子窗口控件(1)瞟一眼按钮类

下面这个程序，在单击每个按钮时，该按钮会向其父窗口发送WM_COMMAND消息，这个窗口过程就是我们所熟悉的WindowProc，函数将在客户区的右侧显示这个消息的wParam和lParam参数

创建子窗口的参数如下

类名TEXT("button")窗口文本button[i].szText窗口样式WS_CHILD|WS_VISIBLE|button[i].iStyleX坐标cxCharY坐标cyChar*(1+2*i)宽度20*xChar高度7*yChar/4父窗口hwnd子窗口ID(HMUNE)i案例句柄((LPCREATESTRUCT)lParam)->hInstance额外参数NULL

其中案例句柄可以声明一个全局变量(HINSTANCE hInst;)，然后在WinMain赋值 hInst=hInstance;

 

列表框，按钮控件，编辑控件相应的wParam,lParam变量的含义是一样的

LOWORD(wParam)子窗口IDHIWORD(wParam)通知码lParam子窗口

 

在后面的博客中，会多次出现

cxClient=LOWORD(lParam);switch (LOWORD (wParam))//低位wParam获取通知码             {            case SB_PAGEDOWN :           ......

case WM_VSCROLL :            i = GetWindowLong ((HWND) lParam, GWL_ID) ;                        switch (LOWORD (wParam))//低位wParam获取通知码             {            case SB_PAGEDOWN :                 color[i] += 15 ;

 switch (message)//确定焦点，实现用tab键来转换焦点        {       case WM_KEYDOWN :            if (wParam == VK_TAB)                 SetFocus (GetDlgItem (GetParent (hwnd),   

诸如此类的东西，大家要弄明白wParam,lParam参数在不同的环境，所代表的意义。

 

看完整程序：

#include<windows.h>struct{int iStyle;TCHAR * szText;}button[]={BS_PUSHBUTTON ,TEXT("PUSHBUTTON"),BS_DEFPUSHBUTTON,TEXT("DEFPUSHBUTTON"),BS_CHECKBOX,TEXT("CHECKBOX"),BS_AUTOCHECKBOX,TEXT("AUTOCHECKBOX"),BS_RADIOBUTTON,TEXT("RADIOBUTTON"),BS_3STATE,TEXT("3STATE"),BS_AUTO3STATE,TEXT("AUTO3STATE"),BS_GROUPBOX,TEXT("GROUPBOX"),BS_OWNERDRAW,TEXT("OWNERDRAW")};#define NUM (sizeof(button)/sizeof(button[0]))LRESULT CALLBACK WindowProc(  HWND hwnd,      // handle to window  UINT uMsg,      // message identifier  WPARAM wParam,  // first message parameter  LPARAM lParam   // second message parameter);int WINAPI WinMain(  HINSTANCE hInstance,      // handle to current instance  HINSTANCE hPrevInstance,  // handle to previous instance  LPSTR lpCmdLine,          // command line  int nCmdShow              // show state){static TCHAR szAppName[]=TEXT("leidemingzi");HWND hwnd;MSG msg;WNDCLASS wndclass;wndclass.cbClsExtra=0;wndclass.cbWndExtra=0;wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);wndclass.hInstance=hInstance;wndclass.lpfnWndProc=WindowProc;wndclass.lpszClassName=szAppName;wndclass.lpszMenuName=NULL;wndclass.style=CS_HREDRAW|CS_VREDRAW;if(!RegisterClass(&wndclass)){MessageBox(NULL,TEXT("the program require window nt"),TEXT("TIPS"),MB_ICONERROR);return 0;}hwnd=CreateWindow(  szAppName,  // registered class name  TEXT("this is title"), // window name  WS_OVERLAPPEDWINDOW,        // window style  CW_USEDEFAULT,                // horizontal position of window   CW_USEDEFAULT,                // vertical position of window   CW_USEDEFAULT,           // window width   CW_USEDEFAULT,          // window height NULL,      // handle to parent or owner window  NULL,          // menu handle or child identifier  hInstance,  // handle to application instanceNULL        // window-creation data);ShowWindow(hwnd,nCmdShow);UpdateWindow(hwnd);while(GetMessage(&msg,NULL,0,0)){TranslateMessage(&msg);DispatchMessage(&msg);}return msg.wParam;}LRESULT CALLBACK WindowProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam){     static HWND  hwndButton[NUM] ;     static RECT  rect ;     static TCHAR szTop[]    = TEXT ("message            wParam       lParam"),                  szUnd[]    = TEXT ("_______            ______       ______"),                  szFormat[] = TEXT ("%-16s%04X-%04X    %04X-%04X"),                  szBuffer[50] ;     static int   cxChar, cyChar ;     HDC          hdc ;     PAINTSTRUCT  ps ;     int          i ;          switch (message)     {     case WM_CREATE :          cxChar = LOWORD (GetDialogBaseUnits ()) ;          cyChar = HIWORD (GetDialogBaseUnits ()) ;                    for (i = 0 ; i < NUM ; i++)               hwndButton[i] = CreateWindow ( TEXT("button"),                                    button[i].szText,                                   WS_CHILD | WS_VISIBLE | button[i].iStyle,                                   cxChar, cyChar * (1 + 2 * i),                                   20 * cxChar, 7 * cyChar / 4,                                   hwnd, (HMENU) i,                                   ((LPCREATESTRUCT) lParam)->hInstance, NULL) ;          return 0 ;     case WM_SIZE :          rect.left   = 24 * cxChar ;          rect.top    =  2 * cyChar ;          rect.right  = LOWORD (lParam) ;          rect.bottom = HIWORD (lParam) ;          return 0 ;               case WM_PAINT :          InvalidateRect (hwnd, &rect, TRUE) ;                    hdc = BeginPaint (hwnd, &ps) ;          SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;          SetBkMode (hdc, TRANSPARENT) ;                    TextOut (hdc, 24 * cxChar, cyChar, szTop, lstrlen (szTop)) ;          TextOut (hdc, 24 * cxChar, cyChar, szUnd, lstrlen (szUnd)) ;                    EndPaint (hwnd, &ps) ;          return 0 ;               case WM_DRAWITEM :     case WM_COMMAND :          ScrollWindow (hwnd, 0, -cyChar, &rect, &rect) ;                    hdc = GetDC (hwnd) ;          SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT)) ;                    TextOut (hdc, 24 * cxChar, cyChar * (rect.bottom / cyChar - 1),                   szBuffer,                   wsprintf (szBuffer, szFormat,                         message == WM_DRAWITEM ? TEXT ("WM_DRAWITEM") :                                                   TEXT ("WM_COMMAND"),                         HIWORD (wParam), LOWORD (wParam),                         HIWORD (lParam), LOWORD (lParam))) ;                    ReleaseDC (hwnd, hdc) ;          ValidateRect (hwnd, &rect) ;          break ;               case WM_DESTROY :          PostQuitMessage (0) ;          return 0 ;     }     return DefWindowProc (hwnd, message, wParam, lParam) ;}

看看效果图：