DialogProc函数要求声明它自身静态[重复](DialogProc function asking to declare it self static [duplicate])

 
 
 这个问题在这里已有答案： 
 
 
 
  
 静态函数 4中 无法访问的非静态成员 答案 
 
 
 
 
 这是我的createialogparam函数，它从这里调用DialogProc函数 - 
 
 HRESULT AMEPreviewHandler::CreatePreviewWindow()
    {
        assert(m_hwndPreview == NULL);
        assert(m_hwndParent != NULL);
        HRESULT hr = S_OK;

        m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this); /here the dialog proc function is called
        if (m_hwndPreview == NULL)
        {
          hr = HRESULT_FROM_WIN32(GetLastError());
        }
    ..........
    ...
    }
 
 这是DialogProc函数的定义 - 
 
BOOL CALLBACK AMEPreviewHandler::DialogProc(HWND m_hwndPreview, UINT Umsg, WPARAM wParam, LPARAM lParam) 
    { 
        static RECT m_rcParent ;

        switch(Umsg)
        {
        case WM_INITDIALOG: 
            {
            return 0;
            }
            break;
........
case WM_COMMAND:
            {  
                int ctl = LOWORD(wParam);
                int event = HIWORD(wParam);

                if (ctl == IDC_PREVIOUS && event == BN_CLICKED ) 
                {         

                    CreateHtmlPreview(); //it must be static now and it is not able to access the non static vraibles delared globally in the program
                    return 0;
                }     
}
}
 
 而声明是这样的 - 
 
 static BOOL CALLBACK DialogProc（HWND hWindow，UINT uMsg，WPARAM wParam，LPARAM lParam）; //假设它是静态的..如果静态则没有给出任何错误。如果它没有被声明为静态，则会给出错误 
 这里 - 
 
m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this); //error C2440: 'type cast' : cannot convert from 'overloaded-function' to 'DLGPROC'
 
 有没有办法在静态DialogProc中访问全局声明的变量，或者可以访问dialogproc中的全局声明的变量而不将这些变量声明为静态，因为它们在程序的其他部分也被用作非静态变量？ 

 
 
This question already has an answer here:
 
 
 
  
 Non-static members not accessible in static function  4 answers  
 
 
 
 
here is my createdialogparam function which is calling DialogProc function from here-
 
 HRESULT AMEPreviewHandler::CreatePreviewWindow()
    {
        assert(m_hwndPreview == NULL);
        assert(m_hwndParent != NULL);
        HRESULT hr = S_OK;

        m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this); /here the dialog proc function is called
        if (m_hwndPreview == NULL)
        {
          hr = HRESULT_FROM_WIN32(GetLastError());
        }
    ..........
    ...
    }
 
here is the definition of DialogProc function-
 
BOOL CALLBACK AMEPreviewHandler::DialogProc(HWND m_hwndPreview, UINT Umsg, WPARAM wParam, LPARAM lParam) 
    { 
        static RECT m_rcParent ;

        switch(Umsg)
        {
        case WM_INITDIALOG: 
            {
            return 0;
            }
            break;
........
case WM_COMMAND:
            {  
                int ctl = LOWORD(wParam);
                int event = HIWORD(wParam);

                if (ctl == IDC_PREVIOUS && event == BN_CLICKED ) 
                {         

                    CreateHtmlPreview(); //it must be static now and it is not able to access the non static vraibles delared globally in the program
                    return 0;
                }     
}
}
 
and the declaration is like this-
 
static BOOL CALLBACK DialogProc(HWND hWindow, UINT uMsg, WPARAM wParam, LPARAM lParam); //suppose it is static ..it is not giving any error if static ..If it is not declared static it gives error
 here -
 
m_hwndPreview = CreateDialogParam( g_hInst,MAKEINTRESOURCE(IDD_MAINDIALOG), m_hwndParent,(DLGPROC)DialogProc, (LPARAM)this); //error C2440: 'type cast' : cannot convert from 'overloaded-function' to 'DLGPROC'
 
Is there any way to access the globally declared variables inside the static DialogProc or it is possible to access the globally declared variables inside the dialogproc without declaring the those variables as static because t hey are also used as non static in other part of program ??

原文：https://stackoverflow.com/questions/17790479