We have the following class we want to use to update the console from within a procedure on a datamodule using Indy.
TLog = class(TIdNotify)
protected
FMsg: string;
procedure DoNotify; override;
public
class procedure LogMsg(const AMsg : string);
end;
procedure TLog.DoNotify;
begin
writeln(fMsg); //this is probably completely wrong
end;
class procedure TLog.LogMsg(const AMsg: string);
begin
with TLog.Create do
try
FMsg := AMsg;
Notify;
except
Free;
raise;
end;
end;
We want to then send messages back like this
procedure THTTPServer.httpServerCommandGet(
AContext: TIdContext;
ARequestInfo: TIdHTTPRequestInfo;
AResponseInfo: TIdHTTPResponseInfo);
begin
TLog.LogMsg('test');
This is not working.
Does anyone have a simple working version of a console app which is synchronized threads on the datamodule and the console? I'm not even sure if that is the problem tbh
We are struggling to make sense of the documentation.
We had a brief look at this code, but it didn't work for us
How to create a console application that does not terminate?
Your TLog code is fine. The problem is, by default, a console application simply does not have a message loop, so there is nothing running to process the TIdNotify requests automatically, like in a GUI app. That is why your code is not working in a console app.
Your console app's main entry point needs to call the RTL's CheckSynchronize() function periodically. You can use the RTL's SyncEvent handle to detect when there are pending requests waiting to be processed.
Try something like this:
program MyApp;
{$APPTYPE CONSOLE}
uses
..., Classes, Windows;
...
begin
...
while not SomeCondition do
begin
...
if WaitForSingleObject(SyncEvent, 100) = WAIT_OBJECT_0 then
CheckSynchronize;
...
end;
...
end.