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本帖最后由 RSNrsn 于 2014-10-18 20:51 编辑
代码如下:- // Bounce.cpp : Defines the entry point for the application.
- //
- #include "stdafx.h"
- #include "resource.h"
- #define MAX_LOADSTRING 100
- // Global Variables:
- HINSTANCE hInst; // current instance
- TCHAR szTitle[MAX_LOADSTRING]; // The title bar text
- TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text
- // Foward declarations of functions included in this code module:
- ATOM MyRegisterClass(HINSTANCE hInstance);
- BOOL InitInstance(HINSTANCE, int);
- LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
- LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM);
- static int cxClient,cyClient,xCenter,yCenter,xTotal,yTotal,xR,yR,xMove,yMove;
- int APIENTRY WinMain(HINSTANCE hInstance,
- HINSTANCE hPrevInstance,
- LPSTR lpCmdLine,
- int nCmdShow)
- {
- // TODO: Place code here.
- MSG msg;
- HACCEL hAccelTable;
- // Initialize global strings
- LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING);
- LoadString(hInstance, IDC_BOUNCE, szWindowClass, MAX_LOADSTRING);
- MyRegisterClass(hInstance);
- // Perform application initialization:
- if (!InitInstance (hInstance, nCmdShow))
- {
- return FALSE;
- }
- hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_BOUNCE);
- // Main message loop:
- while (GetMessage(&msg, NULL, 0, 0))
- {
- if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg))
- {
- TranslateMessage(&msg);
- DispatchMessage(&msg);
- }
- }
- return msg.wParam;
- }
- //
- // FUNCTION: MyRegisterClass()
- //
- // PURPOSE: Registers the window class.
- //
- // COMMENTS:
- //
- // This function and its usage is 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)WndProc;
- wcex.cbClsExtra = 0;
- wcex.cbWndExtra = 0;
- wcex.hInstance = hInstance;
- wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_BOUNCE);
- wcex.hCursor = LoadCursor(NULL, IDC_ARROW);
- wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
- wcex.lpszMenuName = (LPCSTR)IDC_BOUNCE;
- wcex.lpszClassName = szWindowClass;
- wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL);
- return RegisterClassEx(&wcex);
- }
- //
- // FUNCTION: InitInstance(HANDLE, 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, unsigned, WORD, LONG)
- //
- // 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;
- PAINTSTRUCT ps;
- HDC hdc,hdcMem;
- static int i=0;
- static HBITMAP bitmap;
- HBRUSH brush;
- switch (message)
- {
- case WM_CREATE:
- SetTimer(hWnd,1,100,NULL);
- break;
- case WM_SIZE:
-
- xCenter = (cxClient = LOWORD(lParam))/2;
- yCenter = (cyClient = HIWORD(lParam))/2;
- xR = 20;
- yR = 20;
- xMove = xR/2;
- yMove = yR/2;
- xTotal = 2*(xR + xMove);
- yTotal = 2*(yR + yMove);
- hdc = GetDC(hWnd);
- bitmap = CreateCompatibleBitmap(hdc,xTotal,yTotal);
- hdcMem = CreateCompatibleDC(NULL);
- ReleaseDC(hWnd,hdc);
- SelectObject(hdcMem,bitmap);
- Rectangle( hdcMem,-1,-1,xTotal+1,yTotal+1);
- brush = CreateHatchBrush(HS_DIAGCROSS,0L);
- SelectObject(hdcMem,brush);
- SetBkColor(hdcMem, RGB(255,0,255));
- Ellipse(hdcMem,xMove,yMove,xTotal-xMove,yTotal-yMove);
- DeleteObject(hdcMem);
-
- break;
- case WM_COMMAND:
- wmId = LOWORD(wParam);
- wmEvent = HIWORD(wParam);
- // Parse the menu selections:
- switch (wmId)
- {
- case IDM_ABOUT:
- DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About);
- break;
- case IDM_EXIT:
- DestroyWindow(hWnd);
- break;
- default:
- return DefWindowProc(hWnd, message, wParam, lParam);
- }
- break;
- case WM_TIMER:
- hdc = GetDC(hWnd);
- if(!bitmap)
- break;
- hdcMem = CreateCompatibleDC(hdc);
- SelectObject(hdcMem, bitmap);
- BitBlt(hdc, xCenter - xTotal / 2, yCenter - yTotal / 2, xTotal, yTotal,
- hdcMem, 0,0,SRCCOPY);
-
- xCenter += xMove;
- yCenter += yMove;
- if (((xCenter+xR/2) >= cxClient)||((xCenter-xR/2) <= 0))
- {
- xMove = -xMove;
- }
- if ((yCenter+yR/2 >=cyClient)||(yCenter-yR/2 <= 0))
- {
- yMove = -yMove;
- }
- //这行代码删掉就不行为啥呢?
- DeleteObject(hdcMem);
- ReleaseDC(hWnd,hdc);
- break;
- case WM_PAINT:
- hdc = BeginPaint(hWnd, &ps);
- // TODO: Add any drawing code here...
-
- EndPaint(hWnd, &ps);
- break;
- case WM_DESTROY:
- PostQuitMessage(0);
- break;
- default:
- return DefWindowProc(hWnd, message, wParam, lParam);
- }
- return 0;
- }
- // Mesage handler for about box.
- LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
- {
- switch (message)
- {
- case WM_INITDIALOG:
- return TRUE;
- case WM_COMMAND:
- if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL)
- {
- EndDialog(hDlg, LOWORD(wParam));
- return TRUE;
- }
- break;
- }
- return FALSE;
- }
复制代码
为啥注释这一行就运行不出效果。
如图C:\Users\Administrator\Desktop |
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