C语言Windows程序开发—CreateWindow函数介绍【第03天】

1 /*创建Login窗口*/
2 #include <windows.h>
3 #include <stdio.h>
4 
5 #define         ID_UserName         1000
6 #define         ID_Password         1001
7 #define            ID_btnLogin            1002
8 
9 /*声明回调函数 */
10 LRESULT CALLBACK WndProc ( HWND, UINT, WPARAM, LPARAM ) ;
11 
12 /*声明创建窗口控件 */
13 int CreateChildWindow ( HWND, HWND *, LPARAM ) ;
14 
15 /*主函数 */
16 int WINAPI WinMain ( HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, intiCmdShow )
17 {
18     static TCHAR    szAppName [] = TEXT ("Demo") ;
19 HWND            hwnd ;
20 MSG             msg ;
21 WNDCLASS        wndclass ;
22 
23     wndclass.style              = CS_HREDRAW | CS_VREDRAW ;                        //窗口样式
24     wndclass.lpfnWndProc        = WndProc ;                                        //窗口的回调函数
25     wndclass.hInstance          = hInstance ;                                    //窗口实例句柄
26     wndclass.cbClsExtra         = 0 ;                                            //窗口结构体扩展：无
27     wndclass.cbWndExtra         = 0 ;                                            //窗口实例扩展：无
28     wndclass.hbrBackground      = ( HBRUSH ) GetStockObject ( WHITE_BRUSH ) ;   //窗口背景
29     wndclass.hIcon              = LoadIcon ( NULL, IDI_APPLICATION ) ;            //窗口图标
30     wndclass.hCursor            = LoadCursor ( NULL, IDC_ARROW ) ;                //窗口中的鼠标样式
31     wndclass.lpszClassName      = szAppName ;                                    //窗口结构体名称
32     wndclass.lpszMenuName       = NULL ;                                        //主菜单名称：无
33 
34     /*注册窗口结构体 */
35     if ( !RegisterClass ( &wndclass ) )
36 {
37         MessageBox ( NULL, TEXT ("无法注册窗口结构体！"), TEXT ("错误"), MB_OK |MB_ICONERROR) ;
38         return 0;
39 }
40 
41     /*创建Login窗口 */
42     hwnd = CreateWindow (   szAppName, TEXT ("登录"),
43 WS_OVERLAPPEDWINDOW,
44 CW_USEDEFAULT, CW_USEDEFAULT,
45                             400, 300,
46 NULL, NULL, hInstance, NULL ) ;
47 
48     /*显示与更新窗口 */
49 ShowWindow ( hwnd, iCmdShow ) ;
50 UpdateWindow ( hwnd ) ;
51 
52     /*从消息队列中获取消息 */
53     while ( GetMessage ( &msg, NULL, 0, 0) )
54 {
55         TranslateMessage ( &msg ) ;     //将虚拟键消息转换为字符消息
56         DispatchMessage ( &msg ) ;      //将消息传递给回调函数处理
57 }
58 
59     returnmsg.wParam ;
60 }
61 
62 /*回调函数 */
63 LRESULT CALLBACK WndProc (HWND hwnd, UINT umsg, WPARAM wParam, LPARAM lParam )
64 {
65     static HWND     hChild [2] ;
66 HDC             hdc ;
67 PAINTSTRUCT     ps ;
68 RECT            rect ;
69     
70     static intcxChar, cyChar ;
71 
72     switch( umsg )
73 {
74     case WM_CREATE :            //处理窗口创建成功后发来的消息
75         /*创建窗口控件 */
76 CreateChildWindow ( hwnd, hChild, lParam ) ;       
77         
78         cxChar = LOWORD (GetDialogBaseUnits ());    //获得窗口中内定字体字元宽度（低字组）
79         cyChar = HIWORD (GetDialogBaseUnits ());    //或得窗口中内定字体字元高度（高字组）
80         return 0;
81         
82     case WM_SIZE :              //处理窗口尺寸发生改变后发来的消息
83         GetClientRect ( hwnd, &rect ) ;
84         MoveWindow ( hChild [ ID_UserName ], rect.left + cxChar * 12, 110, cxChar * 24,  cyChar * 5 / 4, TRUE ) ;
85         MoveWindow ( hChild [ ID_Password ], rect.left + cxChar * 12, 160, cxChar * 24,  cyChar * 5 / 4, TRUE ) ;
86         MoveWindow ( hChild [ ID_btnLogin ], rect.left + cxChar * 12, 210, cxChar * 12,  cyChar * 7 / 4, TRUE ) ;
87         return 0;
88 
89     case WM_PAINT :             //处理窗口产生无效区域时发来的消息
90         GetClientRect ( hwnd, &rect ) ;
91         hdc =  BeginPaint ( hwnd, &ps ) ;
92         TextOut ( hdc, rect.left + cxChar * 12,  95, TEXT ("UserName:"), lstrlen ( TEXT ("UserName:") ) ) ;
93         TextOut ( hdc, rect.left + cxChar * 12, 145, TEXT ("Password:"), lstrlen ( TEXT ("Password:") ) ) ;
94         EndPaint ( hwnd, &ps ) ;
95         return 0;
96 
97     case WM_DESTROY :           //处理窗口关闭时发来的消息
98         PostQuitMessage (0) ;
99         return 0;
100 }
101 
102     returnDefWindowProc ( hwnd, umsg, wParam, lParam ) ;
103 }
104 
105 /*创建控件 */
106 int CreateChildWindow ( HWND hwnd, HWND *hChild, LPARAM lParam )
107 {
108     HINSTANCE hInst = ( ( LPCREATESTRUCT ) lParam ) ->hInstance ;
109     
110     /*创建UserName文本框 */
111     hChild [ ID_UserName ] = CreateWindow ( TEXT ("edit"), NULL, 
112                             WS_CHILD | WS_VISIBLE | WS_BORDER |ES_LEFT,
113                             0, 0, 0 , 0,
114 hwnd, ( HMENU ) ID_UserName, hInst, NULL ) ;
115     
116     /*创建Password文本框 */
117     hChild [ ID_Password ] = CreateWindow ( TEXT ("edit"), NULL,
118                             WS_CHILD | WS_VISIBLE | WS_BORDER |ES_LEFT,
119                             0, 0, 0, 0,
120 hwnd, ( HMENU ) ID_Password, hInst, NULL ) ;
121     
122     /*创建Login按钮 */
123     hChild [ ID_btnLogin ] = CreateWindow ( TEXT ("button"), TEXT ("Login"),
124                             WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON |BS_CENTER,
125                             0, 0, 0, 0,
126 hwnd, ( HMENU ) ID_btnLogin, hInst, NULL ) ;
127 
128     return 0;
129 }