Converter DBGrid em HTML
Nesta dica, vamos mostrar como transformar em um arquivo HTML, os dados de um DBGrid. Primeiramente, implemente as seguintes functions:
function ColorToHtml(mColor: TColor): string;
function StrToHtml(mStr: string; mFont: TFont = nil): string;
function DBGridToHtmlTable(mDBGrid: TDBGrid; mStrings: TStrings; mCaption: TCaption = ''): Boolean;
Implemente-os com o seguinte código:
function TForm1.ColorToHtml(mColor: TColor): string;
begin
mColor := ColorToRGB(mColor);
Result := Format('#%.2x%.2x%.2x', [GetRValue(mColor), GetGValue(mColor), GetBValue(mColor)]);
end;
function TForm1.DBGridToHtmlTable(mDBGrid: TDBGrid; mStrings: TStrings;
mCaption: TCaption): Boolean;
const
cAlignText: array[TAlignment] of string = ('LEFT', 'RIGHT', 'CENTER');
var
vColFormat: string;
vColText: string;
vAllWidth: Integer;
vWidths: array of Integer;
vBookmark: string;
I, J: Integer;
begin
Result := False;
if not Assigned(mStrings) then Exit;
if not Assigned(mDBGrid) then Exit;
if not Assigned(mDBGrid.DataSource) then Exit;
if not Assigned(mDBGrid.DataSource.DataSet) then Exit;
if not mDBGrid.DataSource.DataSet.Active then Exit;
vBookmark := mDBGrid.DataSource.DataSet.Bookmark;
mDBGrid.DataSource.DataSet.DisableControls;
try
J := 0;
vAllWidth := 0;
for I := 0 to mDBGrid.Columns.Count - 1 do
if mDBGrid.Columns[I].Visible then
begin
Inc(J);
SetLength(vWidths, J);
vWidths[J - 1] := mDBGrid.Columns[I].Width;
Inc(vAllWidth, mDBGrid.Columns[I].Width);
end;
if J <= 0 then Exit;
mStrings.Clear;
mStrings.Add(Format('');
finally
mDBGrid.DataSource.DataSet.Bookmark := vBookmark;
mDBGrid.DataSource.DataSet.EnableControls;
vWidths := nil;
end;
Result := True;
end;
function TForm1.StrToHtml(mStr: string; mFont: TFont): string;
var
vLeft, vRight: string;
begin
Result := mStr;
Result := StringReplace(Result, '&', '&', [rfReplaceAll]);
Result := StringReplace(Result, '<', '<', [rfReplaceAll]);
Result := StringReplace(Result, '>', '>', [rfReplaceAll]);
if not Assigned(mFont) then Exit;
vLeft := Format('',
[mFont.Name, ColorToHtml(mFont.Color)]);
vRight := '';
if fsBold in mFont.Style then
begin
vLeft := vLeft + '';
vRight := '' + vRight;
end;
if fsItalic in mFont.Style then
begin
vLeft := vLeft + '';
vRight := '' + vRight;
end;
if fsUnderline in mFont.Style then
begin
vLeft := vLeft + '';
vRight := '' + vRight;
end;
if fsStrikeOut in mFont.Style then
begin
vLeft := vLeft + '';
vRight := '' + vRight;
end;
Result := vLeft + Result + vRight;
end;
Adicione no formulário um DataSource, um DBGrid, um ClientDataSet, Memo e um botão. Faça as ligações entre os componentes DataSource, DBGrid e ClientDataSet (utilize um arquivo XML). No OnClick do botão digite o seguinte código:
DBGridToHtmlTable(DBGrid1, Memo1.Lines, Caption);
Memo1.Lines.SaveToFile('c:\temp.htm');
ShellExecute(Handle, nil, 'c:\temp.htm', nil, nil, SW_SHOW);
Declare no uses ShellApi. Rode a aplicação e veja o resultado.
Código:
Alexandre de Andrade Gonçalves
Analista/Programador
Luciano Pimenta®
Editor do Portal ClubeDelphi.Net
