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GetFirstSelectedItemPosition() returns the selected row, why is it always 0?

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Post time: 2020-12-8 09:00:01
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void CStudentManageView::OnClickLISTBaseInfo(NMHDR* pNMHDR, LRESULT* pResult)
{
//When clicking, select a row
::SendMessage(m_listBaseInfo.m_hWnd, LVM_SETEXTENDEDLISTVIEWSTYLE, LVS_EX_FULLROWSELECT, LVS_EX_FULLROWSELECT);

//Display student achievement information of the selected row
    POSITION pos = m_listBaseInfo.GetFirstSelectedItemPosition();
if(pos == NULL)
{
MessageBox("No Item is Selected");
}
else
{
while (pos)
{
int nItem = m_listBaseInfo.GetNextSelectedItem(pos);
}
}

int a = m_listBaseInfo.GetSelectionMark();
*pResult = 0;
}


No matter which row I click, it returns 0x00000, which is NULL. I don't know what happened? I am a novice, thanks
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Post time: 2020-12-8 12:15:01
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Try adding a sentence to the first line of this function:
void CStudentManageView::OnClickLISTBaseInfo(NMHDR* pNMHDR, LRESULT* pResult)
{
  m_listBaseInfo.SetFocus(); // Activate the list control
  // ...
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 Author| Post time: 2020-12-8 12:30:02
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Still not working
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Post time: 2020-12-8 13:45:01
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Maybe you should change the notification response message instead of responding to LVN_CLICK, but to respond to the LVN_ITEMCHANGED notification. In addition, pNMHDR can be cast to a type related to the ListView control. There may be a member iItem. If it is not -1, it should be I can't remember the current line being clicked.
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Post time: 2020-12-8 14:00:01
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Remove the following sentence
::SendMessage(m_listBaseInfo.m_hWnd, LVM_SETEXTENDEDLISTVIEWSTYLE, LVS_EX_FULLROWSELECT, LVS_EX_FULLROWSELECT);
This work should set the style of m_listBaseInfo to LVS_EX_FULLROWSELECT at the time of initialization, so that when you click, an entire row will be automatically selected, at this time GetFirstSelectedItemPosition(); has a value
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Post time: 2020-12-8 18:00:01
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Original poster, I also encountered this problem a few days ago. Later, I realized that position and id can be used for direct reference. When you enter OnClickLISTBaseInfo, position has become the value you clicked. Using the SelectedItemPosition() method will erase the position value, it’s that simple
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