If I understand it correctly, TImage.LoadFromFile
determines the type of picture from the file extension.
Is there any way to detect the image type automatically from a TBlobStream
with a raw image in it?
My current code:
procedure LoadImageFromStream(AImage: TImage; ADataSet: TDataSet);
var
Stream: TStream;
begin
Stream := ADataSet.CreateBlobStream(Field, bmRead);
try
AImage.Picture.Graphic.LoadFromStream(Stream);
finally
Stream.Free;
end;
end
See this SO answer for file content retrieval from header.
Or you can use our TSynPicture
class, which will handle all kind of pictures (bmp/gif/tiff/jpg/png) using Gdi+ library, in one single class. So your TPicture
can be this unique class, for any kind of picture. With less code overhead than the Jpeg or PNG Delphi units.
var Pic: TSynPicture;
Pic := TSynPicture.Create;
Pic.LoadFromStream(aStream); // will load bmp/gif/tiff/jpeg/png content
AImage.Picture.Graphic := Pic;
....