Delphi DLL

Access a Part in a Multipart MIME Entity

Demonstrates the Chilkat Mime.PartAt method, which provides live access to the direct child at a zero-based index. The first argument is the index and the second is a Mime object that will reference the child. Modifying it modifies the child stored in the parent tree.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

Background: This is how you reach into a multipart message to inspect or edit an individual part — read a part's Content-Type, extract an attachment's body, or change a part in place. The key point is that the returned Mime is a live reference, not a copy, so edits to it flow back into the parent tree. Loop from 0 to NumParts - 1 to visit every direct child.

Chilkat Delphi DLL Downloads

Download Chilkat for Delphi DLL

Delphi DLL

var
success: Boolean;
mime: HCkMime;
n: Integer;
part: HCkMime;
i: Integer;

begin
success := False;

mime := CkMime_Create();
success := CkMime_LoadMimeFile(mime,'qa_data/multipart_message.eml');
if (success = False) then
  begin
    Memo1.Lines.Add(CkMime__lastErrorText(mime));
    Exit;
  end;

//  PartAt provides LIVE access to a direct child part.  The 1st argument is the zero-based index
//  and the 2nd is a Mime object that will reference the child.  Modifying it modifies the child in
//  the parent tree.
n := CkMime_getNumParts(mime);
Memo1.Lines.Add('Number of parts: ' + IntToStr(n));

part := CkMime_Create();

for i := 0 to n - 1 do
  begin
    success := CkMime_PartAt(mime,i,part);
    if (success = False) then
      begin
        Memo1.Lines.Add(CkMime__lastErrorText(mime));
        Exit;
      end;
    Memo1.Lines.Add('Part ' + IntToStr(i) + ' Content-Type: ' + CkMime__contentType(part));
  end;

CkMime_Dispose(mime);
CkMime_Dispose(part);