位图和位块传输(5)之画图程序

下面是一个很经典的程序，画图程序：可以画图，可以擦掉(来自Windows程序设计第五版)

#include<windows.h>LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter);int WINAPI WinMain(   HINSTANCE hInstance,      // handle to current instance   HINSTANCE hPrevInstance,  // handle to previous instance   LPSTR lpCmdLine,          // command line   int nCmdShow              // show state   ){static TCHAR szAppName[]=TEXT("leidemingzi");HWND hwnd;MSG msg;WNDCLASS wndclass;wndclass.cbClsExtra=0;wndclass.cbWndExtra=0;wndclass.hbrBackground=(HBRUSH)GetStockObject(WHITE_BRUSH);wndclass.hCursor=LoadCursor(NULL,IDC_ARROW);wndclass.hIcon=LoadIcon(NULL,IDI_ERROR);wndclass.hInstance=hInstance;wndclass.lpfnWndProc=WindowProc;wndclass.lpszClassName=szAppName;wndclass.lpszMenuName=NULL;wndclass.style=CS_HREDRAW|CS_VREDRAW;if(!RegisterClass(&wndclass)){MessageBox(NULL,TEXT("the program require the windows nt"),TEXT("tips"),MB_ICONERROR);return 0;}hwnd=CreateWindow(szAppName,  // registered class nameTEXT("this is title"), // window nameWS_OVERLAPPEDWINDOW,        // window styleCW_USEDEFAULT,                // horizontal position of windowCW_USEDEFAULT,                // vertical position of windowCW_USEDEFAULT,           // window widthCW_USEDEFAULT,          // window heightNULL,      // handle to parent or owner windowNULL,          // menu handle or child identifierhInstance,  // handle to application instanceNULL// window-creation data);ShowWindow(hwnd,nCmdShow);UpdateWindow(hwnd);while(GetMessage(&msg,NULL,0,0)){TranslateMessage(&msg);DispatchMessage(&msg);}return msg.wParam;}void GetLargestDisplayMode(int *pcxBitmap,int *pcyBitmap){DEVMODE devmode;int iModeNum=0;*pcxBitmap=*pcyBitmap=0;ZeroMemory(&devmode,sizeof(DEVMODE));devmode.dmSize=sizeof(DEVMODE);while(EnumDisplaySettings(NULL,iModeNum++,&devmode)){*pcxBitmap=max(*pcxBitmap,(int)devmode.dmPelsHeight);*pcyBitmap=max(*pcyBitmap,(int)devmode.dmPelsHeight);}}LRESULT CALLBACK WindowProc(HWND hwnd,      // handle to windowUINT uMsg,      // message identifierWPARAM wParam,  // first message parameterLPARAM lParam   // second message parameter){static BOOL fLeftButtonDown,fRightButtonDown;static HBITMAP hBitmap;static HDC hdcMem;static int cxBitmap,cyBitmap,cxClient,cyClient,xMouse,yMouse;HDC hdc;PAINTSTRUCT ps;switch(uMsg){case WM_CREATE:GetLargestDisplayMode(&cxBitmap,&cyClient);hdc=GetDC(hwnd);hBitmap=(HBITMAP)CreateCompatibleDC(hdc);ReleaseDC(hwnd,hdc);if(!hBitmap){DeleteDC(hdcMem);return -1;}SelectObject(hdcMem,hBitmap);PatBlt(hdcMem,0,0,cxBitmap,cyBitmap,WHITENESS);return 0;case WM_SIZE:cxClient=LOWORD(lParam);cyClient=HIWORD(lParam);return 0;case WM_LBUTTONDOWN:if(!fRightButtonDown){SetCapture(hwnd);}xMouse=LOWORD(lParam);yMouse=HIWORD(lParam);fLeftButtonDown=TRUE;return 0;case WM_LBUTTONUP:if(fLeftButtonDown){SetCapture(NULL);}fLeftButtonDown=FALSE;return 0;case WM_RBUTTONDOWN:if(!fLeftButtonDown){SetCapture(hwnd);}xMouse=LOWORD(lParam);yMouse=HIWORD(lParam);fRightButtonDown=TRUE;return 0;case WM_RBUTTONUP:if(fRightButtonDown){SetCapture(NULL);}fRightButtonDown=FALSE;return 0;case WM_MOUSEMOVE:if(!fLeftButtonDown&&!fRightButtonDown){return 0;}hdc=GetDC(hwnd);SelectObject(hdc,GetStockObject(fLeftButtonDown?BLACK_PEN:WHITE_PEN));SelectObject(hdcMem,GetStockObject(fLeftButtonDown?BLACK_PEN:WHITE_PEN));MoveToEx(hdc,xMouse,yMouse,NULL);MoveToEx(hdcMem,xMouse,yMouse,NULL);xMouse=(short)LOWORD(lParam);yMouse=(short)HIWORD(lParam);LineTo(hdc,xMouse,yMouse);LineTo(hdcMem,xMouse,yMouse);ReleaseDC(hwnd,hdc);return 0;case WM_PAINT:hdc=BeginPaint(hwnd,&ps);BitBlt(hdc,0,0,cxClient,cyClient,hdcMem,0,0,SRCCOPY);EndPaint(hwnd,&ps);return 0;case WM_DESTROY:DeleteDC(hdcMem);DeleteObject(hBitmap);PostQuitMessage(0);return 0;}return DefWindowProc(hwnd,uMsg,wParam,lParam);}

不做过多的解释，自己动手敲敲，有用的。要下载Windows程序设计第五版光盘代码的朋友，可以到我的资源下载。