BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Strange 'WriteFile' Freezing problem          BorlandTalk.com Forum Index -> C++ Builder (Native API) View previous topic :: View next topic   Author Message Ramy Guest Posted: Thu Jul 20, 2006 9:49 pm    Post subject: Strange 'WriteFile' Freezing problem Please Help, I'm having a very strange problem, sometimes my application is "Freezing" in the following command - WriteFile( hndl, TxBuff, MessageLen, &written, NULL ); (sending data through RS-232 port) sometimes it's happening after 15 seconds, and sometimes after 2 minutes.... I checked the command parameters and they all looks OK, I compared the command parameters (hndl, TxBuff...) when the command works OK, and when it's freezing, and they looks exactly the same..... what can be the problem ?? Thanks! Ramy. Back to top Remy Lebeau (TeamB) Guest Posted: Fri Jul 21, 2006 12:12 am    Post subject: Re: Strange 'WriteFile' Freezing problem "Ramy" <Ramy (AT) NoMail (DOT) com> wrote in message news:44bfb418$1 (AT) newsgroups (DOT) borland.com... Quote: Please Help, I'm having a very strange problem, sometimes my application is "Freezing" in the following command - WriteFile( hndl, TxBuff, MessageLen, &written, NULL ); (sending data through RS-232 port) How much data are you actually sending? What kind of device is on the other end of the port? What kind of timeouts are you using? Have you considered using Overlapped I/O with the port yet? Gambit Back to top Ramy Guest Posted: Sun Jul 23, 2006 4:24 pm    Post subject: Re: Strange 'WriteFile' Freezing problem Hi, the timeouts that I use are the following - read_timeout.ReadIntervalTimeout = 0; read_timeout.ReadTotalTimeoutMultiplier = 150; read_timeout.ReadTotalTimeoutConstant = 150; read_timeout.WriteTotalTimeoutMultiplier = 0; read_timeout.WriteTotalTimeoutConstant = 150; I asked the WriteFile command to send 8 bytes, and the size of my TxBuff[] is 250 bytes. Any Idea ? "using Overlapped I/O with the port" What does it do? do you have an example? is it complicate? Thanks! Quote: How much data are you actually sending? What kind of device is on the other end of the port? What kind of timeouts are you using? Have you considered using Overlapped I/O with the port yet? Gambit Back to top Guest Posted: Sun Jul 23, 2006 4:26 pm    Post subject: Re: Strange 'WriteFile' Freezing problem Sorry the timeouts are - read_timeout.ReadIntervalTimeout = 0; read_timeout.ReadTotalTimeoutMultiplier = 0; read_timeout.ReadTotalTimeoutConstant = 150; read_timeout.WriteTotalTimeoutMultiplier = 0; read_timeout.WriteTotalTimeoutConstant = 150; Back to top Remy Lebeau (TeamB) Guest Posted: Mon Jul 24, 2006 12:00 am    Post subject: Re: Strange 'WriteFile' Freezing problem "Ramy" <Ramy (AT) NoMail (DOT) com> wrote in message news:44c35c6a$1 (AT) newsgroups (DOT) borland.com... Quote: Hi, the timeouts that I use are the following - These are the timeouts that I use: read_timeout.ReadIntervalTimeout = 0; read_timeout.ReadTotalTimeoutMultiplier = 5; read_timeout.ReadTotalTimeoutConstant = 5000; read_timeout.WriteTotalTimeoutMultiplier = 5; read_timeout.WriteTotalTimeoutConstant = 1000; Quote: I asked the WriteFile command to send 8 bytes, and the size of my TxBuff[] is 250 bytes. What buffer sizes are you specifying in SetupComm()? What DBC values are you specifying in SetCommState()? Quote: Any Idea ? You did not answer my earlier question: "What kind of device is on the other end of the port? If the device is having problems reading, and you are using any kind of flow control, that might explain why your writing is freezing periodically. Quote: "using Overlapped I/O with the port" What does it do? do you have an example? is it complicate? Overlapped Operations http://msdn.microsoft.com/library/en-us/devio/base/overlapped_operations.asp Gambit 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.