mail::account::readMessageContent — Read messages


#include <libmail/mail.H>
#include <libmail/envelope.H>
#include <libmail/structure.H>

class myCallbackMessage : public mail::callback::message {
    void success(std::string msg);
    void fail(std::string msg);

    void messageEnvelopeCallback(size_t messageNumber,
                                 const mail::envelope &envelopeArg);

    void messageReferencesCallback(size_t messageNumber,
                                   const std::vector<std::string> &referencesArg);

    void messageArrivalDateCallback(size_t messageNumber,
                                    time_t datetime);

    void messageSizeCallback(size_t messageNumber,
                             unsigned long size);

    void messageStructureCallback(size_t messageNumber,
                                  const mail::mimestruct &messageStructure);
    void messageTextCallback(size_t messageNumber, std::string text);

std::cout << (float)myMessageCallback.messageTextCompleted /
             (float)myMessageCallback.messageTextEstimatedSize * 100
          << "% completed." << endl;

mail::account *account;

account->readMessageContent( const std::vector<size_t> &msgList,
  bool peek,
  mail::readMode requestType,
  myCallbackMessage &callback);
account->readMessageContent( size_t messageNum,
  bool peek,
  mail::mimestruct &msginfo,
  mail::readMode requestType,
  myCallbackMessage &callback);


mail::account::readMessagesContent reads messages in the currently open folder. There are two alternative versions of this method.

  • The first version receives a list of message numbers. msgList specifies a list of messages. Messages are numbered starting with message #0 and up to one less than mail::account::getFolderIndexSize(3x)() (when mail::account::getFolderIndexSize returns 6, the messages are numbered 0 through 5). Only the messages that appear in msgList are processed by this request. This version is capable of returning headers and/or content of multiple messages.

  • The second version receives a single message number, and a mail::mimestruct object that refers to a single MIME attachment or a section of this message. The mail::account::MIMESTRUCTURE argument to mail::account::readMessageAttributes(3x) returns a recursive tree of mail::mimestruct objects which enumerates the individual MIME sections in the message. msgInfo must be a reference to one of these objects (or to a copy of these objects).

Setting peek to true does not reset the unread message status flag for this message. Otherwise the unread message status flag will be reset.


The application is notified about when a message's status changes by by invoking the messageChanged callback method of the currently opened folder's mail::folderCallback object. Depending on the mail server, the messageChanged method may be invoked as part of processing this request, or some time later after this request is completed, and callback's success method was invoked.

The mail::callback::message::messageTextCallback method receives the requested content, which is determined by the remaining parameters.

requestType identifies the type of information to return from the selected MIME section, and must be set to one of the following values:

The callback method may not receive the entire requested content at once. Typically the method will be invoked multiple times; each time the method receives the next portion of the requested content. When requesting headers and/or content of multiple messages, they may be returned in any order, and the messageNumber parameter indicates which message's contents are being returned (note, however, that the entire contents of a given message are returned in their entirety, even when the callback method gets invoked multiple times for that message, before content from the next message are returned).


Return only the headers of the MIME section. Folded headers are unfolded (the newline and the leading space on the next line are replaced with a single space character).


Return only the headers of the MIME section. The headers are returned as-is, without unfolding them.


Return the content of the MIME section.


The MIME section is not decoded. Check the Content-Transfer-Encoding header to know what you're getting.


Return the entire MIME section, as is: its headers, a blank line, then the contents.

Return Codes

The application must wait until callback's success or fail method is invoked. The success method is invoked when this request is succesfully processed. The fail method is invoked if this request cannot be processed. The application must not destroy callback until either the success or fail method is invoked.


callback's fail method may be invoked even after other callback methods were invoked. This indicates that the request was partially completed before the error was encountered.


Multiple applications may have the same account and folder opened at the same time. It is possible that a message referenced by this request was already deleted by another application. Depending on the underlying server implementation this will result in either a failed request, invoking, or the request completing (callback.success invoked) but without invoking any callback function that refer to the message.