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ClipCurSor 

.Confines the cursor to a rectangular area on the screen

Parameters

lpRect

Type: const RECT*

A pointer to the structure that contains the screen coordinates of the upper-left and lower-right corners of the confining rectangle. If this parameter is NULL, 

.the cursor is free to move anywhere on the screen

rectangle

setrect

createpen

clienttoscreen

ptinrect

stretchblt

Dim ptClientUL As POINTAPI  'client area upper lef corner 

Dim ptClientLR As POINTAPI 'client area lower right corner 

Static rcBmp As RECT 

WM_CREATE

(hdc=GetDC(hwnd

(hdcCompat=CreateCompatibleDC(hdc

SelectObject hdcCompat, hbmp

((hpenDot=CreatePen(PS_DOT,1,RGB(0, 0, 0

SetRect rcBmp, 1, 1, 34, 34

WM_PAINT

BeginPaint hwnd,ps

Rectangle ps.hdc,rcBmp.left,rcBmp.top,rcBmp.right, rcBmp.bottom

StretchBlt ps.hdc,rcBmp.left+1,rcBmp.top+1,(rcBmp.right-rcBmp.left)-2,(rcBmp.bottom-rcBmp.top)-2, hdcCompat,0,0,32,32,SRCCOPY

EndPaint hwnd,ps

WM_MOVE,WM_SIZE

'Convert the client coordinates of the client-area rectangle to screen coordinates and save them in a rectangle.The rectangle is passed to the ClipCursor function during WM_LBUTTONDOWN processing. 

GetClientRect hwnd,rcClient

ptClientUL.x = rcClient.left

ptClientUL.y = rcClient.top

ptClientLR.x = rcClient.right

ptClientLR.y = rcClient.bottom ClientToScreen hwnd,ptClientUL ClientToScreen hwnd,ptClientLR

SetRect rcClient,ptClientUL.x, ptClientUL.y,ptClientLR.x,ptClientLR.y)

WM_LBUTTONDOWN

ClipCursor rcClient

pt.x = (LONG) LOWORD(lParam) 

pt.y = (LONG) HIWORD(lParam)

if (PtInRect(&rcBmp, pt)) Then 

hdc=GetDC(hwnd)

SelectObject hdc,hpenDot

Rectangle hdc,rcBmp.left,rcBmp.top, rcBmp.right,rcBmp.bottom)

fDragRect=TRUE

ReleaseDC hwnd,hdc

WM_LBUTTONUP

' Release the mouse cursor.

ClipCursor  0