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].iStyle
X坐标	cxChar
Y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ID
HIWORD(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 instance
	NULL        // 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：