SDK源码分析 10

  1 #include <windows.h>
  2 
  3 LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
  4 
  5 //定义结构体 一个是 int 一个是字符串 
  6 struct
  7 {
  8     int iStyle;
  9     TCHAR *szText;
 10 }
 11 button[] =
 12 {
 13     BS_PUSHBUTTON, TEXT("PUSHBUTTON"),
 14     BS_DEFPUSHBUTTON, TEXT("DEFPUSHBUTTON"),
 15     BS_CHECKBOX, TEXT("CHECKBOX"),
 16     BS_AUTOCHECKBOX,TEXT("AUTOCHECKBOX"),
 17     BS_RADIOBUTTON,TEXT("RADIOBUTTON"),
 18     BS_3STATE,TEXT("3STATE"),
 19     BS_AUTO3STATE,TEXT("AUTO3STATE"),
 20     BS_GROUPBOX,TEXT("GROUPBOX"),
 21     BS_AUTORADIOBUTTON,TEXT("AUTORADTOBUTTON"),
 22     BS_OWNERDRAW,TEXT("OWNERDRAW")
 23 };
 24 #define NUM (sizeof button / sizeof button[0])//一共有多少个
 25 int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int nCmdShow)
 26 {
 27     WNDCLASS wndclass;
 28     HWND hWnd;
 29     MSG msg;
 30     TCHAR szClassName[] = TEXT("MyClass"), szWindowsName[] = TEXT("MyWindows");
 31 
 32     wndclass.cbClsExtra = 0;
 33     wndclass.cbWndExtra = 0;
 34     wndclass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
 35     wndclass.hCursor = LoadCursor(NULL, IDC_ARROW);
 36     wndclass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
 37     wndclass.hInstance = hInstance;
 38     wndclass.lpfnWndProc = WndProc;
 39     wndclass.lpszClassName = szClassName;
 40     wndclass.lpszMenuName = NULL;
 41     wndclass.style = CS_VREDRAW | CS_HREDRAW;
 42 
 43     if (!RegisterClass(&wndclass))
 44     {
 45         MessageBox(hWnd, TEXT("The Application on Windows NT!"), TEXT("ERROR~"), MB_OK);
 46     }
 47 
 48     hWnd = CreateWindow(szClassName,
 49         szWindowsName,
 50         WS_OVERLAPPEDWINDOW,
 51         CW_USEDEFAULT,
 52         CW_USEDEFAULT,
 53         CW_USEDEFAULT,
 54         CW_USEDEFAULT,
 55         NULL, NULL, hInstance, NULL);
 56     ShowWindow(hWnd, nCmdShow);
 57     UpdateWindow(hWnd);
 58 
 59     while (GetMessage(&msg, NULL, NULL, NULL))
 60     {
 61         TranslateMessage(&msg);
 62         DispatchMessage(&msg);
 63     }
 64     return msg.wParam;
 65 }
 66 
 67 LRESULT CALLBACK WndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
 68 {
 69     static HWND hWndButton[NUM];
 70     static RECT rect;
 71     static TCHAR szTop[] = TEXT("message         wParam    lParam"),
 72         szUnd[] = TEXT("_______         ______    ______"),
 73         szFormat[] = TEXT("%-16s%04X-%04X %04X-%04X"), szBuffer[50];
 74     static int cxChar, cyChar;
 75     int i;
 76     PAINTSTRUCT ps;
 77     HDC hdc;
 78 
 79     switch (msg)
 80     {
 81     case WM_CREATE:
 82         cxChar = LOWORD(GetDialogBaseUnits());//获取字符宽度
 83         cyChar = HIWORD(GetDialogBaseUnits());//获取字符高度  这两个是对话框用的API
 84 
 85         for (i = 0; i < NUM; i++)
 86         {
 87             hWndButton[i] = CreateWindow(TEXT("button"), button[i].szText, WS_CHILD | WS_VISIBLE | button[i].iStyle,
 88                 cxChar, cyChar*(1 + 2 * i), 20 * cxChar, 7 * cyChar / 4, hWnd, (HMENU)i,
 89                 ((LPCREATESTRUCT)lParam)->hInstance, NULL);
 90                 //生成子窗口 句柄保存在hWndButton  
 91                 //lParam其实也可以转换成STRUCT的
 92         }
 93         return 0;
 94     case WM_SIZE:
 95         rect.left = 24 * cxChar;
 96         rect.top = 2 * cyChar;
 97         rect.right = LOWORD(lParam);
 98         rect.bottom = HIWORD(lParam);
 99         //设置 显示文字区域
100         return 0;
101     case WM_PAINT:
102         hdc = BeginPaint(hWnd, &ps);
103 
104         SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT));//设置等宽字体
105         SetBkMode(hdc, TRANSPARENT);//设置透明模式
106         TextOut(hdc, 24 * cxChar, cyChar, szTop, lstrlen(szTop));
107         TextOut(hdc, 24 * cxChar, cyChar, szUnd, lstrlen(szUnd));
108 
109         EndPaint(hWnd, &ps);
110         return 0;
111     case WM_DRAWITEM:
112     case WM_COMMAND:
113         ScrollWindow(hWnd, 0, -cyChar, &rect, &rect);//接收到 命令 就向上 滚动
114         hdc = GetDC(hWnd);
115 
116         SelectObject(hdc, GetStockObject(SYSTEM_FIXED_FONT));
117         TextOut(hdc, 24 * cxChar, cyChar*(rect.bottom / cyChar - 1), szBuffer,
118             wsprintf(szBuffer, szFormat,
119                 msg == WM_DRAWITEM ? TEXT("WM_DRAWITEM") : TEXT("WM_COMMAND"),
120                 HIWORD(wParam), LOWORD(wParam),
121                 HIWORD(lParam), LOWORD(lParam)));
122                 
123                 //输出信息。
124         ReleaseDC(hWnd, hdc);
125         ValidateRect(hWnd, &rect);//使窗口有效 删除 WM_PAINT消息从消息队列里
126         break;
127     case WM_DESTROY:
128         PostQuitMessage(0);
129         return 0;
130     }
131 
132     return DefWindowProc(hWnd, msg, wParam, lParam);
133 }