functiondelphitms-web-coredelphi-12-athens

How to call an async function in TMS WEB Core?

I've got a simple function in Delphi that is marked as an [async] function.

Currently, the function doesn't do anything. It literally just returns a Boolean value of True:

[async]
function MyAsyncFunction(): Boolean;

implementation

function MyAsyncFunction(): Boolean;
begin
  Result := True;
end;

But then every time I try to use the function like:

if MyAsyncFunction then
begin
  // Do Stuff
end;

then I get the following error:

[Error] Boolean expected, but Context found

What is Context and what is the correct way to call an async function in TMS WEB Core using Delphi?

Solution

  • @DalikaPrasnikar gave a great link in the comments regarding async in TMS WEB Core.

    Turns out that I simply had to wrap my call to MyAsyncFunction in an Await function like this:

    if Await(MyAsyncFunction) then
begin
  // Do Stuff
end;

    And then it works

    But you need to mark the method you're calling from as [async] as well otherwise you'll get an await only available in async procedure error.