See Also : Article_4724.asp - (Freeform Excel Worksheet)
This class will produce an Excel Spreadsheet from a TDataSet. No OLE is required or Excel Installation needed to create the file. The one problem with Excel OLE is that is tends to be rather Sloooow. The class uses standard Delphi I/O functions and is considerably faster than the OLE calls.
Example.
var XL : TDataSetToExcel;
begin
XL := TDataSetToExcel.Create(MyQuery,'c:\temp\test.xls');
XL.WriteFile;
XL.Free;
end;
The columns are neatly sized, Numerics are formatted in "Courier" and obey "###,###,##0.00" for floats and "0" for integers. Dates are formatted "dd-MMM-yyyy hh:nn:ss". Column headers are in Bold and are boxed and shaded.
unit MahExcel;
interface
uses Windows, SysUtils, DB, Math;
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// =============================================================================
// TDataSet to Excel without OLE or Excel required
//
// For a good reference on Excel BIFF? file format see site
// http://sc.openoffice.org/excelfileformat.pdf
//
// Mike Heydon Dec 2002
// =============================================================================
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type
// TDataSetToExcel
TDataSetToExcel = class(TObject)
protected
procedure WriteToken(AToken : word; ALength : word);
procedure WriteFont(const AFontName : string; AFontHeight,
AAttribute : word);
procedure WriteFormat(const AFormatStr : string);
private
FRow : word;
FDataFile : file;
FFileName : string;
FDataSet : TDataSet;
public
constructor Create(ADataSet : TDataSet; const AFileName : string);
function WriteFile : boolean;
end;
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// -----------------------------------------------------------------------------
implementation
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const
// XL Tokens
XL_DIM = $00;
XL_BOF = $09;
XL_EOF = $0A;
XL_DOCUMENT = $10;
XL_FORMAT = $1E;
XL_COLWIDTH = $24;
XL_FONT = $31;
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// XL Cell Types
XL_INTEGER = $02;
XL_DOUBLE = $03;
XL_STRING = $04;
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// XL Cell Formats
XL_INTFORMAT = $81;
XL_DBLFORMAT = $82;
XL_XDTFORMAT = $83;
XL_DTEFORMAT = $84;
XL_TMEFORMAT = $85;
XL_HEADBOLD = $40;
XL_HEADSHADE = $F8;
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// ========================
// Create the class
// ========================
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constructor TDataSetToExcel.Create(ADataSet : TDataSet;
const AFileName : string);
begin
FDataSet := ADataSet;
FFileName := ChangeFileExt(AFilename,'.xls');
end;
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// ====================================
// Write a Token Descripton Header
// ====================================
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procedure TDataSetToExcel.WriteToken(AToken : word; ALength : word);
var aTOKBuffer : array [0..1] of word;
begin
aTOKBuffer[0] := AToken;
aTOKBuffer[1] := ALength;
Blockwrite(FDataFile,aTOKBuffer,SizeOf(aTOKBuffer));
end;
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// ====================================
// Write the font information
// ====================================
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procedure TDataSetToExcel.WriteFont(const AFontName : string;
AFontHeight,AAttribute : word);
var iLen : byte;
begin
AFontHeight := AFontHeight * 20;
WriteToken(XL_FONT,5 + length(AFontName));
BlockWrite(FDataFile,AFontHeight,2);
BlockWrite(FDataFile,AAttribute,2);
iLen := length(AFontName);
BlockWrite(FDataFile,iLen,1);
BlockWrite(FDataFile,AFontName[1],iLen);
end;
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// ====================================
// Write the format information
// ====================================
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procedure TDataSetToExcel.WriteFormat(const AFormatStr : string);
var iLen : byte;
begin
WriteToken(XL_FORMAT,1 + length(AFormatStr));
iLen := length(AFormatStr);
BlockWrite(FDataFile,iLen,1);
BlockWrite(FDataFile,AFormatStr[1],iLen);
end;
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// ====================================
// Write the XL file from data set
// ====================================
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function TDataSetToExcel.WriteFile : boolean;
var bRetvar : boolean;
aDOCBuffer : array [0..1] of word;
aDIMBuffer : array [0..3] of word;
aAttributes : array [0..2] of byte;
i : integer;
iColNum,
iDataLen : byte;
sStrData : string;
fDblData : double;
wWidth : word;
begin
bRetvar := true;
FRow := 0;
FillChar(aAttributes,SizeOf(aAttributes),0);
AssignFile(FDataFile,FFileName);
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try
Rewrite(FDataFile,1);
// Beginning of File
WriteToken(XL_BOF,4);
aDOCBuffer[0] := 0;
aDOCBuffer[1] := XL_DOCUMENT;
Blockwrite(FDataFile,aDOCBuffer,SizeOf(aDOCBuffer));
