Undeclared Identifier on a Menu Item Entry

Question

I've edited the IDR_MAINFRAME menu resource (added a menu item "Simulation" ). The property says the ID for this menu item cannot be edited. OK. I the added a submenu item ("General Parameters") which ID is "ID_SetParameters". So far things are okay. Compiles and executes with no errors, the menu item shows up in the menu, and I can select the "Simulation" menu item and the submenu displays. So far Okay. Now I try to add an event handler for the submenu item "General Parameters" in the document class with the Add Event Handler drop-down option (I also tried the Class Wizard with the same end result) which successfully added code into the CDocument file :

The CRSimDoc.cpp file:

BEGIN_MESSAGE_MAP(CRSimDoc, CDocument)
   ON_UPDATE_COMMAND_UI( ID_SetParameters, &CRSimDoc::OnUpdateSetParameters )
   ON_COMMAND(           ID_SetParameters, &CRSimDoc::OnSetParameters )
END_MESSAGE_MAP()
...
void CRSimDoc::OnUpdateSetParameters( CCmdUI* pCmdUI )
{    // TODO: Add your command update UI handler code here } 

void CRSimDoc::OnSetParameters()
{    // TODO: Add your command handler code here } 

and in the CRSimDoc.h file:
   afx_msg void OnUpdateSetParameters( CCmdUI* pCmdUI );
   afx_msg void OnSetParameters(); 

Compiling generates :
error C2065: 'ID_SetParameters': undeclared identifier
error C2065: 'ID_SetParameters': undeclared identifier

Whats happenning?

Answer 1

The menu editor will add the definition of ID_SetParameters to the resource.h header file. This header must be available when the CRSimDoc.cpp file is compiled. One way would be to directly include the header by adding a #include "resource.h" statement in the file or otherwise ensuring that it has been included in a different header file that CRSimDoc.cpp is already referencing.

Answer 2

Thanks - for some reason the resource.h file wasn't being included in the build. All better now, and thanks for the quick response.