鼠标点击 小实例P234

#include <windows.h>#define DIVISIONS 5TCHAR   szAppName[]=TEXT("BtnLook");LRESULT CALLBACK WndProc(HWND,UINT,WPARAM,LPARAM);int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,   PSTR szCmdLine,int iCmdShow){//static TCHAR     szAppName[]=TEXT("BtnLook");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("this program requires window it"),       szAppName,MB_ICONERROR);return 0;}hwnd=CreateWindow(szAppName,TEXT("李同的窗口"),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;}LRESULT  CALLBACK WndProc(HWND  hwnd,UINT  message, WPARAM wParam,LPARAM lParam){    static BOOL fState[DIVISIONS][DIVISIONS];static int  cxBlock, cyBlock;HDC     hdc;int     x,y;PAINTSTRUCT  ps;RECT         rect;switch(message){case  WM_SIZE:cxBlock=LOWORD(lParam)/DIVISIONS;cyBlock=HIWORD(lParam)/DIVISIONS;return 0;case WM_LBUTTONDOWN:x=LOWORD(lParam)/cxBlock;y=HIWORD(lParam)/cyBlock;if(x<DIVISIONS&&y<DIVISIONS){fState[x][y]^=1;rect.left=x*cxBlock;rect.top=y*cyBlock;rect.right=(x+1)*cxBlock;rect.bottom=(y+1)*cyBlock;InvalidateRect(hwnd,&rect,FALSE);}elseMessageBeep(0);return 0;case WM_PAINT:hdc=BeginPaint(hwnd,&ps);for(x=0;x<DIVISIONS;x++)for(y=0;y<DIVISIONS;y++){Rectangle(hdc,x*cxBlock,y*cyBlock,(x+1)*cxBlock,(y+1)*cyBlock);if(fState[x][y]){MoveToEx(hdc,x*cxBlock,y*cyBlock,NULL);LineTo(hdc,(x+1)*cxBlock,(y+1)*cyBlock);MoveToEx(hdc,x*cxBlock,(y+1)*cyBlock,NULL);LineTo(hdc,(x+1)*cxBlock,y*cyBlock);}}EndPaint(hwnd,&ps);return 0;case WM_DESTROY:PostQuitMessage(0);return 0;}return DefWindowProc(hwnd,message,wParam,lParam);}

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