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  • What is the proper way of hard-coding sections in a UITableView?

    - by Sheehan Alam
    I have a UITableView with 3 sections that are hard coded. Everything is working fine, but I am not sure if I am doing it correctly. Define number of rows in section: - (NSInteger)tableView:(UITableView *)tblView numberOfRowsInSection:(NSInteger)section { NSInteger rows; //Bio Section if(section == 0){ rows = 2; } //Profile section else if(section == 1){ rows = 5; } //Count section else if(section == 2){ rows = 3; } } return rows; } Here is where I build my cells: - (UITableViewCell *)tableView:(UITableView *)tblView cellForRowAtIndexPath:(NSIndexPath *)indexPath { static NSString *CellIdentifier = @"Cell"; UITableViewCell *cell = [tblView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier] autorelease]; } cell.textLabel.numberOfLines = 5; cell.textLabel.font = [UIFont fontWithName:@"Helvetica" size:(10.0)]; cell.textLabel.lineBreakMode = UILineBreakModeWordWrap; if ([self.message_source isEqualToString:@"default"]) { if (indexPath.section == 0) { if (indexPath.row == 0) { cell.textLabel.text = [Utils formatMessage:[NSString stringWithFormat: @"%@", mySTUser.bio]]; cell.detailTextLabel.text = nil; } else if(indexPath.row == 1){ cell.textLabel.text = [NSString stringWithFormat: @"%@", mySTUser.website]; cell.detailTextLabel.text = nil; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } } } //more code exists, but you get the point... Now I define my number of sections - (NSInteger)numberOfSectionsInTableView:(UITableView *)tblView { return 3; } Is this the proper way of hard-coding my UITableView? Will I run into any issues when cells are reused?

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  • Clarification On Write-Caching Policy, Its Underlying Options And How It Applies To Hard Drives And Solid-State Drives

    - by Boris_yo
    In last week after doing more research on subject matter, I have been wondering about what I have been neglecting all those years to understand write-caching policy, always leaving it on default setting. Write-caching policy improves writing performance and consists of write-back caching and write-cache buffer flushing. This is how I understand all the above, but correct me if I erred somewhere: Write-through cache / Write-through caching itself is not a part of write caching policy per se and it's when data is written to both cache and storage device so if Windows will need that data later again, it is retrieved from cache and not from storage device which means only improved read performance as there is no need for waiting for storage device to read required data again. Since data is still written to storage device, write performance isn't improved and represents no risk of data loss or corruption in case of power failure or system crash while only data in cache gets lost. This option seems to be enabled by default and is recommended for removable devices with no need to use function of "Safely Remove Hardware" on user's part. Write-back caching is similar to above but without writing data to storage device, periodically releasing data from cache and writing to storage device when it is idle. In my opinion this option improves both read and write performance but represents risk if power failure or system crash occurs with the outcome of not only losing data eventually to be written to storage device, but causing file inconsistencies or corrupted file system. Write-back caching cannot be enabled together with write-through caching and it is not recommended to be enabled if no backup power supply is availabe. Write-cache buffer flushing I reckon is similar to write-back caching but enables immediate release and writing of data from cache to storage device right before power outage occurs but I don't know if it applies also to occasional system crash. This option seem to be complementary to write-back cache reducing or potentially eliminating risk of data loss or corruption of file system. I have questions about relevance of last 2 options to today's modern SSDs in order to get best performance and with less wear on SSDs: I know that traditional hard drives come with onboard cache (I wonder what type of cache that is), but do SSDs also come with cache? Assuming they do, is this cache faster than their NAND flash and system RAM and worth taking the risk of utilizing it by enabling write-back cache? I read somewhere that generally storage device's cache is faster than RAM, but I want to be sure. Additionally I read that write-caching should be enabled since current data that is to be written later to NAND flash is kept for a while in cache and provided there is data that gets modified a lot before finally being written, holding of this data and its periodic release reduces its write times to SSD thereby reducing its wearing. Now regarding to write-cache buffer flushing, I heard that SSD controllers are so fast by themselves that enabling this option is not required, because they manage flushing. However, once again, I don't know if SSDs have their own onboard cache and whether or not it is faster than their NAND flash and system RAM because if it is, keeping this option enabled would make sense. Recently I have posted question about issue with my Intel 330 SSD 120GB which was main reason to do deeper research having suspicion of write-caching policy being the culprit of SSD's freezing issue assuming data being released is what causes freezes. Currently I have write-cache enabled and write-cache buffer flushing disabled because I believe SSD controller's management of write-cache flushing and Windows write-cache buffer flushing are conflicting with each other: Since I want to troubleshoot in small steps to finally determine the source of issue, I have decided to start with write-caching policy and the move to drivers, switching to AHCI later on and finally disabling DIPM (device initiated power management) through registry modification thanks to @TomWijsman

