Delphi DLL

Fetch an IMAP Attachment into a BinData

Demonstrates the Chilkat Imap.FetchAttachmentBd method, which stores one attachment's bytes in a BinData object. The first argument is the Email, the second is the zero-based attachment index, and the third is the BinData, which is cleared before the operation. This example fetches the first attachment and prints its byte count.

Background: A BinData holds raw bytes, so it works for any attachment type — image, PDF, zip, and so on. From there you can save it, hash it, or hand it to another API expecting a byte buffer, all without touching the filesystem. Use the string/StringBuilder variants only when the attachment is known to be text.

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var
success: Boolean;
imap: HCkImap;
headersOnly: Boolean;
useUid: Boolean;
seqNum: Integer;
email: HCkEmail;
numAttach: Integer;
bd: HCkBinData;

begin
success := False;

//  Demonstrates the Imap.FetchAttachmentBd method, which downloads one attachment's bytes into
//  a BinData object.  The 1st argument is the Email, the 2nd is the zero-based attachment
//  index, and the 3rd is the BinData (which is cleared first).
//  
//  The message is fetched headers-only, then the attachment is downloaded on demand.

imap := CkImap_Create();

CkImap_putSsl(imap,True);
CkImap_putPort(imap,993);

success := CkImap_Connect(imap,'imap.example.com');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;
success := CkImap_Login(imap,'user@example.com','myPassword');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

success := CkImap_SelectMailbox(imap,'Inbox');
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

//  Fetch only the message headers.  Attachment bodies are NOT downloaded, but the ckx-imap-*
//  metadata describing the attachments is present, so the attachment info methods still work.
headersOnly := True;
useUid := False;
seqNum := 1;
email := CkEmail_Create();
success := CkImap_FetchEmail(imap,headersOnly,seqNum,useUid,email);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

numAttach := CkImap_GetMailNumAttach(imap,email);
if (numAttach > 0) then
  begin
    //  Download just the first attachment's bytes from the server into a BinData.
    bd := CkBinData_Create();
    success := CkImap_FetchAttachmentBd(imap,email,0,bd);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkImap__lastErrorText(imap));
        Exit;
      end;
    Memo1.Lines.Add('Attachment size: ' + IntToStr(CkBinData_getNumBytes(bd)) + ' bytes');
  end;

success := CkImap_Disconnect(imap);
if (success = False) then
  begin
    Memo1.Lines.Add(CkImap__lastErrorText(imap));
    Exit;
  end;

CkImap_Dispose(imap);
CkEmail_Dispose(email);
    CkBinData_Dispose(bd);