按下鼠标时，记录下鼠标在窗体上的坐标， 同时用一个BOOL变量记录下鼠标左键按下的状态

弹起左键，则记录状态的布尔变量为FALSE.

处理鼠标移动事件，如果左键同时按下，则为鼠标拖动窗体运动，设置窗体新的左上角坐标。

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·········10········20········30········40········50········60········70········80········90········100·······110·······120·······130·······140·······15001.void CNoBorderFormDlg::OnMouseMove(UINT nFlags, CPoint point) 
{ 
    // TODO: 在此添加消息处理程序代码和/或调用默认值 
 
    CDialog::OnMouseMove(nFlags, point); 
    if (this->_leftButtonDown) 
    { 
       /// 鼠标左键按下时，可以拖动窗体 
        CPoint pointChanged = point - (this->_mousePoint); 
        RECT rect; 
        this->GetWindowRect(&rect); 
        this->SetWindowPos(NULL, rect.left pointChanged.x, rect.top pointChanged.y, 0, 0, SWP_NOSIZE); 
    } 
} 

void CNoBorderFormDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{ 
    // TODO: 在此添加消息处理程序代码和/或调用默认值 

    CDialog::OnLButtonDown(nFlags, point); 
    this->_leftButtonDown = TRUE; 
    this->_mousePoint = CPoint(point); 
} 
 
void CNoBorderFormDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{ 
   // TODO: 在此添加消息处理程序代码和/或调用默认值 
 
    CDialog::OnLButtonUp(nFlags, point); 
    this->_leftButtonDown = FALSE; 
} 
 
void CNoBorderFormDlg::OnMouseLeave() 
{ 
    // TODO: 在此添加消息处理程序代码和/或调用默认值 
    CDialog::OnMouseLeave(); 
    this->_leftButtonDown = FALSE; 
}

C++ 无边框的拖动窗口代码