创建一个从CDialog派生的类 [英] Creating a class derived from CDialog

问题描述

亲爱的，
我正在创建一个从CDialog派生的类，假设该类名称为"CBase".
我希望它充当MFC的CDialog，并且从基类派生的任何类都将创建一个对话框.我该怎么办?
我尝试过休假

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

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()

}

但由于休假而出现错误
错误C2065:"_ UNKNOWN_RESOURCE_ID_":未声明的标识符
错误C2057:期望的常量表达式
当我创建类CBase&的对象时调用DoModal时，对话框未显示.
我该怎么办?

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?

推荐答案

您必须删除代码枚举{IDD = _UNKNOWN_RESOURCE_ID_};"
并更改构造函数，例如"CBase(UINT nIDD，CWnd * pParent = NULL);//标准构造函数"
自己输入的对话框ID！

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 !

作为对Glen响应的增强，中间类CBase不了解所使用的对话框ID.除非您创建一个您知道的对话框实例.因此，id必须是CBase中的参数/变量.
根据您实现Cderive类的方式，它可以使用enum构造，或者也必须对id使用参数/变量.

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.

如果_UNKNOWN_RESOURCE_ID_是对话框资源，那么.
只需在文件中#include resource.h.

if _UNKNOWN_RESOURCE_ID_ is the dialog resource then .
just #include resource.h in your file.

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