mail::account::readTopLevelFolders.3x man page


mail::account::readTopLevelFolders — Enumerate top-level folders


#include <libmail/mail.H>

class myCallback : public mail::callback {
    void success(std::string msg);
    void fail(std::string msg);
class myFolderCallback : public mail::callback::folderlist {
    void success(const std::vector<const mail::folder *> &folders);
mail::account *account;

account->readTopLevelFolders(myFolderCallback &folderCallback, myCallback &callback);


A mail account contains folders that are arranged in a tree-like hierarchy. mail::account::readTopLevelFolders enumerates the folders at the top level of the mail account's hierarchy. The rest of the folders may be enumerated by recursively invoking the mail::folder::readSubFolders(3x) method.

Return Codes and Callbacks

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.


The application must not destroy folderCallback until this request fails or succeeds. folderCallback's success method is invoked just before the callback's success method.

The folderCallback.success method receives a vector of pointers to mail::folder objects, that enumerates the folders at the top level of the mail account's folder hierarchy.


mail::folders are linked to their corresponding mail::accounts. A mail::folder created by one mail::account may not be used with a different mail::folder. All mail::folders created by a mail::account are invalidated when this mail::account object is destroyed. Note that the mail::folder objects are not automatically destroyed; the application is still responsible for destroying any remaining mail::folders, after their a mail::account is destroyed.


The folderCallback.success method receives a (possibly empty) vector of pointers to mail::folder objects. These objects will be destroyed when folderCallback.success terminates. The application must use mail::folder::clone(3x) to create copies of mail::folder objects it wants to use later.


Both folderCallback.success and myCallback.success method will be invoked if this request succeeds. folderCallback.success will be invoked before myCallback.success (since by definition this indicates that the request has been completed).

callback's success method is then invoked, after all mail::folder objects are destroyed.

The list of top-level folders depends on the mail account's type. Local mail accounts have a single folder object representing the locally-configured mail folder directory. inbox and maildir accounts also have a single folder named INBOX. INBOX represents the system mail folder where incoming mail is delivered. pop3 accounts have a single, lonely, INBOX folder. imap accounts have a INBOX folder in addition to top level folders identified by the IMAP server (using the IMAP NAMESPACE extension). IMAP servers that do not explicitly identify folder collections will have a single mail::folder object, representing the root of the IMAP server's namespace.

See Also

mail::folder::readSubFolders(3x), mail::folder::clone(3x)..


Sam Varshavchik


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