BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Detecing origin of messages          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Vesty Guest Posted: Tue Jan 03, 2006 8:15 pm    Post subject: Detecing origin of messages Howdy folks, Is it possible in an application to detect the origin of window messages? For example, if someone sends a message to my application using SendMessage is there any way I can tell the difference between that and a message that was generated internally in my program? Any tips appreciated, -- Vesty. Back to top Alan Bellingham Guest Posted: Tue Jan 03, 2006 9:44 pm    Post subject: Re: Detecing origin of messages "Vesty" <no (AT) email (DOT) com> wrote: Quote: Is it possible in an application to detect the origin of window messages? For example, if someone sends a message to my application using SendMessage is there any way I can tell the difference between that and a message that was generated internally in my program? Any tips appreciated, Well, you can try checking the bits in the message - all bits come with a signature denoting the address whereat they were generated *grin* More seriously, the answer is no. In principle it should not matter where the message comes from. In practice - what do you need to know? If you're trying to make an application secure under Windows, then you must assume that all messages are malicious. Alan Bellingham -- Team Thai Kingdom <url:http://www.borland.com/newsgroups/> Borland newsgroup descriptions <url:http://www.borland.com/newsgroups/netiquette.html> netiquette Back to top Remy Lebeau (TeamB) Guest Posted: Tue Jan 03, 2006 10:28 pm    Post subject: Re: Detecing origin of messages "Vesty" <no (AT) email (DOT) com> wrote Quote: Is it possible in an application to detect the origin of window messages? For example, if someone sends a message to my application using SendMessage is there any way I can tell the difference between that and a message that was generated internally in my program? Sorry, but the API does not provide anything for that. Gambit Back to top Bruce Salzman Guest Posted: Wed Jan 04, 2006 2:33 pm    Post subject: Re: Detecing origin of messages I'm not sure if this will help you, but you can associate an id with a thread using SetMessageExtraInfo() that you can retrieve with GetMessageExtraInfo(). -- Bruce Back to top Bruce Salzman Guest Posted: Wed Jan 04, 2006 3:30 pm    Post subject: Re: Detecing origin of messages "Boba" <Boba (AT) somewhere (DOT) world> wrote Quote: Bruce, I didn't see your reply tstamped as 6:33 am on my pc: I wouldn't have posted mine at 8:44 am. This makes me ask a question: what is the message 'time sent' for news servers? is it local tstamp? Boba I think they are stored in UT on the server and translated locally by our newsreaders. Looking at the time stamps mine was sent at (4 Jan 2006 06:31:08 -0700) and yours at (4 Jan 2006 06:38:16 -0700) About 7 min. apart--maybe just missing the refresh in your newsreader. Cheers, Bruce Back to top Alan Bellingham Guest Posted: Wed Jan 04, 2006 3:42 pm    Post subject: Re: Detecing origin of messages "Boba" <Boba (AT) somewhere (DOT) world> wrote: Quote: I wouldn't have posted mine at 8:44 am. This makes me ask a question: what is the message 'time sent' for news servers? is it local tstamp? Boba If the sender doesn't set a timestamp, then the first server that deals with it should. And the timestamp should, of course, indicate the time zone. For instance, your message was marked as: Date: Wed, 4 Jan 2006 08:58:55 -0800 which I see as 04/01/2006 16:58:55. Bruce's message, interestingly, had a different timezone. Since both your messages arrived via the same single news server, one knows that at least one of your clients is correctly adding the timestamp itself - and probably both. The time associated with a message is usually that of the client PCs, rather than that of the server. This does mean that any PC with an incorrectly set clock (e.g. anyone with a Windows PC who accepts the default time zone without actually being in that timezone, for example) will have misdated messages. (There are also propagation issues - anyone who assumes that they will see a newsgroup message instantly is naive or deluded.) Alan Bellingham -- ACCU Conference 2006 - 19-22 