how to get photo from message with Media type TL_Photo ?

[shelomentsevd]

how to get photo from message with Media type TL_Photo ?

[savely-krasovsky]

@vtolstov you should use upload.getFile method. Of course at first you should get volume_id, local_id and secret.

Example:

res, err := t.mtproto.InvokeSync(mtproto.TL_upload_getFile{
	Location: mtproto.TL_inputFileLocation{
		Volume_id: volumeId,
		Local_id:  localId,
		Secret:    secret,
	},
	Offset: offset,
	Limit:  65536,
})
if err != nil {
	return nil, err
}

switch (*res).(type) {
case mtproto.TL_upload_file:
	return (*res).(mtproto.TL_upload_file).Bytes, nil
}

return nil, errors.New("UNKNOWN TYPE RETURNED")

[vtolstov]

Wow THANKS!

[savely-krasovsky]

@vtolstov there is some problem right now. You could download files only from Data Center that you use. For Russia and CIS Telegram prefers second DC, for example. If you will try to download file from another DC you will get error FILE_MIGRATE_dcNumber.

But contributitions are welcome :)

[vtolstov]

Hmm. i have mtproto.TL_fileLocation and not mtproto.TL_inputFileLocation

[vtolstov]

and i'm from russia =)

[savely-krasovsky]

@vtolstov mtproto.TL_fileLocation you have in answer from Telegram with file. TL_inputFileLocation should used to request it.

[savely-krasovsky]

Example to get fileLocation variables:

if user, ok := res.(mtproto.TL_user); ok {
	if photo, ok := user.Photo.(mtproto.TL_userProfilePhoto); ok {
		if photoSmall, ok := photo.Photo_small.(mtproto.TL_fileLocation); ok {
			return Photo{
				photoSmall.Dc_id
				photoSmall.Volume_id,
				photoSmall.Local_id,
				photoSmall.Secret,
			}
		}
	}
}

And then use it upload.getFile method.