Question

怎么获得listcontrol前面checkbox的状态改变

Answer 1

1 建立测试工程
新建一个对话框工程，并添加一个CListCtrl控件，并关联一个成员变量m_List。
2 设置LVS_EX_CHECKBOXES风格
ListView_SetExtendedListViewStyle(m_List.GetSafeHwnd(), m_List.GetExStyle() | LVS_EX_CHECKBOXES);
3 为listctrl添加测试项
在OnInitDialog()中添加如下代码：
m_List.InsertColumn(0,"Name",LVCFMT_LEFT,150);
m_List.InsertColumn(1,"Sex",LVCFMT_LEFT,200);
m_List.InsertItem(0, "ZhangSan");
m_List.InsertItem(1, "LiSi");
4 添加控件通知消息
为ListCtrl控件添加LVN_ITEMCHANGED消息。系统生成如下代码：
void CXXXDlg::OnLvnItemchangedList1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
// TODO: Add your control notification handler code here

*pResult = 0;
}

5 在LVN_ITEMCHANGED消息处理函数中添加代码如下：
void CXXXDlg::OnLvnItemchangedList1(NMHDR *pNMHDR, LRESULT *pResult)
{
LPNMLISTVIEW pNMLV = reinterpret_cast<LPNMLISTVIEW>(pNMHDR);
// TODO: Add your control notification handler code here

/*
typedef struct tagNMLISTVIEW
{
NMHDR hdr;
int iItem;
int iSubItem;
UINT uNewState;
UINT uOldState;
UINT uChanged;
POINT ptAction;
LPARAM lParam;
} NMLISTVIEW, *LPNMLISTVIEW;
*/
if((pNMLV->uOldState & INDEXTOSTATEIMAGEMASK(1)) /* old state : unchecked */
&& (pNMLV->uNewState & INDEXTOSTATEIMAGEMASK(2)) /* new state : checked */
)
{
TRACE("Item %d is checked\n", pNMLV->iItem);
}
else if((pNMLV->uOldState & INDEXTOSTATEIMAGEMASK(2)) /* old state : checked */
&& (pNMLV->uNewState & INDEXTOSTATEIMAGEMASK(1)) /* new state : unchecked */
)
{
TRACE("Item %d is unchecked\n", pNMLV->iItem);
}
else
{
TRACE("Item %d does't change the check-status\n", pNMLV->iItem);
}

*pResult = 0;
}

6 调试
在debug环境下，改变checkbox的选中状态，查看输出信息。
OK.