第一个VC++ win32程序 绘制简单图形
创建一个VC++ win32
打开VS 新工程类型中选择Win32----Win32 Project 自己取个名字（假如叫做My1stWin） 一路next
系统会自动生成好最基本的代码 然后我们就在上面改就可以了
发现编译不通过？ 不要使用Ctrl+F7 来编译 而应该使用Ctrl+Alt+F7
下面是主程序My1stWin.cpp
// My1stWin.cpp : Defines the entry point for the application. // #include "stdafx.h" #include "My1stWin.h" #define MAX_LOADSTRING 100 // Global Variables: HINSTANCE hInst; // current instance TCHAR szTitle[MAX_LOADSTRING]; // The title bar text TCHAR szWindowClass[MAX_LOADSTRING]; // the main window class name // Forward declarations of functions included in this code module: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); INT_PTR CALLBACK About(HWND, UINT, WPARAM, LPARAM); /* _tWinMain是系统生成的 */ int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) { UNREFERENCED_PARAMETER(hPrevInstance); UNREFERENCED_PARAMETER(lpCmdLine); // TODO: Place code here. MSG msg; HACCEL hAccelTable; // Initialize global strings LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hInstance, IDC_MY1STWIN, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // Perform application initialization: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_MY1STWIN)); // Main message loop: while (GetMessage(&msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return (int) msg.wParam; } /*网上找的winMain 更直观 可以设置窗口的属性什么的 二者都可以*/ //int WINAPI WinMain(HINSTANCE hInstance, // HINSTANCE hPrevInstance, // PSTR szCmdLine, // int iCmdShow) { // static TCHAR szAppName[] = TEXT("draw"); // 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("Register failure..."), // szAppName, MB_ICONERROR); // return 0; // } // hwnd = CreateWindow(szAppName, // szAppName, // 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; //} // // FUNCTION: MyRegisterClass() // // PURPOSE: Registers the window class. // // COMMENTS: // // This function and its usage are only necessary if you want this code // to be compatible with Win32 systems prior to the 'RegisterClassEx' // function that was added to Windows 95. It is important to call this function // so that the application will get 'well formed' small icons associated // with it. // ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_MY1STWIN)); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = MAKEINTRESOURCE(IDC_MY1STWIN); wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, MAKEINTRESOURCE(IDI_SMALL)); return RegisterClassEx(&wcex); } // // FUNCTION: InitInstance(HINSTANCE, int) // // PURPOSE: Saves instance handle and creates main window // // COMMENTS: // // In this function, we save the instance handle in a global variable and // create and display the main program window. // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } // // FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM) // // PURPOSE: Processes messages for the main window. // // WM_COMMAND - process the application menu // WM_PAINT - Paint the main window // WM_DESTROY - post a quit message and return // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; static int cxClient, cyClient; PAINTSTRUCT ps; HDC hdc; //hWnd是窗口句柄，其中包含窗口的属性。例如，窗口的大小，显示位置，父窗口。 //hDC(Handle to Device Context)是图像的设备描述表，窗口显示上下文句柄，其中可以进行图形显示。 //利用hDC=GetDC(hWnd)，可以获得一个窗口的图形设备描述表。可以通过ReleaseDC()函数释放。 //rakus code================== HPEN hPen, hPenOld;//定义画笔 HBRUSH hBrush,HBruOld;//定义画刷 TEXTMETRIC tm;//用于获取字体信息 int x=10; int y=150; //end of rakus code===================== switch (message) { case WM_CREATE: return 0; case WM_SIZE: cxClient = LOWORD(lParam); cyClient = HIWORD(lParam); return 0; case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_ABOUT: DialogBox(hInst, MAKEINTRESOURCE(IDD_ABOUTBOX), hWnd, About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_PAINT: hdc = BeginPaint(hWnd, &ps); // TODO: Add any drawing code here... //this is rakus code //划横线 MoveToEx(hdc, 0, cyClient / 2, NULL); LineTo(hdc, cxClient, cyClient / 2); // 画竖线 MoveToEx(hdc, cxClient / 2, 0, NULL); LineTo(hdc, cxClient / 2, cyClient); // 画椭圆 Ellipse(hdc, cxClient / 2, 0, cxClient, cyClient / 2); // 画圆矩形 RoundRect(hdc, cxClient / 8, 5 * cyClient / 8, cxClient / 2 - cxClient / 8, cyClient - cyClient / 8, cxClient / 16, cyClient / 16); // 画弦 Chord(hdc, cxClient / 2, cyClient / 2, 3 * cxClient / 2, 3* cyClient / 2, cxClient, cyClient / 2, cxClient / 2, cyClient); hPen=(HPEN)CreatePen(PS_SOLID,3,RGB(0,50,220));//创建画笔 宽度为3 蓝色 hBrush=(HBRUSH)CreateHatchBrush(HS_CROSS,RGB(220,50,0));//创建网格线画刷 红色 //GetClientRect(hWnd,&rect);//rect无法解析 当然了 前面根本没有定义rect Rectangle(hdc,10,10,80,80);//虽然上面创建了自己的画笔 但是这里并没有用自己的画笔 hPenOld=(HPEN)SelectObject(hdc,hPen);//选择新画笔 返回旧画笔的句柄 HBruOld=(HBRUSH)SelectObject(hdc,hBrush);//选择新画刷 返回旧画刷句柄 //画刷就是用来画底色的 Rectangle(hdc,100,10,180,580); Ellipse(hdc,250,10,350,80);//画椭圆//这里绘制的两个就是使用新画刷和新画笔 SelectObject(hdc,hBrush);//选择默认画笔 //end of rakus code EndPaint(hWnd, &ps); break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // Message handler for about box. INT_PTR CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { UNREFERENCED_PARAMETER(lParam); switch (message) { case WM_INITDIALOG: return (INT_PTR)TRUE; case WM_COMMAND: if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) { EndDialog(hDlg, LOWORD(wParam)); return (INT_PTR)TRUE; } break; } return (INT_PTR)FALSE; }
