//創建實心畫筆，粗度為1，顏色為綠色 newPen.CreatePen(PS_SOLID, 1, RGB(0, 255, 0)); //選擇新畫筆，并將舊畫筆的指針保存到pOldPen pOldPen = pDC->SelectObject(&newPen); //畫直角坐標 pDC->MoveTo(rectPicture.left, rectPicture.top + (rectPicture.Height() / 2)); pDC->LineTo(rectPicture.right, rectPicture.top + (rectPicture.Height() / 2)); pDC->MoveTo(rectPicture.left + (rectPicture.Width() / 2), rectPicture.top); pDC->LineTo(rectPicture.left + (rectPicture.Width() / 2), rectPicture.bottom); // 恢復舊畫筆 pDC->SelectObject(pOldPen); // 刪除坐標畫筆 newPen.DeleteObject(); //創建實心畫筆，粗度為1，顏色為綠色 newPen.CreatePen(PS_SOLID, 1, RGB(0, 255, 0)); //選擇新畫筆，并將舊畫筆的指針保存到pOldPen pOldPen = pDC->SelectObject(&newPen); //畫直角坐標 pDC->MoveTo(rectPicture.left, rectPicture.top + (rectPicture.Height() / 2)); pDC->LineTo(rectPicture.right, rectPicture.top + (rectPicture.Height() / 2)); pDC->MoveTo(rectPicture.left + (rectPicture.Width() / 2), rectPicture.top); pDC->LineTo(rectPicture.left + (rectPicture.Width() / 2), rectPicture.bottom); // 恢復舊畫筆 pDC->SelectObject(pOldPen); // 刪除坐標畫筆 newPen.DeleteObject(); --------------------- 原文：https://blog.csdn.net/lijiayu2015/article/details/52885475