How to display Jpg in DbImage Field

[rencarnacion]

Hello, I need some help with dbimage Field and the problem is when I try to show a jpg in a dbimage I got the Following Error "Bitmap image is not valid."

I'm using bmp I'm just Using Jpg.

It's mean that Unigui Can display BMP ?

 

Thanks for you help 

 

Delphi XE2

Unigui 0.93

 

 

[AlbertoVesx]

Zilav shared this

 

"You are writing for a web browser. Just drop an image file somewhere and link to it with <img src=...> tag, thats all. Browser knows about image formats way more than you.
That ShowImage procedure is the worst piece of code for web. So much mess for doing so little.
It's only usefulness is when app needs to work with both web and VCL the same way. If it is not your aim, don't do that.

Don't forget to add some random value at the end of url like "image.jpg?3554356756756" so the image won't be loaded from browser's cache the next time it is refreshed."

 

procedure TMainForm.SetImageUrl(BlobFld: TField; UniImage: TUniImage; fileName: String);
var
   Tmp,TmpFile:String;
begin
   Tmp:= 'Tmp_' +UnitName +IntToStr(BlobFld.DataSet.RecNo) +fileName;
   TmpFile:= UniServerModule.LocalCachePath +Tmp;
   if (not FileExists(PChar(TmpFile))) then
      TBlobField(BlobFld).SaveToFile(PChar(TmpFile));
   try
      UniImage.Url:= '';
      UniImage.Refresh;
      UniImage.Url:= UniServerModule.LocalCacheURL +Tmp;
   except
   end;
end;

 

[ganzqgy]

//读取数据库图片数据
procedure TuDBGridFrame.UniDBGrid1CellClick(Column: TUniDBGridColumn);// UniGUIAbstractClasses
var
  jpegimage: tjpegimage;
  bmpimage: TBitMap;
  BlobStream: TStream;
  Buffer: WORD;
begin
  with ADOTable1 do
  begin
    if (not fieldbyname('photo').IsNull) then // 字段无内容
    begin
      BlobStream := CreateBlobStream(fieldbyname('photo'), bmRead);
      BlobStream.Position := 0;
      BlobStream.ReadBuffer(Buffer, 2); // 读取文件前２个字节
      BlobStream.Position := 0;
      if Buffer = $4D42 then
// $4D42'BMP'$D8FF'JPEG'$4947 'GIF'$050A'PCX'$5089 'PNG'$4238'PSD'$A659'RAS'$DA01'SGI'$4949'TIFF'
      begin
        bmpimage := TBitMap.Create;
        try
          bmpimage.LoadFromStream(BlobStream);
          UniImage1.Picture.bitmap.Assign(bmpimage);
          UniImage1.Visible := true;
        finally
          bmpimage.Free;
          BlobStream.Free;
        end;
      end;
      if Buffer = $D8FF then // 如果前两个字节是以D8FF[JPG]
      begin
        jpegimage := tjpegimage.Create;
        try
          jpegimage.LoadFromStream(BlobStream);
          UniImage1.Picture.Assign(jpegimage);
          UniImage1.Visible := true;
        finally
          jpegimage.Free;
          BlobStream.Free;
        end;
      end;
    end
    else
      UniImage1.Visible := False;
  end;
end;