Solved

Get JPG from url

Posted on 2008-11-03
3
301 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

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

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

Suggested Solutions

A lot of questions regard threads in Delphi.   One of the more specific questions is how to show progress of the thread.   Updating a progressbar from inside a thread is a mistake. A solution to this would be to send a synchronized message to the…
Creating an auto free TStringList The TStringList is a basic and frequently used object in Delphi. On many occasions, you may want to create a temporary list, process some items in the list and be done with the list. In such cases, you have to…
This video shows how to quickly and easily add an email signature for all users on Exchange 2016. The resulting signature is applied on a server level by Exchange Online. The email signature template has been downloaded from: www.mail-signatures…
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…

821 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