# Can not join meeting when windows load **URL:** \ **Category:** Web\ **Created:** [March 23, 2020, 7:08pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341 "2020-03-23T19:08:04Z")\ **Posts on this page:** 14\ **Page:** 1
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 23, 2020, 7:08pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/1 "2020-03-23T19:08:04Z")
**Description** Here is my code $(document).ready(function() { console.log(‘checkSystemRequirements’); console.log(JSON.stringify(ZoomMtg.checkSystemRequirements())); ZoomMtg.setZoomJSLib(‘[https://source.zoom.us/1.7.2/lib](https://source.zoom.us/1.7.2/lib)’, ‘/av’); ZoomMtg.preLoadWasm(); ZoomMtg.prepareJssdk(); ``` ZoomMtg.init({ leaveUrl: 'http://www.zoom.us', isSupportAV: true, success: function () { ZoomMtg.join({ meetingNumber: '@meetingNumber', userName: '@userName', signature: '@signature', apiKey: '@apiKey', userEmail: 'email@gmail.com', passWord: '@passWord', success: function(res) { $('#nav-tool').hide(); console.log('join meeting success'); }, error: function(res) { console.log(res); } }); }, error: function (res) { console.log(res); } }); }); ``` **Error** I customize the sample code, i want to join meeting onload but always nothing happen? If i using button click it always message “fail to join” I code on MVC c# so @meetingNumber value from a viewbag What Error is here? Thank for read 🙂 ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [March 23, 2020, 10:44pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/2 "2020-03-23T22:44:08Z")
Hey @tranvuong1803, How are you generating the signature? Also what is the meeting ID you are trying to join? Thanks, Tommy ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 24, 2020, 1:05am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/3 "2020-03-24T01:05:56Z")
> [@tommy](#): > > signature Thank @tommy to answer my question I use these code to generate signature, The meeting id 9129153552 i created from API, i can join this meeting by join url [Launch - Zoom](http://zoom.us/j/9129153552&pwd) ```auto static readonly char[] padding = { '=' }; static void Main (string[] args) { Console.WriteLine ("Zoom copyright!"); Console.WriteLine ("generate websdk token!"); string apiKey = "apiKey"; string apiSecret = "apiSecret"; string meetingNumber = ""; String ts = ToTimestamp(DateTime.UtcNow.ToUniversalTime ()).ToString(); string role = "1"; string token = GenerateToken (apiKey, apiSecret, meetingNumber, ts, role); Console.WriteLine (token); } public static long ToTimestamp (DateTime value) { long epoch = (value.Ticks - 621355968000000000) / 10000; return epoch; } public static string GenerateToken (string apiKey, string apiSecret, string meetingNumber, string ts, string role) { string message = String.Format ("{0}{1}{2}{3}", apiKey, meetingNumber, ts, role); apiSecret = apiSecret ?? ""; var encoding = new System.Text.ASCIIEncoding (); byte[] keyByte = encoding.GetBytes (apiSecret); byte[] messageBytesTest = encoding.GetBytes (message); string msgHashPreHmac = System.Convert.ToBase64String (messageBytesTest); byte[] messageBytes = encoding.GetBytes (msgHashPreHmac); using (var hmacsha256 = new HMACSHA256 (keyByte)) { byte[] hashmessage = hmacsha256.ComputeHash (messageBytes); string msgHash = System.Convert.ToBase64String (hashmessage); string token = String.Format ("{0}.{1}.{2}.{3}.{4}", apiKey, meetingNumber, ts, role, msgHash); var tokenBytes = System.Text.Encoding.UTF8.GetBytes (token); return System.Convert.ToBase64String (tokenBytes).TrimEnd (padding); } } ``` ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 24, 2020, 1:43am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/4 "2020-03-24T01:43:26Z")
@tommy i findout that function generate signature C# error, i try generate with javascript is okie ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 24, 2020, 2:06am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/5 "2020-03-24T02:06:21Z")
what did i do to generate right signature from c# ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 24, 2020, 6:24am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/6 "2020-03-24T06:24:54Z")