April, Randolph Hotel, Oxford, UK Back to top Alan Bellingham Guest Posted: Wed Jan 04, 2006 4:27 pm    Post subject: Re: Detecing origin of messages "Boba" <Boba (AT) somewhere (DOT) world> wrote: Quote: does make sence to me. But what I can't figure out is according to Bruce our messages on his system are shown as 7 min apart. My pc says: Bruce's post - 6:33 am Boba's - 8:58 am If all (or at least most of) time zones boundaries are based on int hour values, how could the gap on my system become 15 min? Could it be what you call a propagation issue? Oh, sorry, your _second_ message was the 8:58 one. But your client isn't continually asking the server "Got any more messages?". It's quite likely set to a 10 minute or longer refresh period, to avoid overloading servers. In general - just don't worry about it. If your reply was within a short period (an hour or two, say) of the first one, then the assumption should be that the other hadn't got to you yet. If it's several hours, or even days, weeks, months, then it does look silly. If you're still worried after that, then you could always do a manual refresh just before posting. Alan Bellingham -- ACCU Conference 2006 - 19-22 April, Randolph Hotel, Oxford, UK Back to top Boba Guest Posted: Wed Jan 04, 2006 4:44 pm    Post subject: Re: Detecing origin of messages "Vesty" <no (AT) email (DOT) com> wrote Quote: ... is there any way I can tell the difference between that and a message that was generated internally in my program? ... I would SetMessageExtraInfo in every threads' message queue for that. Boba Back to top Boba Guest Posted: Wed Jan 04, 2006 4:58 pm    Post subject: Re: Detecing origin of messages Bruce, I didn't see your reply tstamped as 6:33 am on my pc: I wouldn't have posted mine at 8:44 am. This makes me ask a question: what is the message 'time sent' for news servers? is it local tstamp? Boba Back to top Boba Guest Posted: Wed Jan 04, 2006 5:45 pm    Post subject: Re: Detecing origin of messages " Bruce Salzman" <bruce (AT) nospam (DOT) org> wrote Quote: I think they are stored in UT on the server and translated locally by our newsreaders. Looking at the time stamps mine was sent at (4 Jan 2006 06:31:08 -0700) and yours at (4 Jan 2006 06:38:16 -0700) About 7 min. apart--maybe just missing the refresh in your newsreader. Cheers, Bruce thanks! Back to top Boba Guest Posted: Wed Jan 04, 2006 6:17 pm    Post subject: Re: Detecing origin of messages "Alan Bellingham" <alanb (AT) episys (DOT) com> wrote Quote: If the sender doesn't set a timestamp, then the first server that deals with it should. And the timestamp should, of course, indicate the time zone. For instance, your message was marked as: Date: Wed, 4 Jan 2006 08:58:55 -0800 which I see as 04/01/2006 16:58:55. Bruce's message, interestingly, had a different timezone. Since both your messages arrived via the same single news server, one knows that at least one of your clients is correctly adding the timestamp itself - and probably both. The time associated with a message is usually that of the client PCs, rather than that of the server. This does mean that any PC with an incorrectly set clock (e.g. anyone with a Windows PC who accepts the default time zone without actually being in that timezone, for example) will have misdated messages. (There are also propagation issues - anyone who assumes that they will see a newsgroup message instantly is naive or deluded.) Alan Bellingham does make sence to me. But what I can't figure out is according to Bruce our messages on his system are shown as 7 min apart. My pc says: Bruce's post - 6:33 am Boba's - 8:58 am If all (or at least most of) time zones boundaries are based on int hour values, how could the gap on my system become 15 min? Could it be what you call a propagation issue? Back to top Boba Guest Posted: Wed Jan 04, 2006 6:52 pm    Post subject: Re: Detecing origin of messages it's not about the way the posts show on a screen, i'm trying to figure out how the system marks'em. Thanks. Back to top Vesty Guest Posted: Wed Jan 04, 2006 8:11 pm    Post subject: Re: Detecing origin of messages Vesty wrote: Quote: Howdy folks, Is it possible in an application to detect the origin of window messages? For example, if someone sends a message to my application using