在使用腾讯云对象存储之前，该公司一直在使用传统的FTP上传模式。随着用户数量的增加，FTP暴露了越来越多的问题。1.传输效率低，上传速度慢。2.经常上传其他文件来攻击服务器，因此不能保证安全性。因此，经过仔细考虑，我们认为我们应该使用第三方云存储服务。
一开始，南京小程序开发我们选择了腾讯云和阿里云。最后，我们选择了腾讯云。腾讯云在文件上传时表现出色，文件越大，性能越好；在下载时比阿里云略胜一筹；文件删除的整体速度稍慢，但是在删除不同大小的文件时相对稳定。当然，这与我们在开发微信小程序中的主要用途密切相关。
除了直接使用API接口外，cos还为我们的coolkey多个applet使用腾讯云对象存储时提供了多种SDK供我们使用。但是，在cos提供的SDK中找不到与asp.net相关的SDK。
南京小程序开发在一番百度和一顿操作终于让我找到啦！看到？我只能说它真的很深，并且是历史版本。但是无论如何，南京小程序开发我们找到了
找到Cා的SDK并下载（附加Cා版本SDK的下载地址和CාSDK GitHub项目的下载地址），然后按照SDK中提供的方法成功上传！
但是，它并不是那么简单。当我们使用SDK中的方法时，我们发现SDK中的方法仅适用于具有绝对路径地址的文件上传！也就是说，仅使用文件域上载ASP中的文件是不够的。净。这时，我们只需要更改方法！
附加修改后的代码：
/// <summary>
///File stream upload
///Note: cool more applet
///SliceUploadInit SliceUploadData SliceUploadFinihs is used for piecewise upload
/// </summary>
///< param name = "bucketname" > bucket name < / param >
///< param name = "remotepath" > remote file path < / param >
///< param name = "localpath" > local file path < / param >
///< param name = "parameterdic" > parameterdictionary < / param >
/// <returns></returns>
public string UploadFile(string bucketName, string remotePath, Stream file, string filename,Dictionary<string, string> parameterDic = null)
{
if (remotePath.EndsWith("/"))
{
return constructResult(ERRORCode.ERROR_CODE_PARAMETER_ERROE, "file path can not end with '/'");
}
string bizAttribute = "";
if (parameterDic != null && parameterDic.ContainsKey(CosParameters.PARA_BIZ_ATTR))
bizAttribute = parameterDic[CosParameters.PARA_BIZ_ATTR];
int insertOnly = 1;
if (parameterDic != null && parameterDic.ContainsKey(CosParameters.PARA_INSERT_ONLY))
{
try
{
insertOnly = Int32.Parse(parameterDic[CosParameters.PARA_INSERT_ONLY]);
}
catch (Exception e)
{
Console.WriteLine(e.Message);
return constructResult(ERRORCode.ERROR_CODE_PARAMETER_ERROE, "parameter insertOnly value invalidate");
}
}
return Upload(bucketName, remotePath, file, filename, bizAttribute, insertOnly);
}
/// <summary>
///Single file upload
///Note: cool more applet
///< param name = "bucketname" > bucket name < / param >
///< param name = "remotepath" > remote file path < / param >
///< param name = "localpath" > local file path < / param >
///< param name = "biz_attr" > biz_attr attribute < / param >
///< param name = "insertonly" > overwrite files with the same name < / param >
/// <returns></returns>
public string Upload(string bucketName, string remotePath, Stream file,string filename,
string bizAttribute = "", int insertOnly = 1)
{
var url = generateURL(bucketName, remotePath);
var sha1 = SHA1.GetFileSHA1(file);
var data = new Dictionary<string, object>();
data.Add("op", "upload");
data.Add("sha", sha1);
data.Add("biz_attr", bizAttribute);
data.Add("insertOnly", insertOnly);
var expired = getExpiredTime();
var sign = Sign.Signature(appId, secretId, secretKey, expired, bucketName);
var header = new Dictionary<string, string>();
header.Add("Authorization", sign);
return httpRequest.SendRequest(url, ref data, HttpMethod.Post, ref header, timeOut, file, filename);
}
#Region upload file stream directly
public string SendRequest(string url, ref Dictionary<string, object> data, HttpMethod requestMethod,
ref Dictionary<string, string> header, int timeOut, Stream file,string filename, long offset = -1, int sliceSize = 0)
{
try
{
//Console.WriteLine("url:" + url);
System.Net.ServicePointManager.Expect100Continue = false;
if (requestMethod == HttpMethod.Get)
{
var paramStr = "";
