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Websocket? |
Mon, Dec 19 2022 6:05 PM | Permanent Link |
marcusf | Are there any examples on how to use the TSocket / TWebSocket components?
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Tue, Dec 20 2022 10:50 AM | Permanent Link |
marcusf | marcusf wrote:
Are there any examples on how to use the TSocket / TWebSocket components? I'm using the esegece websocket library on the server. |
Wed, Dec 21 2022 9:07 AM | Permanent Link |
Raul Team Elevate | <<marcusf wrote:
Are there any examples on how to use the TSocket / TWebSocket components? >> Have not tried in a while but in a nutshell you'd need to do following: 1. Current WebSock unit has couple of small bugs - you need to fix up GetURL and GetProtocol functions and return "Result:='';" (they currently use Result:=False for 2nd half of ifdef); 2. Then add unit to library as i don't believe it's there by default - i.e. Library->Add to Library and then use TSocket as class name and unit file should point to fixed up WebSock.wbs unit 3. Make sure library reloads - i'd restart IDE 4. Now you should have a new TSocket component in the designer and can drop it on form etc 5. socket "Open" opens connection - specify url and port (i.e. Socket1.Open('ws://192.168.0.1:8001); 6. OnMessage handler should fire for incoming data messages 7. socket "send" sens a message you specify on existing connection Raul |
Wed, Dec 21 2022 10:49 AM | Permanent Link |
marcusf | <<Raul wrote:
<<marcusf wrote: Are there any examples on how to use the TSocket / TWebSocket components? >> Have not tried in a while but in a nutshell you'd need to do following: 1. Current WebSock unit has couple of small bugs - you need to fix up GetURL and GetProtocol functions and return "Result:='';" (they currently use Result:=False for 2nd half of ifdef); 2. Then add unit to library as i don't believe it's there by default - i.e. Library->Add to Library and then use TSocket as class name and unit file should point to fixed up WebSock.wbs unit 3. Make sure library reloads - i'd restart IDE 4. Now you should have a new TSocket component in the designer and can drop it on form etc 5. socket "Open" opens connection - specify url and port (i.e. Socket1.Open('ws://192.168.0.1:8001); 6. OnMessage handler should fire for incoming data messages 7. socket "send" sens a message you specify on existing connection Raul >> Thanks Raul, I've done that but I'm getting an odd error when trying to open(). When I use Run, in EWB I get "SecurityError" and in Chrome pointed at the same url I get "SyntaxError: Failed to construct 'WebSocket': The SubProtocol '' is invalid" |
Wed, Dec 21 2022 11:12 AM | Permanent Link |
marcusf | I got it working
I had to make a change to webdom.wbs as well. I added: constructor Create(const url: String); to the external TWebSocket emit WebSocket = class public section and added this to the TSocket class procedure TSocket.Open(const URL: String); begin {$IFDEF BROWSER} FWebSocket:=TWebSocket.Create(Url); Initialize; {$ENDIF} end; And now it connects and I successfully sent a test message. |
Wed, Dec 21 2022 11:20 AM | Permanent Link |
marcusf | Interestingly though, I still get the error in EWB but it works in Chrome.
Also the events do not seem to work. I can see the data in Chrome inspector but onConnected and onMessage does not trigger. |
Wed, Dec 21 2022 12:32 PM | Permanent Link |
marcusf | This is an interesting puzzle.
So the SecurityError likely comes from the embedded IE browser. A recent update doesn't like to open local websocket connections. Not sure why the events werent firing but when I use TWebSocket directly (Not TSocket) and manually assign event handlers, it works fine so I'll go that route for now. I'll keep going with this and see if I run into any other issues. |
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