Message Handling for a dialog in a dll

[leonwoo]

Hi, I have a really tough problem relating to MFC and DLL. I have developed a MFC Dll that displays a dialog when it is called by a MFC MDI application. What I did was that first I dynamically created a button on the SDI toolbar by passing the toolbar pointer to the Dll. Then I clicked on the button and a modeless dialog poped up. The modeless dialog contains a 'CMonthCalCtrl' calendar control, an 'insert' button, and a 'cancel' button. When I clicked on the 'insert' button, the Dll should insert the selected date into an already opened MDI edit view. However, I have no idea how to bridge the gap between the MDI view and the Dll (i.e. I do not know how to pass back the date to the view). I have tried to search for related resource on the net but gained no clue and I need the solution desperately. You have any neat solution?? Thanks in advance.:-O leonwoo

[valikac]

Pass in whatever function you call from the DLL a reference to a variable. In the DLL, assign whatever you want to that variable, which in this case is a date. Kuphryn

[leonwoo]

Thanks for the prompt reply. Another question is how do I detect button click from the dialog? I need to insert the date into the view whenever i click on the 'insert' button. The MDI application somehow has to detect the button click and then return the reference variable. thanks. leonwoo

[Steen Krogsgaard]

I would pass the handle of the view to the dialog and then send a private message to the view from the dialog. In the LPARAM I would pass the relevant information. If your data does not fit into the four bytes I would use an automatic structure to hold the data and call SendMessage. Do not allocate the struct with new in the dll and delete it with delete in the main app, that will corrupt the heaps. Cheers Steen. "To claim that computer games influence children is ridiculous. If Pacman had influenced children born in the 80'ies we would see a lot of youngsters running around in dark rooms eating pills while listening to monotonous music"