BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Scrolling richedit using WM_VSCROLL          BorlandTalk.com Forum Index -> C++ Builder (VCL Components Usage) View previous topic :: View next topic   Author Message Rory Walsh Guest Posted: Tue Apr 11, 2006 1:03 pm    Post subject: Scrolling richedit using WM_VSCROLL I know this topic has been covered a million time but I have a problem that I haven't been able to find a solution to so I hope you might be able to help me. I am using the following code to cause my RichEdit to scroll downwards as text is added to it: RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); The problem is that on some machines it causes a crash reporting an error in RichEdit20.dll? If I take out this one line everything works fine. Does anyone know of an other albeit less efficient way to do the same thing? There is not much text being added so I can't imagine that it will slow down things too much. Of course it works fine on my machine but I recently tried it on two machines, one with WIndows XP Home and another with a version of XP Pro and it crashed on both. I think it may have more to do with software installed rather than the OS. Any help is much appreciated. Cheers, Rory. Back to top George Guest Posted: Tue Apr 11, 2006 5:03 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL How are you adding the text? For me RepRE->Lines->Append(line); usually adds the line of text and scrolls down Ok always showing the new, bottom line. This is with Widows XP Professional. But I have a new case when it does not scroll down, but still shows the top of the RE. Maybe I need to set focus. Maybe I will test your code. George Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: Quote: I am using the following code to cause my RichEdit to scroll downwards as text is added to it: RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); The problem is that on some machines it causes a crash reporting an error in RichEdit20.dll? Back to top Rory Walsh Guest Posted: Tue Apr 11, 2006 6:04 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL And your code works for me! Cheers, Rory. George wrote: Quote: Ok Rory, your code works on my system and it fixes my problem. Thanks, George. "George" <zombacity (AT) aol (DOT) com> wrote: How are you adding the text? For me RepRE->Lines->Append(line); usually adds the line of text and scrolls down Ok always showing the new, bottom line. This is with Widows XP Professional. But I have a new case when it does not scroll down, but still shows the top of the RE. Maybe I need to set focus. Maybe I will test your code. George Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: I am using the following code to cause my RichEdit to scroll downwards as text is added to it: RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); The problem is that on some machines it causes a crash reporting an error in RichEdit20.dll? Back to top Rory Walsh Guest Posted: Tue Apr 11, 2006 6:04 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL You can also do this Richedit1->SelStart = Richedit1->Text.Length(); if you have HideSelection set to false. Rory. George wrote: Quote: Ok Rory, your code works on my system and it fixes my problem. Thanks, George. "George" <zombacity (AT) aol (DOT) com> wrote: How are you adding the text? For me RepRE->Lines->Append(line); usually adds the line of text and scrolls down Ok always showing the new, bottom line. This is with Widows XP Professional. But I have a new case when it does not scroll down, but still shows the top of the RE. Maybe I need to set focus. Maybe I will test your code. George Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: I am using the following code to cause my RichEdit to scroll downwards as text is added to it: RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); The problem is that on some machines it causes a crash reporting an error in RichEdit20.dll? Back to top George Guest Posted: Tue Apr 11, 2006 6:04 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL Ok Rory, your code works on my system and it fixes my problem. Thanks, George. "George" <zombacity (AT) aol (DOT) com> wrote: Quote: How are you adding the text? For me RepRE->Lines->Append(line); usually adds the line of text and scrolls down Ok always showing the new, bottom line. This is with Widows XP Professional. But I have a new case when it does not scroll down, but still shows the top of the RE. Maybe I need to set focus. Maybe I will test your code. George Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: I am using the following code to cause my RichEdit to scroll downwards as text is added to it: RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); The problem is that on some machines it causes a crash reporting an error in RichEdit20.dll? Back to top George Guest Posted: Tue Apr 11, 2006 7:03 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL Unimportant, but I wonder why the help text says // SB_BOTTOM Scrolls to the lower right. When in fact for me it goes to lower left. George. Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: Quote: You can also do this Richedit1->SelStart = Richedit1->Text.Length(); if you have HideSelection set to false. Rory. Back to top Rory Walsh Guest Posted: Tue Apr 11, 2006 8:03 pm    Post subject: Re: Scrolling richedit using WM_VSCROLL That's one for the experts! George wrote: Quote: Unimportant, but I wonder why the help text says // SB_BOTTOM Scrolls to the lower right. When in fact for me it goes to lower left. George. Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: You can also do this Richedit1->SelStart = Richedit1->Text.Length(); if you have HideSelection set to false. Rory. Back to top JD Guest Posted: Wed Apr 12, 2006 12:03 am    Post subject: Re: Scrolling richedit using WM_VSCROLL Rory Walsh <rorywalsh (AT) ear (DOT) ie> wrote: Quote: [...] RichEdit1->Perform(WM_VSCROLL, SB_BOTTOM, 0); I would suggest that you use EM_SCROLLCARET instead. Just position the cursor where you want it by setting SelStart and then scroll to it: Richedit1->SelLength = 0; Richedit1->SelStart = Richedit1->Text.Length(); RichEdit1->Perform( EM_SCROLLCARET, 0, 0 ); That will scroll to the very end of the data and be ready for more data that can be added by setting the SelText. ~ 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 (VCL Components Usage) 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.