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| unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Jpeg, pngimage, GIFImg,
Dialogs, ADODB, DB, Grids, DBGrids, SMDBGrid, ExtCtrls;
type
TFileExtension = Record
eExtension : String;
eImage : TGraphic;
end;
type
TForm1 = class(TForm)
ADOConnection1: TADOConnection;
ADOTblDocuments: TADOTable;
ADOQry: TADOQuery;
SMDBGrid1: TSMDBGrid;
DataSource1: TDataSource;
procedure FormCreate(Sender: TObject);
procedure SMDBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
DataCol: Integer; Column: TColumn; State: TGridDrawState);
private
{ Déclarations privées }
procedure LectureExtension;
public
{ Déclarations publiques }
end;
var
Form1: TForm1;
FileExtension : Array of TFileExtension;
implementation
{$R *.dfm}
procedure TForm1.LectureExtension;
var
n : Integer;
BS: TStream;
Graphic: TGraphic;
FirstBytes: AnsiString;
begin
Graphic := nil;
SetLength(FileExtension,0);
Finalize(FileExtension);
With ADOQry do
begin
Sql.Clear;
Sql.Add('Select * From Extension');
try
Active := True;
SetLength(FileExtension,Recordset.RecordCount);
for n := 0 to High(FileExtension) do
begin
FileExtension[n].eExtension := FieldByName('Extension').AsString;
BS := CreateBlobStream(FieldByName('Image'), bmRead);
try
SetLength(FirstBytes, 8);
BS.Read(FirstBytes[1], 8);
if Copy(FirstBytes, 1, 2) = 'BM' then
begin
Graphic := TBitmap.Create;
end else
if FirstBytes = #137'PNG'#13#10#26#10 then
begin
Graphic := TPngImage.Create;
end else
if Copy(FirstBytes, 1, 3) = 'GIF' then
begin
Graphic := TGIFImage.Create;
end else
if Copy(FirstBytes, 1, 2) = #$FF#$D8 then
begin
Graphic := TJPEGImage.Create;
end;
if Assigned(Graphic) then
begin
try
BS.Seek(0, soFromBeginning);
Graphic.LoadFromStream(BS);
FileExtension[n].eImage.Assign(Graphic);
except
end;
Graphic.Free;
end;
finally
BS.Free;
end;
next;
end;
finally
Close;
end;
end;
end;
procedure TForm1.SMDBGrid1DrawColumnCell(Sender: TObject; const Rect: TRect;
DataCol: Integer; Column: TColumn; State: TGridDrawState);
Var
xRect: TRect;
i: Integer;
begin
With Sender as TSMDBGrid Do With Canvas Do
Begin
if DataSource.DataSet.RecordCount > 0 then
begin
xRect := Rect;
FillRect(xRect);
if Column.FieldName = 'eExtension' then
begin
for I := Low(FileExtension) to High(FileExtension) do
begin
if FileExtension[i].eExtension = DataSource.DataSet.FieldByName('eExtension').AsString then
begin
SMDBGrid1.Canvas.FillRect(xRect);
SMDBGrid1.Canvas.StretchDraw(xRect, FileExtension[0].eImage);
end;
end;
end;
DefaultDrawColumnCell(xRect, DataCol, Column, State);
end;
End;
end;
procedure TForm1.FormCreate(Sender: TObject);
begin
LectureExtension;
end;
end. |
