windows程序设计 11章的about3 问题 模式对话框 子窗口

(1)没有按下菜单时，WndProc（）执行，而AboutDlgProc（）和EllipPushWndProc（）不执行。（2）按下菜单时，WndProc（）中执行：DialogBox (hInstance, TEXT ("AboutBox"), hwnd, AboutDlgProc) ;创建模式对话框About，其AboutDlgProc（）执行， 此时*.rc里的 CONTROL  "OK",IDMM,"EllipPush",WS_GROUP | WS_TABSTOP,73,79,32,14表明对话框About中有一个子窗口作为一个窗口有消息处理函数EllipPushWndProc，然后

EllipPushWndProc（）执行，其中的WM_PAINT会画一个椭圆。当按下这个窗口时时，响应case   WM_LBUTTONUP :SendMessage (GetParent (hwnd), WM_COMMAND,   

GetWindowLong (hwnd, GWL_ID), (LPARAM) hwnd) ;发送IDMM这个命令给其父窗口(对话框About),在对话框About的事件处理函数AboutDlgProc()中处理IDMM:case IDMM :               EndDialog (hDlg, 0) ;其中关闭了对话框.

注意：WndProc：RegisterClass（）了，CreateWindow（）了。EllipPushWndProc: 只RegisterClass（），但

没有CreateWindow（）,但为什么最后能正常运行呢？是因为*.rc里的 CONTROL  "OK",IDMM,"EllipPush",WS_GROUP | WS_TABSTOP,73,79,32,14会被转换成一个CreateWindow()函数.当编译资源描述档时，这条叙述在.RES和.EXE文件中的编码是相同的:即CONTROL这行就相当于

CreateWindow(),而且CONTROL后面的相关参数与CreateWindow()的参数一样,这也说明了这一点.

=========================================================源代码如下(由windows程序设计第11章的about3程序修改而来):

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

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;BOOL    CALLBACK AboutDlgProc (HWND, UINT, WPARAM, LPARAM) ;LRESULT CALLBACK EllipPushWndProc (HWND, UINT, WPARAM, LPARAM) ;

 static WNDCLASS     wndclass ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,                    PSTR szCmdLine, int iCmdShow){     static TCHAR szAppName[] = TEXT ("About3") ;     MSG          msg ;     HWND         hwnd ;   

     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 ;     }          wndclass.style         = CS_HREDRAW | CS_VREDRAW ;     wndclass.lpfnWndProc   = EllipPushWndProc ;     wndclass.cbClsExtra    = 0 ;     wndclass.cbWndExtra    = 0 ;     wndclass.hInstance     = hInstance ;     wndclass.hIcon         = NULL ;     wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;     wndclass.hbrBackground = (HBRUSH) (COLOR_BTNFACE + 1) ;     wndclass.lpszMenuName  = NULL ;     wndclass.lpszClassName = TEXT ("EllipPush") ;

     RegisterClass (&wndclass) ;          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) ;           while (GetMessage (&msg, NULL, 0, 0))     {          TranslateMessage (&msg) ;          DispatchMessage (&msg) ;     }     return msg.wParam ;}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){     static HINSTANCE hInstance ;          switch (message)     {     case WM_CREATE :          hInstance = ((LPCREATESTRUCT) lParam)->hInstance ;          return 0 ;               case WM_COMMAND :          switch (LOWORD (wParam))          {          case IDM_APP_ABOUT ://打开模式对话框ABOUT               DialogBox (hInstance,  MAKEINTRESOURCE(ABOUTBOX), hwnd, AboutDlgProc) ;               return 0 ;          }          break ;               case WM_DESTROY :          PostQuitMessage (0) ;          return 0 ;     }     return DefWindowProc (hwnd, message, wParam, lParam) ;}

BOOL CALLBACK AboutDlgProc (HWND hDlg, UINT message,                             WPARAM wParam, LPARAM lParam){     switch (message)     {     case WM_INITDIALOG :          return TRUE ;               case WM_COMMAND :          switch (LOWORD (wParam))          {          case IDMM ://子窗口的ID号               EndDialog (hDlg, 0) ;               return TRUE ;          }          break ;     }     return FALSE ;}

LRESULT CALLBACK EllipPushWndProc (HWND hwnd, UINT message,                                    WPARAM wParam, LPARAM lParam){     TCHAR       szText[40] ;     HBRUSH      hBrush ;     HDC         hdc ;     PAINTSTRUCT ps ;     RECT        rect ;          switch (message)     {     case WM_PAINT ://画一个椭圆          GetClientRect (hwnd, &rect) ;          GetWindowText (hwnd, szText, sizeof (szText)) ;                    hdc = BeginPaint (hwnd, &ps) ;                    hBrush = CreateSolidBrush (GetSysColor (COLOR_WINDOW)) ;          hBrush = (HBRUSH) SelectObject (hdc, hBrush) ;          SetBkColor (hdc, GetSysColor (COLOR_WINDOW)) ;          SetTextColor (hdc, GetSysColor (COLOR_WINDOWTEXT)) ;                    Ellipse (hdc, rect.left, rect.top, rect.right, rect.bottom) ;          DrawText (hdc, szText, -1, &rect,                    DT_SINGLELINE | DT_CENTER | DT_VCENTER) ;                    DeleteObject (SelectObject (hdc, hBrush)) ;                    EndPaint (hwnd, &ps) ;          return 0 ;               case WM_KEYUP :          if (wParam != VK_SPACE)               break ;                                                  case WM_LBUTTONUP ://向其父窗口(对话框About)发信息,包含了ID号IDMM,然后About会响应case  

   //WM_COMMAND : ...     case IDMM :...          SendMessage (GetParent (hwnd), WM_COMMAND,               GetWindowLong (hwnd, GWL_ID), (LPARAM) hwnd) ;          return 0 ;     }     return DefWindowProc (hwnd, message, wParam, lParam) ;}