实现无边框窗体的拖动及窗体大小变化

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具体阐述如下：

1. 实现WM_NCHITTEST消息，实现四条边框的模拟，参考代码如下：

LRESULT CNoBorderWndChangeSizeDlg::OnNcHitTest(CPoint point)  
{  
	// TODO: 在此添加消息处理程序代码和/或调用默认值  
	   
	CRect rect;  
	GetWindowRect(&rect);  
	CRect rect1 = rect;  
	rect1.DeflateRect(10, 10, -10, -10);  
	rect1.NormalizeRect();  
	
	if (point.x <= rect.left+3)  
	    return HTLEFT;  
	else if (point.x >= rect.right-3)  
	    return HTRIGHT;  
	else if (point.y <= rect.top+3)  
	    return HTTOP;  
	else if (point.y >= rect.bottom-3)  
	    return HTBOTTOM;  
	else if (point.x <= rect.left+10 && point.y <= rect.top+10)  
	    return HTTOPLEFT;  
	else if (point.x >= rect.right-10 && point.y <= rect.top+10)  
	    return HTTOPRIGHT;  
	else if (point.x <= rect.left+10 && point.y >= rect.bottom-10)  
	    return HTBOTTOMLEFT;  
	else if (point.x >= rect.right-10 && point.y >= rect.bottom-10)  
	    return HTBOTTOMRIGHT;  
	else if (!rect.IsRectEmpty())  
	{  
	    LRESULT uRet = CWnd::OnNcHitTest(point);  
	    uRet = (uRet == HTCLIENT) ? HTCAPTION : uRet;  
	    return uRet;  
	}  
	else  
	{  
	    return CWnd::OnNcHitTest(point);  
	} 
	 
	return 0;  
} 

void CNoBorderWndChangeSizeDlg::OnNcLButtonDown(UINT nHitTest, CPoint point)  
{  
    // TODO: 在此添加消息处理程序代码和/或调用默认值 
     
    if (nHitTest == HTTOP)  
    {         
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOP, MAKELPARAM(point.x, point.y));  
    }  
    else if (nHitTest == HTBOTTOM)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOM, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTLEFT)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_LEFT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTRIGHT)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_RIGHT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTTOPLEFT)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPLEFT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTTOPRIGHT)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_TOPRIGHT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTBOTTOMLEFT)  
        SendMessage( WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMLEFT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest == HTBOTTOMRIGHT)  
        SendMessage(WM_SYSCOMMAND, SC_SIZE | WMSZ_BOTTOMRIGHT, MAKELPARAM(point.x, point.y));  
    else if (nHitTest==HTCAPTION)  
        SendMessage(WM_SYSCOMMAND, SC_MOVE | 4, MAKELPARAM(point.x, point.y));  
} 

if(nHitTest == HTTOP)  
{         
    SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, TRUE, NULL, 0);  
    SendMessage(WM_SYSCOMMAND, SC_SIZE | WMSZ_TOP, MAKELPARAM(point.x, point.y));  
    SystemParametersInfo(SPI_SETDRAGFULLWINDOWS, FALSE, NULL, 0);  
}  

实现无边框窗体的拖动及窗体大小变化

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原文地址：http://blog.csdn.net/jiangqin115/article/details/42102445