1 // 01WM_PAINT与GetDC.cpp : 定义应用程序的入口点。  2 //  3   4 #include "stdafx.h"  5 #include "01WM_PAINT与GetDC.h"  6   7 #define MAX_LOADSTRING 100  8   9 #define MYBUTTON1  10001 10  11 #define MYBUTTON2  10002 12  13 #define MYBUTTON3  10003 14 // 全局变量:  15 HINSTANCE hInst;                                // 当前实例 16 TCHAR szTitle[MAX_LOADSTRING];                    // 标题栏文本 17 TCHAR szWindowClass[MAX_LOADSTRING];            // 主窗口类名 18  19 // 此代码模块中包含的函数的前向声明:  20 ATOM                MyRegisterClass(HINSTANCE hInstance); 21 BOOL                InitInstance(HINSTANCE, int); 22 LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM); 23 INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM); 24  25 int APIENTRY _tWinMain(_In_ HINSTANCE hInstance, 26                      _In_opt_ HINSTANCE hPrevInstance, 27                      _In_ LPTSTR    lpCmdLine, 28                      _In_ int       nCmdShow) 29 { 30     UNREFERENCED_PARAMETER(hPrevInstance); 31     UNREFERENCED_PARAMETER(lpCmdLine); 32  33      // TODO:  在此放置代码。 34     MSG msg; 35     HACCEL hAccelTable; 36  37     // 初始化全局字符串 38     LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); 39     LoadString(hInstance, IDC_MY01WM_PAINTGETDC, szWindowClass, MAX_LOADSTRING); 40     MyRegisterClass(hInstance); 41  42     // 执行应用程序初始化:  43     if (!InitInstance (hInstance, nCmdShow)) 44     { 45         return FALSE; 46     } 47  48     hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MY01WM_PAINTGETDC)); 49  50     // 主消息循环:  51     while (GetMessage(&msg, NULL, 0, 0)) 52     { 53         if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 54         { 55             TranslateMessage(&msg); 56             DispatchMessage(&msg); 57         } 58     } 59  60     return (int) msg.wParam; 61 } 62  63  64  65 // 66 //  函数:  MyRegisterClass() 67 // 68 //  目的:  注册窗口类。 69 // 70 ATOM MyRegisterClass(HINSTANCE hInstance) 71 { 72     WNDCLASSEX wcex; 73  74     wcex.cbSize = sizeof(WNDCLASSEX); 75  76     wcex.style            = CS_HREDRAW | CS_VREDRAW; 77     wcex.lpfnWndProc    = WndProc; 78     wcex.cbClsExtra        = 0; 79     wcex.cbWndExtra        = 0; 80     wcex.hInstance        = hInstance; 81     wcex.hIcon            = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MY01WM_PAINTGETDC)); 82     wcex.hCursor        = LoadCursor(NULL, IDC_ARROW); 83     wcex.hbrBackground    = (HBRUSH)(COLOR_WINDOW+1); 84     wcex.lpszMenuName    = MAKEINTRESOURCE(IDC_MY01WM_PAINTGETDC); 85     wcex.lpszClassName    = szWindowClass; 86     wcex.hIconSm        = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); 87  88     return RegisterClassEx(&wcex); 89 } 90  91 // 92 //   函数:  InitInstance(HINSTANCE, int) 93 // 94 //   目的:  保存实例句柄并创建主窗口 95 // 96 //   注释:  97 // 98 //        在此函数中，我们在全局变量中保存实例句柄并 99 //        创建和显示主程序窗口。100 //101 BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)102 {103    HWND hWnd;104 105    hInst = hInstance; // 将实例句柄存储在全局变量中106 107    hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW,108       CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL);109 110    if (!hWnd)111    {112       return FALSE;113    }114 115    ShowWindow(hWnd, nCmdShow);116    UpdateWindow(hWnd);117 118    return TRUE;119 }120 121 //122 //  函数:  WndProc(HWND, UINT, WPARAM, LPARAM)123 //124 //  目的:    处理主窗口的消息。125 //126 //  WM_COMMAND    - 处理应用程序菜单127 //  WM_PAINT    - 绘制主窗口128 //  WM_DESTROY    - 发送退出消息并返回129 //130 //131 LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)132 {133     int wmId, wmEvent;134     PAINTSTRUCT ps;135     HDC hdc;136     static int nNum = 10;137     switch (message)138     {139     case  WM_CREATE:140         //创建按钮用于GetDC()141         CreateWindow(142             TEXT("button"),143             TEXT("hehe"),144             WS_VISIBLE | WS_CHILD,145             50, 50, 60, 30, hWnd,146             (HMENU)MYBUTTON1,147             hInst,148             NULL);149         //创建按钮用于GetWindowDC()150         CreateWindow(151             TEXT("button"),152             TEXT("hehe"),153             WS_VISIBLE | WS_CHILD,154             120, 50, 60, 30, hWnd,155             (HMENU)MYBUTTON2,156             hInst,157             NULL);158         CreateWindow(159             TEXT("button"),160             TEXT("hehe"),161             WS_VISIBLE | WS_CHILD,162             190, 50, 60, 30, hWnd,163             (HMENU)MYBUTTON3,164             hInst,165             NULL);166 167     case WM_COMMAND:168         wmId    = LOWORD(wParam);169         wmEvent = HIWORD(wParam);170         // 分析菜单选择: 171         switch (wmId)172         {173         case  MYBUTTON1:174         {175             HDC hDc = GetDC(NULL);176             TextOut(hDc, 0, 0, TEXT("15PB"), 4);177             ReleaseDC(hWnd, hDc);178         }179             break;180         case MYBUTTON2:181         {182             HDC hDc = GetWindowDC(hWnd);183             TextOut(hDc, 0, 20, TEXT("15PB"), 4);184         }185             break;186         case  MYBUTTON3:187         {188             HDC hDc = CreateDC(TEXT("DISPLAY"), NULL, NULL, NULL);189             TextOut(hDc, 100, 100, TEXT("15PB"), 4);190         }191         default:192             return DefWindowProc(hWnd, message, wParam, lParam);193         }194         break;195     case WM_PAINT:196     {197         hdc = BeginPaint(hWnd, &ps);198         // TODO:  在此添加任意绘图代码...199         //用以验证有效区域和无效区域200         nNum++;201         TCHAR buf[20] = {};202         _stprintf_s(buf, 20, TEXT("%d"), nNum);203         TextOut(hdc, 100, 100, buf, _tcsclen(buf));204         EndPaint(hWnd, &ps);205         break;206     }207     case WM_NCPAINT:208     {209 //         HDC hdc;210 //         hdc = GetDCEx(hWnd, (HRGN)wParam, DCX_WINDOW | DCX_INTERSECTRGN);211 //         TextOut(hdc, 0, 0, TEXT("15PB"), 4);212 //         ReleaseDC(hWnd, hdc);213         return DefWindowProc(hWnd, message, wParam, lParam);214         break;215     }216     case WM_DESTROY:217         PostQuitMessage(0);218         break;219     default:220         return DefWindowProc(hWnd, message, wParam, lParam);221     }222     return 0;223 }224 225 // “关于”框的消息处理程序。226 INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)227 {228     UNREFERENCED_PARAMETER(lParam);229     switch (message)230     {231     case WM_INITDIALOG:232         return (INT_PTR)TRUE;233 234     case WM_COMMAND:235         if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)236         {237             EndDialog(hDlg, LOWORD(wParam));238             return (INT_PTR)TRUE;239         }240         break;241     }242     return (INT_PTR)FALSE;243 }