WINDOWPLACEMENT wp; RECT rect; GetDlgItem(IDC_SLIDER)-> GetWindowPlacement(&wp); //client坐标系 rect=wp.rcNormalPosition; if(point.x> rect.left && point.x < rect.right && point.y> rect.top && point.y <rect.bottom) { MessageBox(_T("yeah")); } //另,仍可以用另一种方法 CRect rect GetDlgItem(IDC_SLIDER)-> GetwindowRect(&rect); //screen坐标系 ScreenToClient(&rect); if(point.x> rect.left&&point.x <rect.right&&point.y <rect.bottom&&point.y> rect.top) { //... }