设计一鼠标应用程序，当按下Ctrl键的同时按下鼠标左键，在窗口中拖动鼠标，可以画一个圆；在按下shift键的同时按下鼠标左键，在窗口中拖动鼠标，可以画一个矩形．
#include<windows.h>
#include<stdlib.h>
#include<string.h>
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam);
BOOL InitWindowsClass(HINSTANCE hInstance);
BOOL InitWindows(HINSTANCE hInstance, int nCmdShow);
HWND hWndMain;
RECT rectl;
int WINAPI WinMain(HINSTANCE hInstance,HINSTANCE hPrevInstance,LPSTR lpCmdLine,int nCmdShow)
{
MSG Message;
if(! InitWindowsClass(hInstance))
return FALSE;
if(! InitWindows(hInstance,nCmdShow))
return FALSE;
while(GetMessage(&Message,0,0,0))
{
TranslateMessage(&Message);
DispatchMessage(&Message);
}
return Message.wParam;
}
long WINAPI WndProc(HWND hWnd,UINT iMessage,UINT wParam,LONG IParam)
{
HDC hDC;
WORD x,y;
HCURSOR hCusor;
static BOOL bCircle=FALSE,bRect=FALSE;
PAINTSTRUCT ps;
x=LOWORD(IParam);
y=HIWORD(IParam);
switch(iMessage)
{
case WM_LBUTTONDOWN:
if(wParam&MK_CONTROL)
{
bCircle=TRUE;
bRect=FALSE;
rectl.left=x;
rectl.top=y;
}
else if(wParam&MK_SHIFT)
{
bRect=TRUE;
bCircle=FALSE;
rectl.left =x;
rectl.top =y;
}
else
{
bRect= FALSE;
bCircle=FALSE;
}
break;
case WM_LBUTTONUP:
bRect=FALSE;
bCircle=FALSE;
break;
case WM_MOUSEMOVE:
rectl.right =x;
rectl.bottom=y;
if(bRect==TRUE||bCircle==TRUE)
{
InvalidateRect(hWnd,NULL,TRUE);
}
break;
case WM_PAINT:
hDC=BeginPaint(hWnd,&ps);
if(bCircle==TRUE)
{
Ellipse(hDC,rectl.left,rectl.top,rectl.right,rectl.bottom);
}
if(bRect ==TRUE)
{
Rectangle(hDC,rectl.left,rectl.top,rectl.right,rectl.bottom);
}
EndPaint(hWnd,&ps);
break;
case WM_DESTROY:
PostQuitMessage(0);
return 0;
default :
return(DefWindowProc(hWnd,iMessage,wParam,IParam));
}
return 0;
}
BOOL InitWindows(HINSTANCE hInstance,int nCmdShow)
{
HWND hWnd;
hWnd=CreateWindow("6-5zz",
"a mouse application programe!",
WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
0,
CW_USEDEFAULT,
0,
NULL,
NULL,
hInstance,
NULL);
if(! hWnd)
return FALSE;
hWndMain=hWnd;
ShowWindow(hWnd,nCmdShow);
UpdateWindow(hWnd);
return TRUE;
}
BOOL InitWindowsClass(HINSTANCE hInstance)
{
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_APPLICATION);
WndClass.hInstance=hInstance;
WndClass.lpfnWndProc =WndProc;
WndClass.lpszClassName ="6-4";
WndClass.lpszMenuName =NULL;
WndClass.style =0;
return RegisterClass(&WndClass);
}
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