下面我们将通过叫做BTNLOOK（「button look」）的程序来开始介绍按钮窗口类别，如程序9-1所示。BTNLOOK建立10个子窗口按钮控件，每个控件对应一个标准的按钮样式，因此共有10种标准按钮样式。
程序9-1 BTNLOOK
BTNLOOK.C /*-------------------------------------------------------------------------- BTNLOOK.C -- Button Look Program (c) Charles Petzold, 1998 ---------------------------------------------------------------------------*/ #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_AUTORADIOBUTTON, TEXT ("AUTORADIO"), BS_OWNERDRAW, TEXT ("OWNERDRAW") } ; #define NUM (sizeof button / sizeof button[0]) LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ; int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow) { static TCHAR szAppName[] = TEXT ("BtnLook") ; HWND hwnd ; MSG msg ; WNDCLASS wndclass ; wndclass.style = CS_HREDRAW | CS_VREDRAW ; wndclass.lpfnWndProc = WndProc ; wndclass.cbClsExtra = 0 ; wndclass.cbWndExtra = 0 ; wndclass.hInstance = hInstance ; wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION) ; wndclass.hCursor = LoadCursor (NULL, IDC_ARROW) ; wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH) ; wndclass.lpszMenuName = NULL ; wndclass.lpszClassName = szAppName ; if (!RegisterClass (&wndclass)) { MessageBox ( NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR) ; return 0 ; } hwnd = CreateWindow (szAppName, TEXT ("Button Look"), 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 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) ; }