foreach (var key in data.Keys)
{
paramStr += string.Format("{0}={1}&", key, HttpUtility.UrlEncode(data[key].ToString()));
}
paramStr = paramStr.TrimEnd('&');
url += (url.EndsWith("?") ? "&" : "?") + paramStr;
}
request = (HttpWebRequest)HttpWebRequest.Create(url);
request.Accept = CosDefaultValue.ACCEPT;
request.KeepAlive = true;
request.UserAgent = CosDefaultValue.USER_AGENT_VERSION;
request.Timeout = timeOut;
foreach (var key in header.Keys)
{
if (key == "Content-Type")
{
request.ContentType = header[key];
}
else
{
request.Headers.Add(key, header[key]);
}
}
if (requestMethod == HttpMethod.Post)
{
request.Method = requestMethod.ToString().ToUpper();
var memStream = new MemoryStream();
if (header.ContainsKey("Content-Type") && header["Content-Type"] == "application/json")
{
var json = JsonConvert.SerializeObject(data);
var jsonByte = Encoding.GetEncoding("utf-8").GetBytes(json.ToString());
memStream.Write(jsonByte, 0, jsonByte.Length);
}
else
{
var boundary = "---------------" + DateTime.Now.Ticks.ToString("x");
var beginBoundary = Encoding.ASCII.GetBytes("\r\n--" + boundary + "\r\n");
var endBoundary = Encoding.ASCII.GetBytes("\r\n--" + boundary + "--\r\n");
request.ContentType = "multipart/form-data; boundary=" + boundary;
var strBuf = new StringBuilder();
foreach (var key in data.Keys)
{
strBuf.Append("\r\n--" + boundary + "\r\n");
strBuf.Append("Content-Disposition: form-data; name=\"" + key + "\"\r\n\r\n");
strBuf.Append(data[key].ToString());
}
var paramsByte = Encoding.GetEncoding("utf-8").GetBytes(strBuf.ToString());
memStream.Write(paramsByte, 0, paramsByte.Length);
memStream.Write(beginBoundary, 0, beginBoundary.Length);
var fileStream = file;
const string filePartHeader =
"Content-Disposition: form-data; name=\"fileContent\"; filename=\"{0}\"\r\n" +
"Content-Type: application/octet-stream\r\n\r\n";
var headerText = string.Format(filePartHeader, filename);
var headerbytes = Encoding.UTF8.GetBytes(headerText);
memStream.Write(headerbytes, 0, headerbytes.Length);
if (offset == -1)
{
var buffer = new byte[1024];
int bytesRead;
while ((bytesRead = fileStream.Read(buffer, 0, buffer.Length)) != 0)
{
memStream.Write(buffer, 0, bytesRead);
}
}
else
{
var buffer = new byte[sliceSize];
int bytesRead;
fileStream.Seek(offset, SeekOrigin.Begin);
bytesRead = fileStream.Read(buffer, 0, buffer.Length);
memStream.Write(buffer, 0, bytesRead);
}
fileStream.Close();
memStream.Write(endBoundary, 0, endBoundary.Length);
}
request.ContentLength = memStream.Length;
var requestStream = request.GetRequestStream();
memStream.Position = 0;
var tempBuffer = new byte[memStream.Length];
memStream.Read(tempBuffer, 0, tempBuffer.Length);
memStream.Close();
requestStream.Write(tempBuffer, 0, tempBuffer.Length);
requestStream.Close();
//Console.WriteLine(strBuf.ToString());
}
//Console.WriteLine(request.ContentType.ToString());
var response = request.GetResponse();
using (var s = response.GetResponseStream())
{
var reader = new StreamReader(s, Encoding.UTF8);
return reader.ReadToEnd();
}
}
catch (WebException we)
{
if (we.Status == WebExceptionStatus.ProtocolError)
{
using (var s = we.Response.GetResponseStream())
{
var reader = new StreamReader(s, Encoding.UTF8);
return reader.ReadToEnd();
}
}
else
{
throw we;
}
}
catch (Exception e)
{
throw e;
}
}
使用上面修改的方法直接输入文件流，并通过文本字段将文件上传到腾讯云！
摘要
以上是
南京小程序开发安优云小编基于腾讯云对象存储推出的微信小程序的图像上传功能。希望对您有所帮助。如果您有任何疑问，请给我留言，小编会及时给您答复。非常感谢您对我们网站的支持！
