How to solve the problem of working with a dialog class in an MFC project?

Question

C++ / C#

MSVS 2010. There is a dialog application based on MFC. There is some controller class in which I want to store a pointer to the dialog object for subsequent interaction. But when you try to attach the dialog header file ( Project_nameDlg.h ) to the controller, the compiler starts swearing at all sorts of nonsense (that the define-constant IDD_PROJECT_NAME_DIALOG is not defined - the identifier of the dialog in resource.h, and there it swears that ";" is expected before the constants ).
Clearly: let there be a dialog class CProject_nameDlg and another class Test, with a pointer to the first one.

/* Project_nameDlg.h */
#pragma once
#include "afxwin.h"

class CProject_nameDlg : public CDialog {
public:
  CProject_nameDlg(CWnd* pParent = NULL);	// standard constructor
  enum { IDD = IDD_PROJECT_NAME_DIALOG };
.......
};

/* Test.h */
#include "Project_nameDlg.h"

stuct Test {
  CProject_nameDlg* ptr_;

  Test(CProject_nameDlg* ptr)  :  ptr_( ptr ) { }
 };

I suspect that this is somehow related to resources and some kind of internal code generation, which gets lost at the second inclusion of the ill-fated dialog class. Forces to do "intelligent interface" instead of MVC. But everything should not be so clumsy, maybe there is some kind of workaround?

Answer 1

The problem was solved by a hard forced inclusion resource.hin the dialog header file ( Project_nameDlg.h). Because there are define constants, then there will be no collision (overridden), but I will be sure that I will not catch

undeclared identifier IDD_PROJECT_NAME_DIALOG

Also found:
stackoverflow.com/questions/20651931/how-to-access...

Answer 2

There is probably something wrong with the order of the includes (maybe even in the place where it says #include "Test.h").
Try adding at the beginning of Test.h :
#pragma once
#include "afxwin.h"