问题
I have some image-files stored into one file (some kind of archive). That file looks like this:
Well, it's separated into two segments - header and data-segment. Header (green) contains various info, such as album name, location, date/time, description, number of photos in the album, etc. Data segment (blue & orange) has simple structure and it contains N x JPEG photo. I can extract that "imagedata" segment into new TMemoryStream object and now I want to show it using TImage.
I can use SaveAsFile method of TMemoryStream, set some temporary file-name, load that file from TImage, and later, remove temporary file. That works, but I'm wondering is there any way to send that stream into TImage w/out using temp. files.
Of course, I can write code to extract all those files on hard disk but problem is that I have a lot of archives like this one and just want to write application to read those "albums" instead of having 20,000+ photos on my hard drive.
In short, all I want is to make following procedure works (w/out using temp. files)
procedure ShowImageFromStream(data: TStream; img: TImage);
begin
...
end;
Thanks in advance.
回答1:
I'm not sure if that's what you are looking for, but this code should load the JPEG file from stream into the given TImage component:
uses
JPEG;
procedure ShowImageFromStream(AImage: TImage; AData: TStream);
var
JPEGImage: TJPEGImage;
begin
AData.Position := 0;
JPEGImage := TJPEGImage.Create;
try
JPEGImage.LoadFromStream(AData);
AImage.Picture.Assign(JPEGImage);
finally
JPEGImage.Free;
end;
end;
来源:https://stackoverflow.com/questions/10200252/jpeg-data-stream-to-timage