【移动应用开发技术】.Net开发微信公众平台之处理图片的示例分析

【移动应用开发技术】.Net开发微信公众平台之处理图片的示例分析

///

<summary>

///

下载保存多媒体文件,返回多媒体保存路径

///

</summary>

///

<param

name="ACCESS_TOKEN"></param>

///

<param

name="MEDIA_ID"></param>

///

<returns></returns>

public

string

GetMultimedia(string

ACCESS_TOKEN,

string

MEDIA_ID)

{

string

file

=

string.Empty;

string

content

=

string.Empty;

string

strpath

=

string.Empty;

string

savepath

=

string.Empty;

string

stUrl

=

"/cgi-bin/media/get?access_token="

+

ACCESS_TOKEN

+

"&media_id="

+

MEDIA_ID;

HttpWebRequest

req

=

(HttpWebRequest)HttpWebRequest.Create(stUrl);

req.Method

=

"GET";

using

(WebResponse

wr

=

req.GetResponse())

{

HttpWebResponse

myResponse

=

(HttpWebResponse)req.GetResponse();

strpath

=

myResponse.ResponseUri.ToString();

WriteLog("接收类别://"

+

myResponse.ContentType);

WebClient

mywebclient

=

new

WebClient();

savepath

=

Server.MapPath("image")

+

"\\"

+

DateTime.Now.ToString("yyyyMMddHHmmssfff")

+

(new

Random()).Next().ToString().Substring(0,

4)

+

".jpg";

WriteLog("路径://"

+

savepath);

try

{

mywebclient.DownloadFile(strpath,

savepath);

file

=

savepath;

}

catch

(Exception

ex)

{

savepath

=

ex.ToString();

}

}

return

file;

}

class

wxmessage

{

public

string

FromUserName

{

get;

set;

}

public

string

ToUserName

{

get;

set;

}

public

string

MsgType

{

get;

set;

}

public

string

EventName

{

get;

set;

}

public

string

Content

{

get;

set;

}

public

string

Recognition

{

get;

set;

}

public

string

MediaId

{

get;

set;

}

public

string

EventKey

{

get;

set;

}

}private

wxmessage

GetWxMessage()

{

wxmessage

wx

=

new

wxmessage();

StreamReader

str

=

new

StreamReader(Request.InputStream,

System.Text.Encoding.UTF8);

XmlDocument

xml

=

new

XmlDocument();

xml.Load(str);

wx.ToUserName

=

xml.SelectSingleNode("xml").SelectSingleNode("ToUserName").InnerText;

wx.FromUserName

=

xml.SelectSingleNode("xml").SelectSingleNode("FromUserName").InnerText;

wx.MsgType

=

xml.SelectSingleNode("xml").SelectSingleNode("MsgType").InnerText;

if

(wx.MsgType.Trim()

==

"text")

{

wx.Content

=

xml.SelectSingleNode("xml").SelectSingleNode("Content").InnerText;

}

if

(wx.MsgType.Trim()

==

"event")

{

wx.EventName

=

xml.SelectSingleNode("xml").SelectSingleNode("Event").InnerText;

wx.EventKey

=

xml.SelectSingleNode("xml").SelectSingleNode("EventKey").InnerText;

}

if

(wx.MsgType.Trim()

==

"voice")

{

wx.Recognition

=

xml.SelectSingleNode("xml").SelectSingleNode("Recognition").InnerText;

}

if

(wx.MsgType.Trim()

==

"image")

{

wx.MediaId

=

xml.SelectSingleNode("xml").SelectSingleNode("MediaId").InnerText;

}

return

wx;

}///

<summary>

///

上传多媒体文件,返回

MediaId

///

</summary>

///

<param

name="ACCESS_TOKEN"></param>

///

<param

name="Type"></param>

///

<returns></returns>

public

string

UploadMultimedia(string

ACCESS_TOKEN,

string

Type)

{

string

result

=

"";

string

wxurl

=

"/upload/information/20201208/260/11377.jpg";(本地服务器的地址)

WriteLog("上传路径:"

+

filepath);

WebClient

myWebClient

=

new

WebClient();

myWebClient.Credentials

=

CredentialCache.DefaultCredentials;

try

{

byte[]

responseArray

=

myWebClient.UploadFile(wxurl,

"POST",

filepath);

result

=

System.Text.Encoding.Default.GetString(responseArray,

0,

responseArray.Length);

WriteLog("上传result:"

+

result);

UploadMM

_mode

=

JsonHelper.ParseFromJson<UploadMM>(result);

result

=

_mode.media_id;

}

catch

(Exception

ex)

{

result

=

"Error:"

+

ex.Message;

}

WriteLog("上传MediaId:"

+

result);

return

result;

}protected

string

sendPicTextMessage(Msg

_mode,

string

MediaId)

{

string

res

=

string.Format(@"<xml>

<ToUserName><![CDATA[{0}]]></ToUserName>

<FromUserName><![CDATA[{1}]]></FromUserName>

<CreateTime>{2}</CreateTime>

<MsgType><![CDATA[image]]></MsgType>