tree控件的SetItemData和GetItemData如何使用？如何把数据字段ID给Set上去？

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[Kudeet]

CTreeCtrl::SetItemData
BOOL SetItemData( HTREEITEM hItem, DWORD dwData );

Return Value

Nonzero if successful; otherwise 0.

如果成功则返回非零值；否则返回0。

Parameters

hItem

Handle of the item whose data is to be retrieved.

要获取其数据的项的句柄。

dwData

A 32-bit application-specific value associated with the item specified by hItem.

一个与由hItem指定的项关联的32位的应用程序指定值

Remarks

Call this function to set the 32-bit application-specific value associated with the specified item.

此成员函数用来设置与指定项关联的32位的应用程序指定值

[smileconfess]

CTreeCtrl* pmyTreeCtrl;
CString str;
HTREEITEM hItem;

// Insert 20 items into the tree control making the data of every item
// be the handle of the item.
for (int i=0;i < 20;i++)
{
str.Format(TEXT("item %d"), i);
hItem = pmyTreeCtrl->InsertItem(str);

if (hItem != NULL)
{
pmyTreeCtrl->SetItemData(hItem, (DWORD) hItem);
}
}

[smileconfess]

CTreeCtrl* pmyTreeCtrl;
// The item whose siblings will be checked.
extern HTREEITEM hmyItem;

// Delete all of the children of hmyItem whose item data is
// not equal to zero.
if (pmyTreeCtrl->ItemHasChildren(hmyItem))
{
HTREEITEM hNextItem;
HTREEITEM hChildItem = pmyTreeCtrl->GetChildItem(hmyItem);

while (hChildItem != NULL)
{
hNextItem = pmyTreeCtrl->GetNextItem(hChildItem, TVGN_NEXT);

if (pmyTreeCtrl->GetItemData(hChildItem) != 0)
{
pmyTreeCtrl->DeleteItem(hChildItem);
}

hChildItem = hNextItem;
}
}