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dear,
I'm creating a class derived from CDialog, suppose that class name it is 'CBase'.
I want it acting as CDialog of MFC and any class derived from base create one dialog box. What can I do for it?
I tried out as fallows

C++
CBase : public Cdialog
{
    CBase(CWnd* pParent = NULL);   // standard constructor

    //{{AFX_DATA(CTestDlgBase)
    enum { IDD = _UNKNOWN_RESOURCE_ID_ };

    protected:
    virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV protected:

    DECLARE_MESSAGE_MAP()

}
Cderive : public CBase
{
Cderive(CWnd* pParent = NULL);   
   //{{AFX_DATA(CTestDlgBase)
   enum { IDD = _UNKNOWN_RESOURCE_ID_ };

   protected:
   virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV protected:

   DECLARE_MESSAGE_MAP()

}


but I got error as fallows
error C2065: '_UNKNOWN_RESOURCE_ID_' : undeclared identifier
error C2057: expected constant expression

also when I create object of class CBase & calling DoModal the dialog isn't shown.
What can I do for it?
Posted
Updated 5-Sep-10 23:33pm
v3
Comments
Sandeep Mewara 6-Sep-10 2:35am    
Use PRE tags to format your code part - it makes the question readable.

you must delete the code of "enum { IDD = _UNKNOWN_RESOURCE_ID_ };"
and change the constructor like "CBase(UINT nIDD ,CWnd* pParent = NULL); // standard constructor"
the dialog id put in by youself !
 
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As an enhancement to Glen's response, the intermediate class CBase has no knowledge of the dialog id used. It's not until you create a dialog instance you do know. Hence, the id must be an argument/variable in CBase.
Depending on how you implement your Cderive class, it can use the enum construct or it too has to use an argument/variable for the id.
 
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if _UNKNOWN_RESOURCE_ID_ is the dialog resource then .
just #include resource.h in your file.
 
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