cxExportTLToExcelStream(TStream,TcxCustomTreeList,Boolean,Boolean,Boolean,TObject) Method

Exports content of a tree list control to a stream in Microsoft Excel® binary format (XLS).

Declaration

procedure cxExportTLToExcelStream(AStream: TStream; ATreeList: TcxCustomTreeList; AExpand: Boolean = True; ASaveAll: Boolean = True; AUseNativeFormat: Boolean = True; AHandler: TObject = nil);

Parameters

Name	Type	Description
AStream	TStream	The target stream.
ATreeList	TcxCustomTreeList	The source tree list control.
AExpand	Boolean	Optional. Specifies if all source tree list nodes are expanded: If True (default), the procedure exports all rows, including the rows hidden within collapsed tree list nodes. If False, the procedure exports only visible rows.
ASaveAll	Boolean	Optional. Specifies if the procedure exports all available rows: If True (default), the procedure exports all or only visible rows depending on the AExpand parameter value. If False, the procedure exports only selected rows.
AUseNativeFormat	Boolean	Optional. Specifies if the procedure uses the native data format: If True (default), the procedure attempts to convert display text of grid cells to their underlying data format (Currency, Date, Time, Numeric, etc.). Refer to the Remarks section for the list of supported in-place editors and corresponding data formats. If False, the procedure exports display text as string values.
AHandler	TObject	Optional. Specifies a handler object that should implement the IcxExportBeforeSave and/or IcxExportProgress interfaces to allow you to perform specific actions before the beginning of an export operation and track its progress. Tip Refer to the following topic for detailed information on how to create and use handler objects: How to: Track Data Export Progress

Remarks

If you pass True as the AUseNativeFormat parameter, the cxExportTLToExcelStream procedure attempts to convert display text of a grid item’s cells to their underlying data format (Currency, Date, Time, Numeric, etc.) If you assign an in-place editor to a cell, the export procedure selects the data format according to the following table:

In-place Editor	Data Format
TcxCurrencyEdit	Currency
TcxMaskEdit or TcxCalcEdit	Currency, if the assigned editor is bound to a dataset field whose values are formatted as currency values (TAggregateField.Currency, TBCDField.Currency, TFloatField.Currency, or TFMTBCDField.Currency). Otherwise, the data format is Number.
TcxDateEdit	Date
TcxTimeEdit	Time
TcxSpinEdit	Number

If any other editor is assigned to a cell, the cxExportTLToExcelStream procedure exports its display text regardless of the AUseNativeFormat parameter value. If it is impossible to convert display text to the target data type for any reason, the display text is exported as a string.

Note

The listed data formats are used for value conversion only. They do not correspond to cell number formats found in Microsoft Excel®. Populated cells have the General format.

Summary values use the same data type as cell values against which these summaries are calculated if the following conditions are met for the corresponding summary items:

• An empty string is assigned to a summary item’s Format property.
• An OnGetText event handler is not assigned to a summary item.

Code Example

The following code example exports tree list content to a file in Excel format:

Delphi

uses cxTLExportLink;
// ...
var
  AStream: TMemoryStream;
begin
  AStream := TMemoryStream.Create;
  cxExportTLToExcelStream(AStream, cxDBTreeList);
  AStream.SaveToFile('Departments.xls');
  AStream.Free;
end;

C++

#include "cxTLExportLink.hpp"  
// ...
  TMemoryStream *AStream = nullptr;
  // ...
  AStream = new TMemoryStream();
  cxExportTLToExcelStream(AStream, cxDBTreeList);
  AStream->SaveToFile("Departments.xls");
  delete AStream;

The following image demonstrates the exported content of a memory stream when it is saved to a file: