How to inherit a MFC class.

[chaitannya_m]

Hi everyone, In my application i am using a hell lot no. of list controls. So i have defined a CCustomListCtrl class derived from CListCtrl class. I have defined the NM and WM functionalities and other stuff in it and it runs just the way i want it. Now i want to define rest of the class derived from CCustomListCtrl. When i do this compiler gives an error unresolved external symbol "public: virtual int __thiscall CCustomList::PreTranslateMessage(struct tagMSG *)" (?PreTranslateMessage@CCustomList@@UAEHPAUtagMSG@@@Z) All the errors are related to the WM and NM .I guess the problem is in BEGIN_MESSAGE_MAP(CCustomListCtrl, CListCtrl) macro. How do i remove this error.

[baerten]

Hi, could you please post some code, so that we see how you define the rest of the class Regards

[sps itsec46]

It's not really much info you posted but check if the declaration and definition of the method PreTranslateMessage() is correct. When I look at your BEGIN_MESSAGE_MAP macro your class seems to be called CCustomListCtrl but the definition of PreTranslateMessage() contains a class named CCustomList:

CCustomList::PreTranslateMessage(struct tagMSG *)

cheers, mykel OMM: "Let us be thankful we have an occupation to fill. Work hard, increase production, prevent accidents and be happy."

[Sam_c]

class to message map is incorrect CCustomListCrtl <- Message map CCustomList <- Class this could be the problem :) if it isnt a bit more code would help thanks :)

[jhwurmbach]

chaitannya_m wrote:

BEGIN_MESSAGE_MAP(CCustomListCtrl, CListCtrl)

The Syntax here is BEGIN_MESSAGE_MAP(Classname, Baseclassname) Did you turn it around?

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Failure is not an option - it's built right in.

[chaitannya_m]

Hey thanks.. Great observation ...!!! the error was there.. There was another class CCustomList which i delete because i completely messed up with.. Code is working fine now

[sps itsec46]

You're welcome! Perhaps next time use search and replace when you rename your classes... ;P

cheers, mykel OMM: "Let us be thankful we have an occupation to fill. Work hard, increase production, prevent accidents and be happy."