Delphi DLL

Get the Nth Binary Part of a Content-Type into BinData

Demonstrates the Chilkat Email.GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth MIME sub-part matching a content-type pattern into a BinData object. The arguments are the zero-based index among the matching parts, the content-type pattern, an inlineOnly flag, an excludeAttachments flag, and the BinData that receives the bytes. This example extracts the first image/png part.

Background: This is the binary, type-targeted way to pull a specific part out of a message — ideal for extracting, say, every image/png or the one application/pdf from a complex MIME tree without caring whether it is an attachment, an inline image, or a body part. Reading into a BinData keeps the raw bytes exact, ready to save, hash, or re-transmit.

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var
success: Boolean;
email: HCkEmail;
bdImage: HCkBinData;
bd: HCkBinData;

begin
success := False;

//  Demonstrates the GetNthBinaryPartOfTypeBd method, which loads the binary bytes of the Nth
//  MIME sub-part matching a Content-Type pattern into a BinData object.  The arguments are
//  the zero-based index among matching parts, the Content-Type pattern, inlineOnly,
//  excludeAttachments, and the BinData that receives the bytes.

email := CkEmail_Create();
CkEmail_putSubject(email,'GetNthBinaryPartOfTypeBd example');
CkEmail_putBody(email,'See the attached image.');

//  Load the image from a file into a BinData object and attach it (binary data belongs
//  in a BinData, never in a string).
bdImage := CkBinData_Create();
success := CkBinData_LoadFile(bdImage,'qa_data/images/photo.png');
if (success = False) then
  begin
    Memo1.Lines.Add(CkBinData__lastErrorText(bdImage));
    Exit;
  end;
success := CkEmail_AddAttachmentBd(email,'photo.png',bdImage,'image/png');
if (success = False) then
  begin
    Memo1.Lines.Add(CkEmail__lastErrorText(email));
    Exit;
  end;

//  Load the bytes of the first (index 0) image/png part into a BinData object.
bd := CkBinData_Create();
success := CkEmail_GetNthBinaryPartOfTypeBd(email,0,'image/png',False,False,bd);
if (success = False) then
  begin
    Memo1.Lines.Add(CkEmail__lastErrorText(email));
    Exit;
  end;

Memo1.Lines.Add('image/png part size (bytes) = ' + IntToStr(CkBinData_getNumBytes(bd)));

//  Note: The path "qa_data/images/photo.png" is a relative local filesystem path,
//  relative to the current working directory of the running application.

CkEmail_Dispose(email);
CkBinData_Dispose(bdImage);
CkBinData_Dispose(bd);