XProfan

 $u thread.pcu =thread.
Declare gmx%,gmy%,gmp#,dlg&
windowstyle ( 512 | 8 )
cls
dlg&=createdialog(%hwnd,,100,100,300,300)
Dim     gmp#,8

whilenot %key=2

    thread.start 1,1
    waitinput
    thread.stop 1

wend

dispose gmp#
destroywindow (dlg&)
end

proc thread.do

    parameters n&

    if n&=1

        clear gmp#
        external(user32,ClientToScreen,dlg&,gmp#)
        gmx%=long(gmp#,0)
        gmy%=long(gmp#,4)
        external(user32,GetCursorPos,gmp#)
        gmx%=long(gmp#,0)-gmx%
        gmy%=long(gmp#,4)-gmy%
        locate 1,1
        print gmx%,gmy%,

    endif

endproc

Declare rect#,mousex&,mousey&,fenster&
Dim rect#,16
DEF ScreenToClient(2) ! user32,ScreenToClient
DEF GetCursorPos(1) !USER32,GetCursorPos
Cls
fenster&=@Create(Window,%hwnd,dialog,100,100,240,480)
User Messages $200

While 1

    WaitInput
    Case ((%key=2) or (%key=4)):BREAK

    If fenster&=%MWnd

        GetCursorPos(rect#)
        ScreenToClient(fenster&,rect#)
        mousex&=Long(rect#,0)
        mousey&=Long(rect#,4)
        DrawText 20,20,Str $(Int(mousex&))+, +Str $(Int(mousey&))+

    EndIf

EndWhile

Dispose rect#
End