttpWebRequest)(ar.AsyncState);
using (Stream postStream = uploadWebRequest.EndGetRequestStream(ar))
{
byte[] byteArray = Encoding.UTF8.GetBytes(data); // I believe this has something to do with it. But I believe this is correct. So I think something needs to be done on the server
postStream.Write(byteArray, 0, byteArray.Length);
postStream.Flush();
postStream.Close();
}
uploadWebRequest.BeginGetResponse(new AsyncCallback(Upload_Completed), uploadWebRequest);
当我在监视窗口打印出来Convert.ToBase64String(this.ImageBytes)
,我收到以下内容:
Encoded Client String
---------------------
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在我的服务器端,我有以下几点:
Server Side Code
----------------
[AcceptVerbs(HttpVerbs.Post)]
public ActionResult AddPicture(string username, string imageBytes)
{
WriteToTempFileForDebugging(imageBytes);
byte[] tempBytes = Convert.FromBase64String(imageBytes);
using (MemoryStream memoryStream = new MemoryStream(tempBytes))
{
memoryStream.Position = 0;
System.Drawing.Image image = System.Drawing.Image.FromStream(memoryStream);
image.Save("C:\\inetpub\\wwwroot\\MySite\\Pictures\\myImage.png");
}
}
当此代码执行时,Image.FromStream(...)行会引发异常。错误说:System.ArgumentException参数无效。因此,我将'imageBytes'字符串打印到一个临时文件。该临时文件的内容与上面编码的字符串完全相同,只有一个例外。编码字符串中的所有空格(“”)已被替换为加号(“+”)。我猜这是一些编码问题。但是,我不知道如何解决它。我不想做一个查找和替换。
如何以正确的方式解决呢?
谢谢!
是的,它的URL参数编码,它会做的是 - 特别'parameters.Add( “imageBytes”,Convert.ToBase64String(this.ImageBytes));'。你发送数据两次?你可以发布而不是GET?这可能会避开编码问题。 – Rup 2012-08-17 15:03:35
是“this.ImageBytes”的一个字节数组?您也可以使用HttpUtility类来解码URL参数(即它会将+转换回“”) – 2012-08-17 15:04:37
@Rup:他正在POST。 POSTS也需要编码。 – SLaks 2012-08-17 15:04:40