指针的问题

[lm9764]

void CUserMaintenanceDlg::FillListboxWithUsers()
{
int iIndex;
CDatabase db;
UserMaster *pUserMaster= NULL;//UserMaster 是一个RecordSet 类
try
{
if(db.Open("Is"))
{
pUserMaster = new UserMaster();
pUserMaster->Open();
pUserMaster->MoveFirst();
while(!pUserMaster->IsEOF())
{
User * pUser = new User();//User是一个CListBox类
pUser->m_strUserID=pUserMaster>m_sUserID;
pUser->m_strUserName=pUserMaster->m_sUserName;
pUser->m_iStatus=pUserMaster->m_iStatus;
iIndex = m_lbxUsers.AddString(pUserMaster->m_sUserName);//m_lbxUsers是一个ClistBox 对象
m_lbxUsers.SetItemData(iIndex,(DWORD)pUser);{这地方不太明白}
pUserMaster->MoveNext();
}
pUserMaster->Close();
delete pUserMaster;
db.Close();
}
}
catch(CDBException *pe)
{
AfxMessageBox(pe->m_strError);
if(pUserMaster)
{
if(pUserMaster->IsOpen())
{
pUserMaster->Close();
}
delete pUserMaster;
}
if(db.IsOpen())
{
db.Close();
}
pe->Delete();
}
}


void CUserMaintenanceDlg::OnSelchangeList1()
{
// TODO: Add your control notification handler code here
int iIndex;
User *pUser;
if(GetSelectedUser(&iIndex,&pUser))
{
m_strUserID = pUser->m_strUserID;
m_strUserName = pUser->m_strUserName;
m_iStatus = pUser->m_iStatus;

m_btnSave.EnableWindow(true);
m_btnDelete.EnableWindow(true);
UpdateData(false);
}

}
BOOL CUserMaintenanceDlg::GetSelectedUser(int *piIndex,User**ppUser)
{
BOOL bSuccess = false;
int iIndex;
if(LB_ERR!=(iIndex = m_lbxUsers.GetCurSel()))
{
*piIndex = iIndex;
m_a=m_lbxUsers.GetItemData(iIndex);//这一行是我加进去看pUser中到底是始末？好像是地址！
*ppUser = (User*)m_lbxUsers.GetItemData(iIndex);
bSuccess = true;
UpdateData(false);
}
return bSuccess;
}

m_lbxUsers.SetItemData(iIndex,(DWORD)pUser)SetItemData( int nIndex, DWORD dwItemData );
在MSDN中的SetItemData( int nIndex, DWORD dwItemData )意思是：Sets a 32-bit value associated with the specified item in a list box.那么m_lbxUsers.SetItemData(iIndex,(DWORD)pUser);就是把iIndex和pUser关联起来我想知道pUser里边的内容到底是始末：到底是始末地址？？但是你看while(!pUserMaster->IsEOF())
{
User * pUser = new User();//User是一个CListBox类
pUser->m_strUserID=pUserMaster>m_sUserID;
pUser->m_strUserName=pUserMaster->m_sUserName;
pUser->m_iStatus=pUserMaster->m_iStatus;
iIndex = m_lbxUsers.AddString(pUserMaster->m_sUserName);//m_lbxUsers是一个ClistBox 对象
m_lbxUsers.SetItemData(iIndex,(DWORD)pUser);{这地方不太明白}
pUserMaster->MoveNext();
}说明数据库表中的数据都通过循环存到pUser中去了
pUser中的数据不会在循环中覆盖上次的数据吗？？


因为在void CUserMaintenanceDlg::OnSelchangeList1()
中就是又读pUser的地址把数据显示出来的

[super_xxx]

m_lbxUsers.SetItemData(iIndex,(DWORD)pUser);{这地方不太明白}

就是把pUser的指针内容记录到ITEM（iIndex)中的一个变量里了