Solved

Get JPG from url

Posted on 2008-11-03
3
298 Views
Last Modified: 2012-05-05
I need to get a  JPG from url  (Example:  www.test.com/test.jpg) and place it in a TJPeg Object (without first saving it to file). Is this possible?

Is so, can you provide me the code please?

Thanks
0
Comment
Question by:geocoins-software
  • 2
3 Comments
 

Author Comment

by:geocoins-software
ID: 22867442
NOTE: Must handle JPEGs that do not actually exist.  (possibly returning a nil object - OR - a boolean)

thanks
0
 
LVL 13

Accepted Solution

by:
ThievingSix earned 500 total points
ID: 22870935
The code below should work.

Here is an example of how to use it:

procedure TForm1.Button1Click(Sender: TObject);
var
  JPEG : TJPEGImage;
  Data : TMemoryStream;
begin
  Data := TMemoryStream.Create;
  Try
    JPEG := TJPEGImage.Create;
    Try
      If Not(GetInetFile('http://www.test.com/phoenix/images/5_top3pic1.jpg',Data)) Then Exit;
      Data.Position := 0;
      JPEG.LoadFromStream(Data);
      Image1.Picture.Graphic := JPEG;
    Finally
      JPEG.Free;
    end;
  Finally
    Data.Free;
  end;
end;

Uses WinInet;
 
function GetInetFile(const FileURL: String; OutStream: TMemoryStream): Boolean;
const
  BufferSize = 1024;
var
  hSession, hURL: HInternet;
  Buffer: Array[1..BufferSize] Of Byte;
  BufferLen: DWORD;
  sAppName: String;
begin
  Result := false;
  sAppName := ExtractFileName(Application.ExeName);
  hSession := InternetOpen(PChar(sAppName),INTERNET_OPEN_TYPE_PRECONFIG,nil,nil,0);
  Try
    hURL := InternetOpenURL(hSession,PChar(fileURL),nil,0,0,0);
    Try
      OutStream.Position := 0;
      Repeat
        InternetReadFile(hURL,@Buffer,SizeOf(Buffer),BufferLen);
        OutStream.Write(Buffer,BufferLen);
      Until BufferLen = 0;
      If OutStream.Size = 0 Then Exit;
      Result := True;
    Finally
      InternetCloseHandle(hURL);
    end
  Finally
    InternetCloseHandle(hSession);
  end
end;

Open in new window

0
 
LVL 13

Expert Comment

by:ThievingSix
ID: 22871116
Oops, this should fix it for non existing images.
function GetInetFile(const FileURL: String; OutStream: TMemoryStream): Boolean;
const
  BufferSize = 1024;
var
  hSession, hURL: HInternet;
  Buffer: Array[1..BufferSize] Of Byte;
  BufferLen: DWORD;
  FileSize: PDWORD;
  Reserved: DWORD;
  sAppName: String;
begin
  Result := false;
  sAppName := ExtractFileName(Application.ExeName);
  hSession := InternetOpen(PChar(sAppName),INTERNET_OPEN_TYPE_PRECONFIG,nil,nil,0);
  Try
    hURL := InternetOpenURL(hSession,PChar(fileURL),nil,0,INTERNET_FLAG_IGNORE_REDIRECT_TO_HTTP Or INTERNET_FLAG_NO_AUTO_REDIRECT,0);
    Try
      BufferLen := 4;
      OutStream.Position := 0;
      Repeat
        FillChar(Buffer,SizeOf(Buffer),0);
        InternetReadFile(hURL,@Buffer,SizeOf(Buffer),BufferLen);
        OutStream.Write(Buffer,BufferLen);
      Until BufferLen = 0;
      If OutStream.Size = 0 Then Exit;
      Result := True;
    Finally
      InternetCloseHandle(hURL);
    end
  Finally
    InternetCloseHandle(hSession);
  end
end;

Open in new window

0

Featured Post

PRTG Network Monitor: Intuitive Network Monitoring

Network Monitoring is essential to ensure that computer systems and network devices are running. Use PRTG to monitor LANs, servers, websites, applications and devices, bandwidth, virtual environments, remote systems, IoT, and many more. PRTG is easy to set up & use.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Introduction The parallel port is a very commonly known port, it was widely used to connect a printer to the PC, if you look at the back of your computer, for those who don't have newer computers, there will be a port with 25 pins and a small print…
A short tutorial showing how to set up an email signature in Outlook on the Web (previously known as OWA). For free email signatures designs, visit https://www.mail-signatures.com/articles/signature-templates/?sts=6651 If you want to manage em…
Finds all prime numbers in a range requested and places them in a public primes() array. I've demostrated a template size of 30 (2 * 3 * 5) but larger templates can be built such 210  (2 * 3 * 5 * 7) or 2310  (2 * 3 * 5 * 7 * 11). The larger templa…

778 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question