标签：begin end TDS2Excel Excel dataset FDataSet UNICODE FDbGrid procedure
偶尔做界面程序，需要一个导出Excel，而在客户端又不用安装MS Excel的方法，总结如下。
测试了两种方法，第一种方法如下（此方法支持UNICODE不存在问题）：
参考：http://www.swissdelphicenter.ch/torry/showcode.php?id=1427
procedure DBGridToExcelADO(Query: TDataSet; FileName: string; SheetName: string);
var
cat: _Catalog;
tbl: _Table;
col: _Column;
i: integer;
ADOConnection: TADOConnection;
ADOQuery: TADOQuery;
begin
if FileExists(FileName) then // It's better to delete the file first, or there may be a "external table is not in the expected format" error. by genispan
DeleteFile(FileName);
//WorkBook creation (database)
cat := CoCatalog.Create;
//cat._Set_ActiveConnection
cat.Set_ActiveConnection('Provider=Microsoft.Jet.OLEDB.4.0; Data Source=' + FileName + ';Extended Properties=Excel 8.0');
//WorkSheet creation (table)
tbl := CoTable.Create;
tbl.Set_Name(SheetName);
//Columns creation (fields)
Query.First;
with Query.Fields do
begin
for i := 0 to Count - 1 do
begin
col := nil;
col := CoColumn.Create;
with col do
begin
Set_Name(Query.Fields[i].FieldName);
Set_Type_(adVarWChar);
end;
//add column to table
tbl.Columns.Append(col, adVarWChar, 20);
end;
end;
//add table to database
cat.Tables.Append(tbl);
col := nil;
tbl := nil;
cat := nil;
ADOConnection := TADOConnection.Create(nil);
ADOConnection.LoginPrompt := False;
ADOConnection.ConnectionString := 'Provider=Microsoft.Jet.OLEDB.4.0; Data Source=' + FileName + ';Extended Properties=Excel 8.0';
ADOQuery := TADOQuery.Create(nil);
ADOQuery.Connection := ADOConnection;
ADOQuery.SQL.Text := 'Select * from [' + SheetName + '$]';
ADOQuery.Open;
try
with Query do
begin
First;
while not Eof do
begin
ADOQuery.Append;
with Query.Fields do
begin
ADOQuery.Edit;
for i := 0 to Count - 1 do
ADOQuery.FieldByName(Query.Fields[i].FieldName).AsString := FieldByName(Query.Fields[i].FieldName).AsString;
ADOQuery.Post;
end;
Next;
end;
end;
finally
ADOQuery.Close;
ADOConnection.Close;
ADOQuery.Free;
ADOConnection.Free;
end;
end;
第二种方法，此方法效率更高，但导出UNICODE字符串存在问题，如有高手看到可留言帮助解决下，以下为整理好了的pas单元源码：
unit uExcel;
interface
Uses
DB, Classes, Dialogs,DBGrids,Controls;
var
CXlsBof: array[0..5] of Word = ($809, 8, 0, $10, 0, 0);
//OPCode, size, codepage
CXlsCodePage: array[0..2] of Word = ($0042, $0002, $04B0);
CXlsEof: array[0..1] of Word = ($0A, 00);
CXlsLabel: array[0..5] of Word = ($204, 0, 0, 0, 0, 0);
CXlsNumber: array[0..4] of Word = ($203, 14, 0, 0, 0);
CXlsRk: array[0..4] of Word = ($27E, 10, 0, 0, 0);
CXlsBlank: array[0..4] of Word = ($201, 6, 0, 0, $17);
Type
TDS2Excel = Class(TObject)
Private
FCol: word;
FRow: word;
FDataSet: TDataSet;
FDbGrid :TDbGrid;
Stream: TStream;
FWillWriteHead: boolean;
FBookMark: TBookmark;
procedure IncColRow;
procedure WriteBlankCell;
procedure WriteFloatCell(const AValue: Double);
procedure WriteIntegerCell(const AValue: Integer);
procedure WriteStringCell(const AValue: string);
procedure WritePrefix;
procedure WriteSuffix;
procedure WriteTitle;
procedure WriteDataCell;
procedure Save2Stream(aStream: TStream);
Public
procedure Save2File(FileName: string; WillWriteHead: Boolean);
procedure Save2Files(WillWriteHead: Boolean);
Constructor Create(aDataSet: TDataSet;aDBGrid:TDBGrid);
end;
implementation
uses SysUtils;
Constructor TDS2Excel.Create(aDataSet: TDataSet;aDBGrid:TDBGrid);
begin
inherited Create;
FDataSet := aDataSet;
FDbGrid :=aDbGrid;
end;
procedure TDS2Excel.IncColRow;
begin
if FDbGrid <>nil then
begin
if FCol = FDbGrid.Columns.Count - 1 then
begin
Inc(FRow);
FCol :=0;
end
else
Inc(FCol);
end else
begin
if FCol = FDataSet.FieldCount - 1 then
begin
Inc(FRow);
FCol :=0;
end
else
Inc(FCol);
end;
end;
procedure TDS2Excel.WriteBlankCell;
begin
CXlsBlank[2] := FRow;
CXlsBlank[3] := FCol;
Stream.WriteBuffer(CXlsBlank, SizeOf(CXlsBlank));