Signature Generate from javascript: ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [March 24, 2020, 6:23pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/7 "2020-03-24T18:23:52Z")
Hey @tranvuong1803, They both appear correct, but maybe there is a bug in the c# example. Here is a Node.js signature sample app you could use in the meantime: [https://marketplace.zoom.us/docs/sdk/native-sdks/web/essential/signature#simple-signature-setup](https://marketplace.zoom.us/docs/sdk/native-sdks/web/essential/signature#simple-signature-setup) Related thread: > [@Invalid Signature C#](https://devforum.zoom.us/t/invalid-signature-c/6542): > > Description/Error When generating a signature from a .net core 3.0 api server using the c# example from ([https://marketplace.zoom.us/docs/sdk/native-sdks/Web-Client-SDK/tutorial/generate-signature](https://marketplace.zoom.us/docs/sdk/native-sdks/Web-Client-SDK/tutorial/generate-signature)) it fails with an invalid signature error. {method: “join”, status: false, errorCode: 1, errorMessage: “Invalid signature.”, result: null} C# Code: Where as using ZoomMtg.generateSignature with the same data works. var signature = ZoomMtg.generateSignature({ meetingNumber: data.me… Thanks, Tommy ---
**Author:** ![JackYang](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jackyang/32/1135_2.png) [@JackYang](https://devforum.zoom.us/u/JackYang)\ **Post date:** [March 27, 2020, 8:40am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/8 "2020-03-27T08:40:07Z")
try string ts = ToTimestamp(DateTime.UtcNow.ToUniversalTime()).ToString(); change to String ts = ToTimestamp(DateTime.UtcNow.ToUniversalTime() - 30000).ToString(); if your sever go ahead zoom server, it will casue signature expired issue and try syc your server time ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 27, 2020, 8:53am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/9 "2020-03-27T08:53:23Z")
> [@JackYang](#): > > if your sever go ahead zoom server, it will casue signature expired issue thank, i will try it ---
**Author:** ![tranvuong1803](https://avatars.discourse-cdn.com/v4/letter/t/0ea827/32.png) [@tranvuong1803](https://devforum.zoom.us/u/tranvuong1803)\ **Post date:** [March 27, 2020, 10:04am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/10 "2020-03-27T10:04:19Z")
> [@JackYang](#): > > ToTimestamp hey Jack, can not subtract datetime and int? “DateTime.UtcNow.ToUniversalTime() - 30000” is that right? ---
**Author:** ![JackYang](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/jackyang/32/1135_2.png) [@JackYang](https://devforum.zoom.us/u/JackYang)\ **Post date:** [March 27, 2020, 1:05pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/11 "2020-03-27T13:05:18Z")
sorry make mistake, String ts = (ToTimestamp(DateTime.UtcNow.ToUniversalTime ()) - 30000).ToString(); ---
**Author:** ![manishkumarmm93](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/manishkumarmm93/32/3956_2.png) [@manishkumarmm93](https://devforum.zoom.us/u/manishkumarmm93)\ **Post date:** [March 30, 2020, 4:46am UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/12 "2020-03-30T04:46:10Z")
> [@tranvuong1803](#): > > ZoomMtg Hi, I had written Jquery customize. I found one error . That is “Uncaught ReferenceError: ZoomMtg is not defined” how can i define ZoomMtg ? This is my code $(document).ready(function () { ``` console.log('checkSystemRequirements'); console.log(JSON.stringify(ZoomMtg.checkSystemRequirements())); ZoomMtg.setZoomJSLib('https://source.zoom.us/1.7.2/lib', '/av'); ZoomMtg.preLoadWasm(); ZoomMtg.prepareJssdk(); ``` Thanks ---
**Author:** ![tommy](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/tommy/32/72769_2.png) [@tommy](https://devforum.zoom.us/u/tommy)\ **Post date:** [March 30, 2020, 7:14pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/13 "2020-03-30T19:14:15Z")
Hey @manishkumarmm93, Have you added the script in your index.html so ZoomMtg is globally available? > Thanks, Tommy ---
**Author:** ![DeveloperBot](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/developerbot/32/12632_2.png) [@DeveloperBot](https://devforum.zoom.us/u/DeveloperBot)\ **Post date:** [August 21, 2020, 7:35pm UTC](https://devforum.zoom.us/t/can-not-join-meeting-when-windows-load/9341/14 "2020-08-21T19:35:51Z")
Closed on August 21, 2020, 7:35pm UTC