Hello, It is not always -1. Once you feed the data it won't be -1 anymore and if local data storage is set to enabled (IMPORTANT!) it will stay > 0 between runs. Use QuoteTracker plugin source code included in the ADK.
LastBar update date is the datetime of Quotes[ nLastValid ] (provided that nLastValid > 0 ) Best regards, Tomasz Janeczko amibroker.com ----- Original Message ----- From: "Sachin" <[EMAIL PROTECTED]> To: <amibroker@yahoogroups.com> Sent: Tuesday, October 02, 2007 1:06 PM Subject: [amibroker] Re: Data Plugin / Preserve Database > What about nLastValid on startup of the plugin , which is always -1. > How does it know which is the last bar updated and which bar to update > next. Even on exiting the Preferences menu nLastValid is set to -1 > when GetQuotes is called. > > Help TJ. > > > > --- In amibroker@yahoogroups.com, "Tomasz Janeczko" <[EMAIL PROTECTED]> wrote: >> >> Hello, >> >> It is automatically saved. You need to go to File->Database Settings >> and define number of bars to be preserved there. >> And make sure that "Local data storage" is set to "Enabled. >> >> Best regards, >> Tomasz Janeczko >> amibroker.com >> ----- Original Message ----- >> From: "Sachin" <[EMAIL PROTECTED]> >> To: <amibroker@yahoogroups.com> >> Sent: Tuesday, October 02, 2007 9:14 AM >> Subject: [amibroker] Data Plugin / Preserve Database >> >> >> > How to make AB preserve a database for a streaming real time source >> > which does not support backfill/hist. data from the remote server and >> > depends on the current price to build the database and is updated >> > using ::SendMessage(ParentWn,WM_USER_STREAMING_UPDATE... -> GetQuotes >> > Mechanism and not the Timer mechanism ? >> > >> > When writing a RT data plugin nLastValid always is -1 when GetQuotes >> > is called for the first time so automatically on startup the previous >> > quotes are deleted >> > >> > also >> > >> > when the timer event fires periodically ( Preferences -> Intraday -> >> > Realtime chart refresh ) again GetQuotes is called with the value of >> > nLastValid as -1. >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > >> > Please note that this group is for discussion between users only. >> > >> > To get support from AmiBroker please send an e-mail directly to >> > SUPPORT {at} amibroker.com >> > >> > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: >> > http://www.amibroker.com/devlog/ >> > >> > For other support material please check also: >> > http://www.amibroker.com/support.html >> > >> > Yahoo! Groups Links >> > >> > >> > >> > >> > >> > > > > > Please note that this group is for discussion between users only. > > To get support from AmiBroker please send an e-mail directly to > SUPPORT {at} amibroker.com > > For NEW RELEASE ANNOUNCEMENTS and other news always check DEVLOG: > http://www.amibroker.com/devlog/ > > For other support material please check also: > http://www.amibroker.com/support.html > > Yahoo! Groups Links > > > > >