我们有一个<条码>ExcelWriter求助类别,可向Excel(例如)倾倒各种物品。

• TADOQuery
• TListView
• TVirtualStringTree

在此情况下,快速通道(在此易于复制-帕斯特)是可向Excel倾斜的超载:

class function TExcelWriter.ExportToExcelVariantArray(const VArray: Variant; const Title, SubTitle: WideString): Boolean;
var
    xl: OleVariant;
    workbook: OleVariant;
    worksheet: OleVariant;
    range: OleVariant;
    Rowcount, ColumnCount: Integer;
    HeaderRowIndex: Integer;
    s: WideString;
begin
    Result := False;

    if not VarIsArray(VArray) then
        raise EExcelWriterException.Create( ExportToExcelVariantArray: Supplied variant is not an array );

    if VarArrayDimCount(VArray) <> 2 then
        raise EExcelWriterException.Create( ExportToExcelEVariantArray: Supplied variant array does not have 2 dimensions ( +IntToStr(VarArrayDimCount(VArray))+ ) );

    ColumnCount := VarArrayHighBound(VArray, 2) - VarArrayLowBound(VArray, 2); //2 for "leftmost dimension"
    rowCount := VarArrayHighBound(VArray, 1) - VarArrayLowBound(VArray, 1); //1 for "leftmost dimension"

    try
        xl := CreateOleObject( Excel.Application );
    except
        on E:Exception do
        begin
            if (E is EOleSysError) then
            begin
                if EOleSysError(E).ErrorCode = CO_E_CLASSSTRING then
                    raise EExcelWriterException.Create( Excel is not installed. +CRLF+
                             Could not load "Excel.Application" object (Co_E_CLASSSTRING) )
                else
                    raise;
            end
            else
                raise;
        end;
    end;
    try
        xl.ScreenUpdating := False;
        xl.DisplayAlerts := False;  // Don t display dialogs such as "save changes to workbook".


        workbook := xl.Workbooks.Add;
        try
            Worksheet := Workbook.Worksheets[1];
            try
                Worksheet.Activate;
                Worksheet.Cells.WrapText := False;

                HeaderRowIndex := 1; //Rows&Columns in Excel start at one.
                range := TExcelWriter.GetRange(worksheet, HeaderRowIndex, 1, HeaderRowIndex+RowCount, ColumnCount);
                range.Value := VArray;

                //Bold the header row
                Worksheet.Rows[HeaderRowIndex].Font.Bold := True;
                Worksheet.Rows[HeaderRowIndex].Font.Underline := True;
                Worksheet.Columns.AutoFit;

                //Set printed header&footer
                if Copy(Title, 1, 2) =  @@  then
                    s := Copy(Title, 3, MaxInt)
                else
                    s := Title;
                if SubTitle <>    then
                begin
                    if s <>    then s := s+#13;
                    s := s + SubTitle;
                end;

                TExcelWriter.SetHeaderAndFooters(Worksheet,
                        s,   ,   ,
                         &D &T ,   ,  Page &P of &N );
            finally
                Worksheet := Unassigned;
            end;
        finally
            Workbook := Unassigned;
        end;

        //When all done
        xl.ScreenUpdating := True;
        xl.Visible := True;
        xl.UserControl := True; // Very important, prevents Excel from going
                  // away when we nil out our reference to it below.
    finally
        xl := Unassigned;
    end;

    Result := True;
end;

我们有<条码>TVirtualListView的后代 TVirtualStringTre,使之容易过渡到虚拟轨道(有<条码> TVirtualListItem等)。 然后,它有一套助手方法<代码>Content ToVariantArray,类似于Content ToHtml和。

function TVirtualListView.ContentToVariantArray: Variant;
var
    Columns: TColumnsArray;
    VArray: Variant;
    Node: PVirtualNode;
    ColumnCount: Integer;
    RowCount: Integer;
    nRow: Integer;
    i: Integer;
begin
    Columns := Self.Columns.GetVisibleColumns;

    ColumnCount := Length(Columns);
    RowCount := Self.Items.Count+1; //+1 for the heaader

    VArray := VarArrayCreate([0, RowCount-1, 0, ColumnCount-1], varOleStr); //Docs say cannot use varString, must be varOleStr (which is a BSTR i.e. WideString)

    nRow := 0;

    for i := 0 to ColumnCount-1 do
    begin
        VArray[nRow, i] := Self.Columns.Items[Columns[i].Index].Text;
    end;

    Node := Self.GetFirst;
    while Assigned(Node) do
    begin
        Inc(nRow);
        for i := 0 to ColumnCount-1 do
        begin
            VArray[nRow, i] := Self.Text[Node, Columns[i].Index];
        end;

        Node := Self.GetNextSibling(Node);
    end;

    Result := VArray;
end;

以上编码显示用户Excel(为只看一看一看便把档案保存到硬盘中是浪费的),而不是创建出口档案。 但很难打到<代码>。 Save or whatever the API is.

CSV 比较容易。

你的数据是你自己的数据,因为虚拟数据库没有数据,因此它是一个虚拟集装箱。 因此,如果您的虚拟树体是TMyObjects(集装箱)清单的一种看法,那么它就应当比CSV的产出小一些,而如果你一栏可以按不同顺序排列,或者能够看到的一组子,那么虚拟树的含量将真正重要。

我建议你调查自由的JVCL JvCsvDataSet,这是撰写CSV档案的真正容易的方法。

如果你真的想要XLS产出的话,就有这方面的图书馆。

建立了CSV(与html)。

var ss : AnsiString;
...
 if ExtractFileExt(DestFileName)= .htm 
 then
     ss:=VST.ContentToHtml(tstAll,  Html exp )
 else
     ss:=VST.ContentToText(tstAll,  ; );

 with TFileStream.Create(DestFileName, fmCreate or fmShareDenyWrite) do
 begin
      Write(ss[1], length(ss));
      Free;
 end;