> Francois, what is the best way to handle this one? I can set a 'flag' within
> the LocationChange handler and use it to Abort the client at a later moment
> (or discard its content etc). I've also seen people talk about using
> PostMessage but I'm not sure how to do that. How would I create a message
> and use a handle for the processing object? (my own 'download-manager'
> object for instance).
To use PostMessage, you must :
1) Declare a unique constant which is the message number
const WM_MY_MSG = WM_USER + 123; // Select a unique number !
2) Declare a message handler in the form where you dropped the component
procedure WMMyMsg(var msg: TMessage); message WM_MY_MSG;
3) Implement the procedure to do what you need to do:
procedure TForm1.WMMyMsg(var msg: TMessage);
begin
// Whatever you need
end;
4) Then you may PostMessage from anywhere
PostMessage(Form1.Handle, WM_MY_MSG, myWParam, myLParam);
It is frequently conveniant to pass a component reference in one of the message
parameters and
anything else you like in the other. You must cast it to LParam or WParam.
PostMessage(Form1.Handle, WM_MY_MSG, 0, LParam(HttpCli1));
in the handler:
HttpClient := THttpCli(msg.LParam);
Be aware to not destroy the component before the posted messages are handled !
If you need to
destroy the component, then you must keep track of resulting invalid
references. For example
maintain a list of components, give an ID to each one. When you postmessage,
you check if the
reference (LParam) is still in the list with same ID (WParam).
There are a lot of example of message posting in all ICS components.
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