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// Font Table
WriteFont('Arial',10,0);
WriteFont('Arial',10,1);
WriteFont('Courier New',11,0);
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// Column widths
for i := 0 to FDataSet.FieldCount - 1 do begin
wWidth := (FDataSet.Fields[i].DisplayWidth + 1) * 256;
if FDataSet.FieldDefs[i].DataType = ftDateTime then inc(wWidth,2000);
if FDataSet.FieldDefs[i].DataType = ftDate then inc(wWidth,1050);
if FDataSet.FieldDefs[i].DataType = ftTime then inc(wWidth,100);
WriteToken(XL_COLWIDTH,4);
iColNum := i;
BlockWrite(FDataFile,iColNum,1);
BlockWrite(FDataFile,iColNum,1);
BlockWrite(FDataFile,wWidth,2);
end;
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// Column Formats
WriteFormat('General');
WriteFormat('0');
WriteFormat('###,###,##0.00');
WriteFormat('dd-mmm-yyyy hh:mm:ss');
WriteFormat('dd-mmm-yyyy');
WriteFormat('hh:mm:ss');
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// Dimensions
WriteToken(XL_DIM,8);
aDIMBuffer[0] := 0;
aDIMBuffer[1] := Min(FDataSet.RecordCount,$FFFF);
aDIMBuffer[2] := 0;
aDIMBuffer[3] := Min(FDataSet.FieldCount - 1,$FFFF);
Blockwrite(FDataFile,aDIMBuffer,SizeOf(aDIMBuffer));
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// Column Headers
for i := 0 to FDataSet.FieldCount - 1 do begin
sStrData := FDataSet.Fields[i].DisplayName;
iDataLen := length(sStrData);
WriteToken(XL_STRING,iDataLen + 8);
WriteToken(FRow,i);
aAttributes[1] := XL_HEADBOLD;
aAttributes[2] := XL_HEADSHADE;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,iDataLen,SizeOf(iDataLen));
if iDataLen > 0 then BlockWrite(FDataFile,sStrData[1],iDataLen);
aAttributes[2] := 0;
end;
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// Data Rows
while not FDataSet.Eof do begin
inc(FRow);
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for i := 0 to FDataSet.FieldCount - 1 do begin
case FDataSet.FieldDefs[i].DataType of
ftBoolean,
ftWideString,
ftFixedChar,
ftString : begin
sStrData := FDataSet.Fields[i].AsString;
iDataLen := length(sStrData);
WriteToken(XL_STRING,iDataLen + 8);
WriteToken(FRow,i);
aAttributes[1] := 0;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,iDataLen,SizeOf(iDataLen));
if iDataLen > 0 then
BlockWrite(FDataFile,sStrData[1],iDataLen);
end;
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ftAutoInc,
ftSmallInt,
ftInteger,
ftWord,
ftLargeInt : begin
fDblData := FDataSet.Fields[i].AsFloat;
iDataLen := SizeOf(fDblData);
WriteToken(XL_DOUBLE,15);
WriteToken(FRow,i);
aAttributes[1] := XL_INTFORMAT;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,fDblData,iDatalen);
end;
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ftFloat,
ftCurrency,
ftBcd : begin
fDblData := FDataSet.Fields[i].AsFloat;
iDataLen := SizeOf(fDblData);
WriteToken(XL_DOUBLE,15);
WriteToken(FRow,i);
aAttributes[1] := XL_DBLFORMAT;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,fDblData,iDatalen);
end;
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ftDateTime : begin
fDblData := FDataSet.Fields[i].AsFloat;
iDataLen := SizeOf(fDblData);
WriteToken(XL_DOUBLE,15);
WriteToken(FRow,i);
aAttributes[1] := XL_XDTFORMAT;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,fDblData,iDatalen);
end;
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ftDate : begin
fDblData := FDataSet.Fields[i].AsFloat;
iDataLen := SizeOf(fDblData);
WriteToken(XL_DOUBLE,15);
WriteToken(FRow,i);
aAttributes[1] := XL_DTEFORMAT;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,fDblData,iDatalen);
end;
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ftTime : begin
fDblData := FDataSet.Fields[i].AsFloat;
iDataLen := SizeOf(fDblData);
WriteToken(XL_DOUBLE,15);
WriteToken(FRow,i);
aAttributes[1] := XL_TMEFORMAT;
BlockWrite(FDataFile,aAttributes,SizeOf(aAttributes));
BlockWrite(FDataFile,fDblData,iDatalen);
end;
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end;
end;
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FDataSet.Next;
end;
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// End of File
WriteToken(XL_EOF,0);
CloseFile(FDataFile);
except
bRetvar := false;
end;
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Result := bRetvar;
end;
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end.
This class will produce an Excel Spreadsheet from a TDataSet. No OLE is required or Excel Installation needed to create the file. The one problem with Excel OLE is that is tends to be rather Sloooow. The class uses standard Delphi I/O functions and is considerably faster than the OLE calls.
Example.
var XL : TDataSetToExcel;
begin
XL := TDataSetToExcel.Create(MyQuery,'c:\temp\test.xls');
XL.WriteFile;
XL.Free;
end;
The columns are neatly sized, Numerics are formatted in "Courier" and obey "###,###,##0.00" for floats and "0" for integers. Dates are formatted "dd-MMM-yyyy hh:nn:ss". Column headers are in Bold and are boxed and shaded.
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