How can I read email with HTML format in a Delphi application?

问题

I have created a program that can read email from Exchange 2007. However, it can only read the body of the email in plain-text format. When I tried to retrieve email in HTML format, my software cannot read the body and it always blank. I am using Delphi 2007 and IMAP 9.

Update:

Here is my code:

procedure TForm1.tmrCekTimer(Sender: TObject);
var
  TheFlags: TIdMessageFlagsSet;
  TheUID: string;
  TheMsg: TIdMessage;
  MailBoxName: string;
  MyClass: TComponent;
begin
  MailBoxName := 'INBOX';
  if TheImap.SelectMailBox(MailBoxName) = False then
  begin
    Screen.Cursor := crDefault;
    ShowMessage('Error selecting '+MailBoxName);
    Exit;
  end;
  TheMsg := TIdMessage.Create(nil);
  nCount := TheImap.MailBox.TotalMsgs;
  TheMsg.ContentType := 'multipart/alternative';
  TheMsg.Encoding := meMime;
  if nCount = 0 then begin
    StringGrid1.RowCount := 2;
    StringGrid1.Cells[0, 1] := '';
    StringGrid1.Cells[1, 1] := '';
    StringGrid1.Cells[2, 1] := '';
    StringGrid1.Cells[3, 1] := '';
    ShowMessage('There are no messages in '+MailBoxName);
  end else begin
    StringGrid1.RowCount := nCount + 1;
    for i := 0 to nCount-1 do begin
      TheImap.GetUID(i+1, TheUID);
      TheImap.UIDRetrieveFlags(TheUID, TheFlags);
      TheImap.UIDRetrieve(TheUID, TheMsg);
      //TheImap.UIDRetrieveHeader(TheUID, TheMsg);
      StringGrid1.Cells[0, i+1] := IntToStr(i+1);
      StringGrid1.Cells[1, i+1] := TheMsg.From.Address;
      //StringGrid1.Cells[1, i+1] := TheUID;
      if mfSeen in TheFlags then
        StringGrid1.Cells[2, i+1] := 'Yes'
      else begin
        StringGrid1.Cells[2, i+1] := 'No';
      end;
    end;
 end;

回答1:

The contents of MIME-encoded emails, such as HTML emails (if plain-text and/or attachments are also present) are stored in the TIdMessage.MessageParts property, not in the TIdMessage.Body property. You need to look at the email's actual ContentType property to know which property TIdMessage parsed the email into.

回答2:

Using MAPI, I usually try to get the PR_BODY_HTML property as string; if that’s empty, I retrieve the PR_HTML property.

  const
    PR_HTML = $10130102;
    PR_BODY_HTML = $1013001E;

This usually works for me. Of course, maybe you’re using different technology altogether, but you’re not giving us much to work with...

来源：https://stackoverflow.com/questions/5076658/how-can-i-read-email-with-html-format-in-a-delphi-application