PowerBuilder

Async Accept Socket Connection

See more Socket/SSL/TLS Examples

Demonstrates how to get the connected client socket after accepting a connection asynchronously. PowerBuilder

integer li_rc
integer li_Success
oleobject loo_ListenSocket
integer li_MaxWaitMs
oleobject loo_AcceptTask
oleobject loo_ConnectedClient

li_Success = 0

// This example assumes the Chilkat Socket API to have been previously unlocked.
// See Socket Unlock Sample for sample code.

loo_ListenSocket = create oleobject
li_rc = loo_ListenSocket.ConnectToNewObject("Chilkat.Socket")
if li_rc < 0 then
    destroy loo_ListenSocket
    MessageBox("Error","Connecting to COM object failed")
    return
end if

// Bind to a port and listen.
// This example will listen at port 5555 and allows for a backlog
// of 25 pending connection requests.
li_Success = loo_ListenSocket.BindAndListen(5555,25)
if li_Success <> 1 then
    Write-Debug loo_ListenSocket.LastErrorText
    destroy loo_ListenSocket
    return
end if

// Start a background task to accept an incoming connection ...
li_MaxWaitMs = 20000
loo_AcceptTask = loo_ListenSocket.AcceptNextConnectionAsync(li_MaxWaitMs)
loo_AcceptTask.Run()

// ...
// ...
// ...

// Imagine at this point the task has completed successfully,
// and a connection was accepted.  Here's how to get the connected socket...
loo_ConnectedClient = create oleobject
li_rc = loo_ConnectedClient.ConnectToNewObject("Chilkat.Socket")

li_Success = loo_ConnectedClient.LoadTaskResult(loo_AcceptTask)

// Here's how it works:  The AcceptNextConnection method would normally
// return a socket object when called synchronously.  When called asynchronously,
// it cannot do so because it returns the task object.  When the async method
// (running in a background thread) completes, the socket object that is the client
// connection is contained within the task object.
// 
// This can be generalized for any case where a Chilkat method returns an object.
// The async version of that method is such that the object returned in the background
// thread is contained within the task object.

// To get the result object, we create a new object instance of that type.
// In this case, we create a socket object (connectedClient).  There is a LoadTaskResult
// method in all Chilkat classes that can be a return value of an async method call.
// The LoadTaskResult method transfers the returned object from the task to the caller.


destroy loo_ListenSocket
destroy loo_ConnectedClient