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

zaishike

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

pretendersam

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
  // ...

zaishike

Still not working

sky_hexia

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.

pretendersam

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

robbi008

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