非模式对话框下 点击按钮，弹出模式对话框

/*------------------------------------------
   ABOUT1.C -- About Box Demo Program No. 1
               (c) Charles Petzold, 1998
   ------------------------------------------*/

#include <windows.h>
#include "resource.h"


static HINSTANCE g_hInst=NULL;

LRESULT CALLBACK WndProc      (HWND, UINT, WPARAM, LPARAM) ;

BOOL    CALLBACK MainDlgProc (HWND, UINT, WPARAM, LPARAM) ;    //主对话框

BOOL    CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;    //关于对话框

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
//      static TCHAR szAppName[] = TEXT ("About1") ;
//      MSG          msg ;
//      HWND         hwnd ;
//      WNDCLASS     wndclass ;
//      
//      wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
//      wndclass.lpfnWndProc   = WndProc ;
//      wndclass.cbClsExtra    = 0 ;
//      wndclass.cbWndExtra    = 0 ;
//      wndclass.hInstance     = hInstance ;
//      wndclass.hIcon         = LoadIcon (hInstance, szAppName) ;
//      wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
//      wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ;
//      wndclass.lpszMenuName  = szAppName ;
//      wndclass.lpszClassName = szAppName ;
//      
//      if (!RegisterClass (&wndclass))
//      {
//           MessageBox (NULL, TEXT ("This program requires Windows NT!"),
//                       szAppName, MB_ICONERROR) ;
//           return 0 ;
//      }
//      
//      hwnd = CreateWindow (szAppName, TEXT ("About Box Demo Program"),
//                           WS_OVERLAPPEDWINDOW,
//                           CW_USEDEFAULT, CW_USEDEFAULT,
//                           CW_USEDEFAULT, CW_USEDEFAULT,
//                           NULL, NULL, hInstance, NULL) ;
//      
//      ShowWindow (hwnd, iCmdShow) ;
//      UpdateWindow (hwnd) ; 

    HWND g_Dlghwnd;

    MSG msg;


    g_hInst=hInstance;

     
    g_Dlghwnd=CreateDialog(g_hInst,MAKEINTRESOURCE(IDD_MAIN_DIALOG),NULL,MainDlgProc);

     while (GetMessage (&msg, NULL, 0, 0))
     {
         if(g_Dlghwnd==NULL || IsDialogMessage(g_Dlghwnd,&msg))
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }
     return msg.wParam ;


    //DialogBox(g_hInst,MAKEINTRESOURCE(IDD_MAIN_DIALOG),NULL,MainDlgProc);
}





BOOL CALLBACK MainDlgProc(HWND hDlg, UINT message,   WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
        
    case WM_COMMAND :
        switch (LOWORD (wParam))
        {
        case IDOK :
        case IDCANCEL :
        //    EndDialog (hDlg, 0) ;
            DestroyWindow(hDlg);
            return TRUE ;
        case IDC_BUTTON1:    //关于对话框的id
            DialogBox (g_hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hDlg, AboutDlgProc) ;

        }
        break ;

        case WM_CLOSE:
            DestroyWindow(hDlg);
            break;

        default:
            return DefWindowProc(hDlg,message,wParam,lParam);
    }
    return FALSE ;
}


BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message, 
                            WPARAM wParam, LPARAM lParam)
{
     switch (message)
     {

          
     case WM_COMMAND :
          switch (LOWORD (wParam))
          {
          case IDOK :
          case IDCANCEL :
               EndDialog (hDlg, 0) ;
               return TRUE ;
          }
          break ;

          case WM_CLOSE:
              EndDialog(hDlg,0);
          default:
              return DefWindowProc(hDlg,message, wParam,lParam);
     }
     return FALSE ;
}