用这个代码画线，每次画都是以坐标0.0为起点。所有办法都试过了
int ii_x,ii_y
ulong l_handle, l_device
strpos pos_zb
ii_x = 1000
ii_y = 1000
pos_zb.xpos=1000
pos_zb.ypos=1000
//SetCapture(handle(This))
l_handle = handle(w_base)
l_device = GetDC(l_handle)
ii_x = unitstopixels(ii_x,XUnitsToPixels!)
ii_y = unitstopixels(ii_y,yUnitsToPixels!)
ulong newPen
newPen = CreatePen(1,2, rgb(255,0,0))
SelectObject(l_device, newPen)
MoveToEx(l_device,ii_x,ii_y,pos_zb)
LineTo(GetDC(handle(w_base)),30,20)
[解决办法]
检查MoveToEx函数是否执行成功