IncColRow;
end;
procedure TDS2Excel.WriteFloatCell(const AValue: Double);
begin
CXlsNumber[2] := FRow;
CXlsNumber[3] := FCol;
Stream.WriteBuffer(CXlsNumber, SizeOf(CXlsNumber));
Stream.WriteBuffer(AValue, 8);
IncColRow;
end;
procedure TDS2Excel.WriteIntegerCell(const AValue: Integer);
var
V: Integer;
begin
CXlsRk[2] := FRow;
CXlsRk[3] := FCol;
Stream.WriteBuffer(CXlsRk, SizeOf(CXlsRk));
V := (AValue shl 2) or 2;
Stream.WriteBuffer(V, 4);
IncColRow;
end;
procedure TDS2Excel.WriteStringCell(const AValue: string);
var
L: Word;
_str : AnsiString;
begin
_str := AnsiString(AValue); // in delphi XE, there will be error for unicode, fix me !!!!!!!!!!! --by genispan
L := Length(_str);
CXlsLabel[1] := 8 + L;
CXlsLabel[2] := FRow;
CXlsLabel[3] := FCol;
CXlsLabel[5] := L;
Stream.WriteBuffer(CXlsLabel, SizeOf(CXlsLabel));
Stream.WriteBuffer(Pointer(_str)^, L);
IncColRow;
end;
procedure TDS2Excel.WritePrefix;
begin
Stream.WriteBuffer(CXlsBof, SizeOf(CXlsBof));
Stream.WriteBuffer(cxlscodepage, SizeOf(cxlscodepage));
end;
procedure TDS2Excel.WriteSuffix;
begin
Stream.WriteBuffer(CXlsEof, SizeOf(CXlsEof));
end;
procedure TDS2Excel.WriteTitle;
var
n: word;
begin
if FDbGrid <> nil then
for n := 0 to FDBGrid.Columns.Count - 1 do
WriteStringCell(FDBGrid.Columns[n].Title.Caption)
else
for n := 0 to FDataSet.FieldCount - 1 do
WriteStringCell(FDataSet.Fields[n].FieldName);
end;
procedure TDS2Excel.WriteDataCell;
var
n: word;
begin
WritePrefix;
if FWillWriteHead then WriteTitle;
FDataSet.DisableControls;
FBookMark := FDataSet.GetBookmark;
FDataSet.First;
if FDbGrid=nil then
begin
while not FDataSet.Eof do
begin
for n := 0 to FDataSet.FieldCount - 1 do
begin
try
if FDataSet.Fields[n].IsNull then
WriteBlankCell
else begin
case FDataSet.Fields[n].DataType of
ftSmallint, ftInteger, ftWord, ftAutoInc, ftBytes:
WriteIntegerCell(FDataSet.Fields[n].AsInteger);
ftFloat, ftCurrency, ftBCD:
WriteFloatCell(FDataSet.Fields[n].AsFloat);
ftTypedBinary:
else
WriteStringCell(FDataSet.Fields[n].AsString);
end;
end;
except
WriteBlankCell;
end;
end;
FDataSet.Next;
end;
end
else
begin
while not FDbGrid.DataSource.DataSet.Eof do
begin
for n := 0 to FDbGrid.Columns.Count - 1 do
begin
if FDbGrid.Columns[n].Field.IsNull then
WriteBlankCell
else begin
case FDbGrid.Columns[n].Field.DataType of
ftSmallint, ftInteger, ftWord, ftAutoInc, ftBytes:
WriteIntegerCell(FDbGrid.Columns[n].Field.AsInteger);
ftFloat, ftCurrency, ftBCD:
WriteFloatCell(FDbGrid.Columns[n].Field.AsFloat);
else
WriteStringCell(FDbGrid.Columns[n].Field.AsString);
end;
end;
end;
FDbGrid.DataSource.DataSet.Next
end;
end;
WriteSuffix;
if FDataSet.BookmarkValid(FBookMark) then FDataSet.GotoBookmark(FBookMark);
FDataSet.EnableControls;
end;
procedure TDS2Excel.Save2Stream(aStream: TStream);
begin
FCol := 0;
FRow := 0;
Stream := aStream;
WriteDataCell;
end;
procedure TDS2Excel.Save2File(FileName: string; WillWriteHead: Boolean);
var
aFileStream: TFileStream;
begin
FWillWriteHead := WillWriteHead;
if FileExists(FileName) then DeleteFile(FileName);
aFileStream := TFileStream.Create(FileName, fmCreate);
Try
Save2Stream(aFileStream);
Finally
aFileStream.Free;
end;
end;
procedure TDS2Excel.Save2FileS(WillWriteHead: Boolean);
var
SaveDialog11: TSaveDialog;
begin
SaveDialog11 := TSaveDialog.Create(nil);
Try
SaveDialog11.Filter := 'Excel|*.xls';
SaveDialog11.InitialDir := 'C:\';
SaveDialog11.FileName:='*.xls';
if not SaveDialog11.Execute then exit;
if FileExists(SaveDialog11.FileName) then DeleteFile(SaveDialog11.FileName);
Save2File(SaveDialog11.FileName, WillWriteHead);
Finally
SaveDialog11.Free;
end;
end;
end.
标签：begin,end,TDS2Excel,Excel,dataset,FDataSet,UNICODE,FDbGrid,procedure 来源： https://www.cnblogs.com/jijm123/p/16189861.html
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