DA VCL to ISAPI

Data Abstract
, ,
1

I’m in the process of converting a VCL DA project to an ISAPI dll. I have followed the limited info in http://old.wiki.remobjects.com/wiki/Platform_FAQs_(Data_Abstract)#How_do_I_create_an_ISAPI_DLL_with_Data_Abstract.3F

I used option 1 where I first created the server as a VCL project and then create a RO ISAPI in the same folder. After that I added all the units from the VCL project to the ISAPI project. I also replaced the #ROGEN declaration with the RODL file from the original VCL server.

After that I removed the IndyHttpServer component and replaced it with the WebBrokerServer component. Then I set the dispatcher properties accordingly

object Server: TROWebBrokerServer
Active = True
Dispatchers = <
item
Name = 'Message’
Message = Message
Enabled = True
PathInfo = '/BIN’
end>
SendClientAccessPolicyXml = captAllowAll
Left = 48
Top = 8
end

In the VCL, I run the server and got the correct output in the browser (http://localhost:8099) Once I patch the ISAPI dll into the IIS, there is no output at all. (http://localhost/isapi_scripts/MyISAPI.dll/bin). I have used the same IIS server for other ISAPI dll’s and those work good. I also tested the MegaDemo ISAPI project, and the MegaDemoISAPI.dll outputs XML (with or without the /bin path)

As the explanation in the above mentioned url is quite short, I must for sure have forgotten to do something. Any pointers on what more I have to do to get it working would be great

Thanks
Eivind

2

It’s a known Delphi behavior, this call

  Application.CreateForm(TServerDataModule, ServerDataModule);

doesn’t assign ServerDataModule for isapi.

workaround: assign it manually in OnCreate event:

procedure TServerDataModule.DataModuleCreate(Sender: TObject);
begin
  ServerDataModule := Self;
end;

in additionally, you may need to assign SessionManager and EventRepository manually in _Impl, like

procedure TDataService.DataAbstractServiceCreate(Sender: TObject);
begin
  Self.SessionManager := ServerDataModule.SessionManager;
  Self.EventRepository := ServerDataModule.GetEventRepository;
end;
3

Thanks for the info. I have set the ServerDataModule := Self; and Self.SessionManager := ServerDataModule.SessionManager in _Impl units.

However, my ServerDataModule does not have a GetEventRepository property. Should it? Do I need to drop a EventRepository from the component palette?

The ISAPI.dll still does not output any data so I guess I’m going to have to fix the GetEventRepository issue

Any further info would be great!

Eivind

4

no, this is optional component and is needed only you are using event sinks

can you create a simple testcase for this, pls? I’ll review and can detect what is wrong.
You can use PCTrade or Simple database shipped with DAD.