We help IT Professionals succeed at work.

Check out this week's podcast, "Dairy Farms to Databases: Community's Hand in Technology"Listen Now


DDEPoke Structure

Dazza051197 asked
Last Modified: 2010-04-06
Has anyone got any information/examples regarding the DDEPoke
facility.  As I'm sending data to a 3rd party application that wants
the data in it's own format, I can't use the DDE components that came
with Delphi, so I have to use the Win API ones.  I've managed to
receive data but I've got a problem when it comes to sending data.

I've got something like this so far, but it keeps crashing the 3rd
party application.

  ItemAtom : TAtom;
  hData : THandle;
  poke : ^TDDEPoke;
  gc   : TMyData;
   hData:=GlobalAlloc(GHND or GMEM_DDESHARE ,

   if poke=NIL then
   poke^.cfformat:=cfGrail;   { Already registered with the clipboard


   itematom := GlobalAddAtom('CONFERENCE');
   if PostMessage(hWndGrail,wm_DDE_POKE,
Handle,MAKELPARAM(hData,itematom)) then

etc. etc.

Anyone done anything like this and can shed any light onto the matter

Watch Question

When do you dispose the memory block?



Memory block disposed of when I receive a DDEAck from the other application.  But I never get that far because the other app GPF's.  If I mess around with the GMEM_xxxx options then I sometimes get the other app not to GPF but it doesnt get the actual data I'm sending, it gets some garbage.

Is this 16 or 32-bit?



I'm writing it in 32 bit Delphi 2, but the database application I'm talking to is only 16 bit, but does work ok on Win 95 and NT.
This one is on us!
(Get your first solution completely free - no credit card required)


Apologies for my late reply.  You pointed me in the right direction, the problem was with the 32 bit handle being a long and the 16 bit application I'm talking to didn't like it.  I needed to be able to make a long up from my 2 integers so 32 bit Delphi is out of the question, I've now compiled my program successfully in 16 bit Delphi (thank goodness they put that on the CD with Delphi 2).  Any one know how to get a 16 bit handle to a global memory location so I dont need 2 applications.

Hummm... A possibility would be writing the DDE part in a 16-bit DLL and then thunk down calling it from your app.



Gain unlimited access to on-demand training courses with an Experts Exchange subscription.

Get Access
Why Experts Exchange?

Experts Exchange always has the answer, or at the least points me in the correct direction! It is like having another employee that is extremely experienced.

Jim Murphy
Programmer at Smart IT Solutions

When asked, what has been your best career decision?

Deciding to stick with EE.

Mohamed Asif
Technical Department Head

Being involved with EE helped me to grow personally and professionally.

Carl Webster
CTP, Sr Infrastructure Consultant
Empower Your Career
Did You Know?

We've partnered with two important charities to provide clean water and computer science education to those who need it most. READ MORE

Ask ANY Question

Connect with Certified Experts to gain insight and support on specific technology challenges including:

  • Troubleshooting
  • Research
  • Professional Opinions
Unlock the solution to this question.
Join our community and discover your potential

Experts Exchange is the only place where you can interact directly with leading experts in the technology field. Become a member today and access the collective knowledge of thousands of technology experts.

*This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.


Please enter a first name

Please enter a last name

8+ characters (letters, numbers, and a symbol)

By clicking, you agree to the Terms of Use and Privacy Policy.