(Delphi DLL) Parse MIME to get Binary Data (such as GIF, JPG, or any binary file)

Demonstrates how to parse a MIME to get binary data. This example extracts the image data for a GIF image to an in-memory byte array, and also to a file.

This example uses a MIME test file located at http://www.chilkatsoft.com/testData/sampleMime2.txt. It contains the following MIME:

Content-Type: multipart/mixed;
 boundary="------------080707010302060306060800";

This is a multi-part message in MIME format.

--------------080707010302060306060800
Content-Type: text/plain
Content-Transfer-Encoding: 7bit

This is the plain-text body.
--------------080707010302060306060800
Content-Disposition: attachment; filename="starfish.gif";
Content-Transfer-Encoding: base64
Content-Type: image/gif; name="starfish.gif";

R0lGODlhIAAgAPcAAP///+/v7/f39+/n5/fv7//39/fn597OzufW1tbGxs69vffe3u/W1salpZQQ
EIQYEJwQCJQYCJwYCM6clL2Ee5wpGIwhEK0YANatpdalnHMYCKUhCJQYAKUYAM6Ec5QhCJwhCPfW
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--------------080707010302060306060800--

Chilkat for Delphi Downloads Chilkat non-ActiveX DLL for Delphi Chilkat ActiveX DLL for Delphi * The examples here use the non-ActiveX DLL.

uses
    Winapi.Windows, Winapi.Messages, System.SysUtils, System.Variants, System.Classes, Vcl.Graphics,
    Vcl.Controls, Vcl.Forms, Vcl.Dialogs, Vcl.StdCtrls, Mime, FileAccess, CkByteData;

...

procedure TForm1.Button1Click(Sender: TObject);
var
mime: HCkMime;
success: Boolean;
part2: HCkMime;
binaryData: HCkByteData;
fac: HCkFileAccess;

begin
// This example assumes the Chilkat API to have been previously unlocked.
// See Global Unlock Sample for sample code.

mime := CkMime_Create();

// Load the sampleMime2.txt file into the MIME object.
// (This file is available at https://www.chilkatsoft.com/testData/sampleMime2.txt )

success := CkMime_LoadMimeFile(mime,'sampleMime2.txt');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

// The GIF image is the 2nd sub-part located directly under the
// top-level MIME node.  Indexing begins at 0, therefore the 2nd
// sub-part is at index 1.
part2 := CkMime_GetPart(mime,1);

binaryData := CkByteData_Create();

// The GetBodyBinary method returns the binary bytes
// of the part's body, automatically decoded from whatever
// content-transfer-encoding might be used (such as base64).
success := CkMime_GetBodyBinary(part2,binaryData);

// We now have the binary bytes of the GIF image in binaryData.
// Save it to a file.
fac := CkFileAccess_Create();
success := CkFileAccess_WriteEntireFile(fac,'out1.gif',binaryData);
if (success <> True) then
  begin
    Memo1.Lines.Add(CkFileAccess__lastErrorText(fac));
    Exit;
  end;

// An easier way to save the body content to a file,
// assuming your application does not need to access
// the binary data in-memory, is to call SaveBody
success := CkMime_SaveBody(part2,'out2.gif');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(part2));
    Exit;
  end;

CkMime_Dispose(part2);

Memo1.Lines.Add('Finished.');

CkMime_Dispose(mime);
CkByteData_Dispose(binaryData);
CkFileAccess_Dispose(fac);

end;