遍历CTreeView的item时非法操作

Question

Are you sure the following  is right?!       CTreeCtrl &TreeCtrl = GetTreeCtrl();Maybe you should use point!CTreeCtrl pTreeCtrl = GetTreeCtrl();
int nCount = 0;
HTREEITEM hCurrent = TreeCtrl->GetNextItem(TVI_ROOT, TVGN_NEXT);//非法操作
while (hCurrent != NULL)
{        TVITEM item;
        TCHAR szText[1024];
        item->hItem = hCurrent;
        item->mask = TVIF_TEXT | TVIF_HANDLE;
        item->pszText = szText;
        item->cchTextMax = 1024;        BOOL bWorked = TreeCtrl->GetItem(&item);        // Try to get the next item
        hCurrent = TreeCtrl->GetNextItem(hCurrent, TVGN_NEXT);        if (bWorked)
            nCount ++;
}       

Answer 1

tpProgramer(tp编程者):
   你说的不对。GetTreeCtrl();返回的是一个引用，而不是指针。

Answer 2

the point and the reference:
 
 int i =5;
 int *p = &i;  // pointer p point the address of an Integer variant;
 
so, you should use point to a address of a variant!! CTreeCtrl* pTreeCtrl = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
ASSERT(pTreeCtrl != NULL);int nCount = 0;
HTREEITEM hCurrent = pTreeCtrl->GetNextItem(TVI_ROOT, TVGN_NEXT);//非法操作
while (hCurrent != NULL)
{        TVITEM item;
        TCHAR szText[1024];
        item->hItem = hCurrent;
        item->mask = TVIF_TEXT ¦ TVIF_HANDLE;
        item->pszText = szText;
        item->cchTextMax = 1024;        BOOL bWorked = pTreeCtrl->GetItem(&item);        // Try to get the next item
        hCurrent = pTreeCtrl->GetNextItem(hCurrent, TVGN_NEXT);        if (bWorked)
            nCount ++;
}

Answer 3

the point and the reference:
 
 int i =5;
 int *p = &i;  // pointer p point the address of an Integer variant;
 
so, you should use point to a address of a variant!! CTreeCtrl* pTreeCtrl = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
ASSERT(pTreeCtrl != NULL);int nCount = 0;
HTREEITEM hCurrent = pTreeCtrl->GetNextItem(TVI_ROOT, TVGN_NEXT);//非法操作
while (hCurrent != NULL)
{        TVITEM item;
        TCHAR szText[1024];
        item->hItem = hCurrent;
        item->mask = TVIF_TEXT ¦ TVIF_HANDLE;
        item->pszText = szText;
        item->cchTextMax = 1024;        BOOL bWorked = pTreeCtrl->GetItem(&item);        // Try to get the next item
        hCurrent = pTreeCtrl->GetNextItem(hCurrent, TVGN_NEXT);        if (bWorked)
            nCount ++;
}

Answer 4

the point and the reference:
 
 int i =5;
 int *p = &i;  // pointer p point the address of an Integer variant;
 
so, you should use point to a address of a variant!! CTreeCtrl* pTreeCtrl = (CTreeCtrl*) GetDlgItem(IDC_TREE1);
ASSERT(pTreeCtrl != NULL);int nCount = 0;
HTREEITEM hCurrent = pTreeCtrl->GetNextItem(TVI_ROOT, TVGN_NEXT);//非法操作
while (hCurrent != NULL)
{        TVITEM item;
        TCHAR szText[1024];
        item->hItem = hCurrent;
        item->mask = TVIF_TEXT ¦ TVIF_HANDLE;
        item->pszText = szText;
        item->cchTextMax = 1024;        BOOL bWorked = pTreeCtrl->GetItem(&item);        // Try to get the next item
        hCurrent = pTreeCtrl->GetNextItem(hCurrent, TVGN_NEXT);        if (bWorked)
            nCount ++;
}

Answer 5

据我所知GetDlgItem(IDC_TREE1)返回的是对象地址，但是在CTreeView中GetTreeCtrl();返回的是对象的引用。关于这个你可以查阅MSDN中的CTreeView的GetTreeCtrl()部分。
该函数原型是CTreeCtrl& GetTreeCtrl( ) const;