Callback - worked example

key : purple - original code / blue - new code

Step 1 :

Continue with the program names.

Step 2 :

Set the pszText member of the ListCtrl to LPSTR_TEXTCALLBACK :

void CNameListView::AddNameToListCtrl(CName * pNameTemp)
{

CListCtrl& m_listCtrl = GetListCtrl();

LV_ITEM listItem;
listItem.mask = LVIF_PARAM | LVIF_TEXT | LVIF_IMAGE;
listItem.iSubItem = 0;
listItem.lParam = (LPARAM)pNameTemp;
listItem.pszText = LPSTR_TEXTCALLBACK;

Step 3 :

Add the LVN_GETDISPINFO windows message handler to the ListCtrl.

void CNameListView::OnGetDispInfo(NMHDR* pNMHDR, LRESULT* pResult)
{

LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;
// TODO: Add your control notification handler code here
*pResult = 0;

}

Step 4 :

Edit the code in this function to allow the text to be obtained from the old list.

void CNameListView::OnGetDispInfo(NMHDR* pNMHDR, LRESULT* pResult)
{

LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;

if( pDispInfo->item.mask & LVIF_TEXT )
{

CName* pName = (CName*)pDispInfo->item.lParam;

if( pDispInfo->item.iSubItem == 0 )
{

strcpy( pDispInfo->item.pszText, pName->GetTitle() );

}
else if( pDispInfo->item.iSubItem == 1 )
{

strcpy( pDispInfo->item.pszText, pName->GetFirstName() );

}
else if( pDispInfo->item.iSubItem == 2 )
{

strcpy( pDispInfo->item.pszText, pName->GetSecondName() );

}

}

*pResult = 0;

}

Step 5 :

Use the same technique for the images :

void CNameListView::AddNameToListCtrl(CName * pNameTemp)
{

CListCtrl& m_listCtrl = GetListCtrl();

LV_ITEM listItem;
listItem.mask = LVIF_PARAM | LVIF_TEXT | LVIF_IMAGE;
listItem.iSubItem = 0;
listItem.lParam = (LPARAM)pNameTemp;
listItem.pszText = LPSTR_TEXTCALLBACK;
listItem.iImage = I_IMAGECALLBACK;

Step 6 :

Add new code to the GetDispInfo() function :

void CNameListView::OnGetDispInfo(NMHDR* pNMHDR, LRESULT* pResult)
{

LV_DISPINFO* pDispInfo = (LV_DISPINFO*)pNMHDR;
// TODO: Add your control notification handler code here
CName* pName = (CName*)pDispInfo->item.lParam;

if( pDispInfo->item.mask & LVIF_TEXT )
{

if( pDispInfo->item.iSubItem == 0 )
{

strcpy( pDispInfo->item.pszText, pName->GetTitle() );

}
else if( pDispInfo->item.iSubItem == 1 )
{

strcpy( pDispInfo->item.pszText, pName->GetFirstName() );

}
else if( pDispInfo->item.iSubItem == 2 )
{

strcpy( pDispInfo->item.pszText, pName->GetSecondName() );

}

}

if( pDispInfo->item.mask & LVIF_IMAGE )
{

if( pName->GetTitle() == "Mr" ||
pName->GetTitle() == "Sir")
{

pDispInfo->item.iImage = 0;

}
else if( pName->GetTitle() == "Dr" ||
pName->GetTitle() == "Prof")
{

pDispInfo->item.iImage = 2;

}
else // 99% certain that they must be female
{

pDispInfo->item.iImage = 1;

}

}

*pResult = 0;

}

Step 7 :

Now delete the code that is no longer required (the code below in red) :

void CNameListView::AddNameToListCtrl(CName * pNameTemp)
{

CListCtrl& m_listCtrl = GetListCtrl();

LV_ITEM listItem;
listItem.mask = LVIF_PARAM | LVIF_TEXT | LVIF_IMAGE;
listItem.iSubItem = 0;
listItem.lParam = (LPARAM)pNameTemp;
listItem.pszText = LPSTR_TEXTCALLBACK;

CString* temp = ((pNameTemp->GetTitleAddress()));

/* LPTSTR pBufTitle = (LPTSTR) temp->GetBuffer(temp->GetLength());
listItem.pszText = pBufTitle;

temp = ((pNameTemp->GetFirstNameAddress()));
LPTSTR pBufFirstName = (LPTSTR) temp->GetBuffer(temp->GetLength());

temp = ((pNameTemp->GetSecondNameAddress()));
LPTSTR pBufSecondName = (LPTSTR) temp->GetBuffer(temp->GetLength());
*/

if( pNameTemp->GetTitle() == "Mr" ||
pNameTemp->GetTitle() == "Sir")
{

listItem.iImage = 0;

}
else if( pNameTemp->GetTitle() == "Dr" ||
pNameTemp->GetTitle() == "Prof")
{

listItem.iImage = 2;

}
else // 99% certain that they must be female
{

listItem.iImage = 1;

}

listItem.iItem = m_listCtrl.GetItemCount();

m_listCtrl.InsertItem( &listItem );

//puts the firstname in col one, second name in col 2
/* m_listCtrl.SetItemText( listItem.iItem, 1, pBufFirstName );
m_listCtrl.SetItemText( listItem.iItem, 2, pBufSecondName );

temp->ReleaseBuffer();*/

}

void CNameListView::EditNameInListCtrl(CObject *pHintTemp)
{

CListCtrl& m_listCtrl = GetListCtrl();
LVFINDINFO findStruct;
findStruct.flags = LVFI_PARAM;

// this is the item that we want to change
findStruct.lParam = (LPARAM)pHintTemp;

// now change the item text - code similar to Initial function
LV_ITEM editItem;

editItem.iItem = m_listCtrl.FindItem(&findStruct);

CName * pNameTemp = (CName*)pHintTemp;

/* CString* temp = ((pNameTemp->GetTitleAddress()));

LPTSTR pBufTitle = (LPTSTR) temp->GetBuffer(temp->GetLength());
editItem.pszText = pBufTitle;

temp = ((pNameTemp->GetFirstNameAddress()));
LPTSTR pBufFirstName = (LPTSTR) temp->GetBuffer(temp->GetLength());

temp = ((pNameTemp->GetSecondNameAddress()));
LPTSTR pBufSecondName = (LPTSTR) temp->GetBuffer(temp->GetLength());
*/
if( pNameTemp->GetTitle() == "Mr" ||
pNameTemp->GetTitle() == "Sir")
{

editItem.iImage = 0;

}
else if( pNameTemp->GetTitle() == "Dr" ||
pNameTemp->GetTitle() == "Prof")
{

editItem.iImage = 2;

}
else // 99% certain that they must be female
{

editItem.iImage = 1;

}

// redraws one item - not all
m_listCtrl.RedrawItems(editItem.iItem, editItem.iItem);

// changes the text to the edited text
/* m_listCtrl.SetItemText( editItem.iItem, 0, pBufTitle );
m_listCtrl.SetItemText( editItem.iItem, 1, pBufFirstName );
m_listCtrl.SetItemText( editItem.iItem, 2, pBufSecondName );
temp->ReleaseBuffer();
*/

}

Click here for the basic exercise

Click here for the source code

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