在对话框上要应用滚动条，首先当然是要将对话框的属性vertical scroll选中(在这里只介绍纵向滚动条，横向滚动条与之原理相同)。然后是按Ctlr+w进入classwizard选中对话消息WM_OnVScroll，并添加它的响应函数，接着进入代码编辑区，写入代码：
void CRq::OnVScroll(UINT nSBCode, UINT nPos, CScrollBar* pScrollBar)
{
// TODO: Add your message handler code here and/or call default
SCROLLINFO scrollinfo;
GetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
switch (nSBCode)
{
case SB_BOTTOM:
ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMax)*10);
scrollinfo.nPos = scrollinfo.nMax;
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
break;
case SB_TOP:
ScrollWindow(0,(scrollinfo.nPos-scrollinfo.nMin)*10);
scrollinfo.nPos = scrollinfo.nMin;
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
break;
case SB_LINEUP:
scrollinfo.nPos -= 1;
if (scrollinfo.nPos<scrollinfo.nMin)
{
scrollinfo.nPos = scrollinfo.nMin;
break;
}
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
ScrollWindow(0,10);
break;
case SB_LINEDOWN:
scrollinfo.nPos += 1;
if (scrollinfo.nPos>scrollinfo.nMax)
{
scrollinfo.nPos = scrollinfo.nMax;
break;
}
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
ScrollWindow(0,-10);
break;
case SB_PAGEUP:
scrollinfo.nPos -= 5;
if (scrollinfo.nPos<scrollinfo.nMin)
{
scrollinfo.nPos = scrollinfo.nMin;
break;
}
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
ScrollWindow(0,10*5);
break;
case SB_PAGEDOWN:
scrollinfo.nPos += 5;
if (scrollinfo.nPos>scrollinfo.nMax)
{
scrollinfo.nPos = scrollinfo.nMax;
break;
}
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
ScrollWindow(0,-10*5);
break;
case SB_ENDSCROLL:
// MessageBox("SB_ENDSCROLL");
break;
case SB_THUMBPOSITION:
// ScrollWindow(0,(scrollinfo.nPos-nPos)*10);
// scrollinfo.nPos = nPos;
// SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
break;
case SB_THUMBTRACK:
ScrollWindow(0,(scrollinfo.nPos-nPos)*10);
scrollinfo.nPos = nPos;
SetScrollInfo(SB_VERT,&scrollinfo,SIF_ALL);
break;
}
CDialog::OnVScroll(nSBCode, nPos, pScrollBar);
}
以上代码完成后，滚动条已可以使用了。
但是应该如何将其它控件安排在对话框呢？很简单，你想用多大的对话框就将它拉多大，只需要在对话框所用的xxxx.cpp文件的void Cxxxx::DoDataExchange(CDataExchange* pDX)函数体中写入代码：
SetWindowPos(NULL,0,0,800,600,SWP_NOMOVE | SWP_NOZORDER);
其中800和600两个数字分别为对话框创建时的宽度和高度。
这样就可以方便地使用滚动条了。
本文来自CSDN博客，转载请标明出处：http://blog.csdn.net/zhanghaaaa/archive/2009/02/25/3937583.aspx