SendMessage is there any way I can tell the difference between that and a message that was generated internally in my program? Any tips appreciated, Thanks for the responses. Was more out of curiosity than anything, but thanks all the same. -- Vesty. Back to top JD Guest Posted: Thu Jan 05, 2006 12:37 am    Post subject: Re: Detecing origin of messages Alan Bellingham <alanb (AT) episys (DOT) com> wrote: Quote: [...] The time associated with a message is usually that of the client PCs, rather than that of the server. I always use the web interface (readers are just too busy for my taste) and my messages are stamped by my ISP's server. ~ JD Back to top Display posts from previous: All Posts1 Day7 Days2 Weeks1 Month3 Months6 Months1 Year Oldest FirstNewest First         BorlandTalk.com Forum Index -> C++ Builder (Native API) All times are GMT Page 1 of 1   Jump to: Select a forum C++ Builder Newsgroups----------------C++ BuilderC++ Builder (ActiveX)C++ Builder (Announcements)C++ Builder (Command Line Tools)C++ Builder DatabasesC++ Builder Databases (ADO)C++ Builder Databases (Desktop)C++ Builder Databases (InterBase Express)C++ Builder Databases (Multi-Tier)C++ Builder Databases (SQL Servers)C++ Builder (Graphics)C++ Builder (IDE)C++ Builder (Internet)C++ Builder (Internet Socket)C++ Builder (Internet Web)C++ Builder (Jobs)C++ Builder (Language)C++ Builder (Language C++)C++ Builder (Compatibility with MFC)C++ Builder (Native API)C++ Builder (Non-Technical)C++ Builder (Students)C++ Builder (Third Party Tools)C++ Builder (Upgrade)C++ Builder (VCL)C++ Builder (VCL Components Usage)C++ Builder (VCL Components Development)C++ Builder (VCL Usage)C++ Builder (WinAPI)C++ Builder Installation Delphi Newsgroups----------------Delphi (General)Delphi ActiveX Controls UsageDelphi ActiveX Controls DevelopmentDelphi As400Delphi DatabasesDelphi Databases (ADO)Delphi Databases (dbExpress)Delphi Databases (Desktop)Delphi Databases (InterBase Express)Delphi Databases (Multi-Tier)Delphi Databases (SQL Servers)Delphi DeploymentDelphi GraphicsDelphi IDEDelphi InternationalizationDelphi InternetDelphi Internet Isapi-WebBrokerDelphi Internet WebSnapDelphi Internet WinsockDelphi JobsDelphi Language BASMDelphi Language ObjectPascalDelphi Model Driven Architecture (General)Delphi Model Driven Architecture (Third Party)Delphi MultimediaDelphi Native APIDelphi Non-TechnicalDelphi ObjectPascalDelphi OLE AutomationDelphi OO designDelphi OpenToolsAPIDelphi Reporting-ChartingDelphi RTLDelphi StudentsDelphi TeamSourceDelphi Thirdparty ToolsDelphi Thirdparty Tools (General)Delphi Thirdparty Tools (IntraWeb)Delphi Thirdparty Tools (RaveReports)Delphi UpgradeDelphi VCLDelphi VCL ComponentsDelphi VCL Components UsingDelphi VCL Components WritingDelphi WebServices SOAPDelphi WinAPIDelphi XMLDelphi Installationcomp.lang.pascal.delphi.components.misccomp.lang.pascal.delphi.components.usagecomp.lang.pascal.delphi.components.writingcomp.lang.pascal.delphi.databasescomp.lang.pascal.delphi.misccomp.sources.delphi JBuilder Newsgroups----------------JBuilderJBuilder AnnouncementsJBuilder Applet IssuesJBuilder As400JBuilder CompilerJBuilder CORBA/RMIJBuilder DatabasesJBuilder DB SwingJBuilder DebuggerJBuilder DeploymentJBuilder DocumentationJBuilder EnterpriseJBuilder HandheldJBuilder IDEJBuilder JavaJBuilder JavaAPIJBuilder Java LanguageJBuilder Java SwingJBuilder Java BeansJBuilder Java Beans UsageJBuilder Java Beans DevelopmentJBuilder JBCLJBuilder JDataStoreJBuilder JobsJBuilder LinuxJBuilder MacintoshJBuilder & MobileSetJBuilder MultiLingual AppsJBuilder Non-TechnicalJBuilder OpenToolsJBuilder Servlets (JSP)JBuilder StudentsJBuilder Team DevelopmentJBuilder Thirdparty ToolsJBuilder UpgradeJBuilder Installation InterBase Newsgroups----------------InterBaseInterBase Bug DiscussionInterBase GeneralInterBase IBConsoleInterBase OpenSourceInterBase ReplicationInterBase SQLInterBase ThirdpartyInterBase Installation Miscellaneous Borland Newsgroups----------------AppCenterAppServerEnteraVisiBroker  You cannot post new topics in this forum You cannot reply to topics in this forum You cannot edit your posts in this forum You cannot delete your posts in this forum You cannot vote in polls in this forum Powered by phpBB © 2001, 2006 phpBB Group SEO toolkit © 2004-2006 webmedic.