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：
