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  • Serializing CTreeCtrl to / from a text file

    http://www.codeguru.com/Cpp/controls/treeview/misc-advanced/article.php/c713/

    To serialize the tree view control override the Serialize() function. The Serialize() function is a virtual function defined in Cobject.

    In the code below we save the outline to a text file and can read it back from a text file. When saving the outline to the archive, tabs are used to indent the item text. Again, when reading back, tabs are used to determine the level that the newly read item should be placed at.
     

     1 void CTreeCtrlX::Serialize(CArchive& ar) 
    2 {
    3 if (ar.IsStoring())
    4 {
    5 // storing code
    6 HTREEITEM hti = GetRootItem();
    7 while( hti )
    8 {
    9 int indent = GetIndentLevel( hti );
    10 while( indent-- )
    11 ar.WriteString( "\t" );
    12 ar.WriteString( GetItemText( hti ) + "\r\n");
    13 hti = GetNextItem( hti );
    14 }
    15
    16 }
    17 else
    18 {
    19 // loading code
    20 CString sLine;
    21 if( !ar.ReadString( sLine ) )
    22 return;
    23
    24 HTREEITEM hti = NULL;
    25 int indent, baseindent = 0;
    26 while( sLine[baseindent] == '\t' )
    27 baseindent++;
    28 do
    29 {
    30 if( sLine.GetLength() == 0 )
    31 continue;
    32 for( indent = 0; sLine[indent] == '\t'; indent++ )
    33 ; // We don't need a body
    34 sLine = sLine.Right( sLine.GetLength() - indent );
    35 indent -= baseindent;
    36
    37 HTREEITEM parent;
    38 int previndent = GetIndentLevel( hti );
    39 if( indent == previndent)
    40 parent = GetParentItem( hti );
    41 else if( indent > previndent )
    42 parent = hti;
    43 else
    44 {
    45 int nLevelsUp = previndent - indent;
    46 parent = GetParentItem( hti );
    47 while( nLevelsUp-- )
    48 parent = GetParentItem( parent );
    49 }
    50 hti = InsertItem( sLine, parent ? parent : TVI_ROOT, TVI_LAST );
    51 }while( ar.ReadString( sLine ) );
    52
    53 }
    54 }
    55
    56
    57
    58 int CTreeCtrlX::GetIndentLevel( HTREEITEM hItem )
    59 {
    60 int iIndent = 0;
    61
    62 while( (hItem = GetParentItem( hItem )) != NULL )
    63 iIndent++;
    64 return iIndent;
    65 }
    66
    67
    68 // GetNextItem - Get next item as if outline was completely expanded
    69 // Returns - The item immediately below the reference item
    70 // hItem - The reference item
    71 HTREEITEM CTreeCtrlX::GetNextItem( HTREEITEM hItem )
    72 {
    73 HTREEITEM hti;
    74
    75 if( ItemHasChildren( hItem ) )
    76 return GetChildItem( hItem ); // return first child
    77 else{
    78 // return next sibling item
    79 // Go up the tree to find a parent's sibling if needed.
    80 while( (hti = GetNextSiblingItem( hItem )) == NULL ){
    81 if( (hItem = GetParentItem( hItem ) ) == NULL )
    82 return NULL;
    83 }
    84 }
    85 return hti;
    86 }


    //我对它的新改进,适用于有图片的情况
     1 void CFileView::Serialize(CArchive& ar)
    2 {
    3 if (ar.IsStoring())
    4 { // storing code
    5 HTREEITEM hti = m_wndFileView.GetRootItem();
    6 while( hti )
    7 {
    8 int indent = GetIndentLevel( hti );
    9 while( indent-- )
    10 ar.WriteString( _T("\t") );
    11 int nImage = 0;
    12 int nSelectedImage = 0;
    13 m_wndFileView.GetItemImage(hti,nImage,nSelectedImage);
    14 CString str;
    15 str.Format(_T("%d\t%d\t"),nImage,nSelectedImage);
    16 ar.WriteString( str + m_wndFileView.GetItemText( hti ) + "\r\n");
    17 hti = GetNextItem( hti );
    18 }
    19 }
    20 else
    21 { // loading code
    22 CString sLine;
    23 CString nImage;
    24 CString nSelectImage;
    25 if( !ar.ReadString( sLine ) )
    26 return;
    27
    28 HTREEITEM hti = NULL;
    29 int indent, baseindent = 0;
    30 while( sLine[baseindent] == '\t' )
    31 baseindent++;
    32 do
    33 {
    34 if( sLine.GetLength() == 0 )
    35 continue;
    36 for( indent = 0; sLine[indent] == '\t'; indent++ )
    37 ; // We don't need a body
    38 sLine = sLine.Right( sLine.GetLength() - indent );
    39 nImage = sLine[0];
    40 nSelectImage = sLine[2];
    41 sLine = sLine.Right(sLine.GetLength() - 4);
    42 indent -= baseindent;
    43
    44 HTREEITEM parent;
    45 int previndent = GetIndentLevel( hti );
    46 if( indent == previndent)
    47 parent = m_wndFileView.GetParentItem( hti );
    48 else if( indent > previndent )
    49 parent = hti;
    50 else
    51 {
    52 int nLevelsUp = previndent - indent;
    53 parent = m_wndFileView.GetParentItem( hti );
    54 while( nLevelsUp-- )
    55 parent = m_wndFileView.GetParentItem( parent );
    56 }
    57 hti = m_wndFileView.InsertItem( sLine,_ttoi(nImage),_ttoi(nSelectImage), parent ? parent : TVI_ROOT, TVI_LAST );
    58 }while( ar.ReadString( sLine ) );
    59 }


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  • 原文地址:https://www.cnblogs.com/luoshupeng/p/2222033.html
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