Merci, c'est ce que j'avais essayé de faire mais le je n'ai pas de paramètre à passer à cette méthode (pointeur toujours null)

Mais j'ai peut-être trouvé une piste. Page 82, chapitre 4.2.4

kEdsObjectEvent_DirItemCreated (Notification of file creation)

Notifies of the creation of objects such as new folders or files on a camera compact flash card or the
like.
This event is generated if the camera has been set to store captured images simultaneously on the camera and a computer, for example, but not if the camera is set to store images on the compute alone.
Newly created objects are indicated by event data.

Because objects are not indicated for type 1 protocol standard cameras, (that is, objects are indicated as NULL), you must again retrieve child objects under the camera object to identify the new objects.
le 350D utilise un protocole de type 2 (PTP) mais il y a peut-être un problème de driver. Je vais voir de ce côté là