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  • Any limitations for putting an SSD in a Mini? How fast would an external HDD be via Firewire? Is Ser

    - by Cyrcle
    I'm considering getting a Mini for web programming. I do a lot of text searches so I want to put a SSD in it. Does the Mini have any limitations that might effect the performance of a SSD? I'm trying to decide if I should get a Mini Server. I'd like to be able to have two internal drives so one can be SSD for OS and the code I'm working on, and the other can be my storage drive. However, I'm not sure if I'll be using the extra functionality of the server edition OSX or not, so I'm reluctant to pay the $200 premium. In a "regular" Mini I could put the SSD internal and use an external big drive, but would the external drive be fast enough via Firewire? Thanks in advance for any info.

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  • Error compiling / linking e text editor on Linux

    - by jckdnk111
    The code compiles without too much complaint, but the last step fails with the error below. There is some discussion about it on the e forum, but still no answer. [LD] e ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x0): multiple definition of `_pcre_OP_lengths' .objs.release/cx_pcre_tables.o:(.rodata+0x0): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x70): multiple definition of `_pcre_utf8_table1' .objs.release/cx_pcre_tables.o:(.rodata+0x70): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x88): multiple definition of `_pcre_utf8_table1_size' .objs.release/cx_pcre_tables.o:(.rodata+0x88): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x8c): multiple definition of `_pcre_utf8_table2' .objs.release/cx_pcre_tables.o:(.rodata+0x8c): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0xa4): multiple definition of `_pcre_utf8_table3' .objs.release/cx_pcre_tables.o:(.rodata+0xa4): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0xc0): multiple definition of `_pcre_utf8_table4' .objs.release/cx_pcre_tables.o:(.rodata+0xc0): first defined here ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x180): multiple definition of `_pcre_utt_names' .objs.release/cx_pcre_tables.o:(.rodata+0x100): first defined here /usr/bin/ld: Warning: size of symbol `_pcre_utt_names' changed from 657 in .objs.release/cx_pcre_tables.o to 740 in ../external/out.release/lib/libpcre.a(pcre_tables.o) ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x480): multiple definition of `_pcre_utt' .objs.release/cx_pcre_tables.o:(.rodata+0x3a0): first defined here /usr/bin/ld: Warning: size of symbol `_pcre_utt' changed from 630 in .objs.release/cx_pcre_tables.o to 696 in ../external/out.release/lib/libpcre.a(pcre_tables.o) ../external/out.release/lib/libpcre.a(pcre_tables.o):(.rodata+0x738): multiple definition of `_pcre_utt_size' .objs.release/cx_pcre_tables.o:(.rodata+0x618): first defined here .objs.release/cx_pcre_exec.o: In function `match(doc_byte_iter, unsigned char const*, doc_byte_iter, int, match_data*, unsigned long, eptrblock*, int, unsigned int)': cx_pcre_exec.cpp:(.text+0x1c2a): undefined reference to `_pcre_ord2utf8(int, unsigned char*)' .objs.release/eauibook.o: In function `eAuiNotebook::LoadPerspective(wxString const&)': eauibook.cpp:(.text+0x9ad): undefined reference to `wxTabFrame::SetTabCtrlHeight(int)' .objs.release/PreviewDlg.o: In function `global constructors keyed to _ZN10PreviewDlg13sm_eventTableE': PreviewDlg.cpp:(.text+0x11b2): undefined reference to `wxEVT_WEB_TITLECHANGE' PreviewDlg.cpp:(.text+0x11ee): undefined reference to `wxEVT_WEB_DOMCONTENTLOADED' .objs.release/PreviewDlg.o: In function `PreviewDlg::RefreshBrowser(PreviewDlg::cxUpdateMode)': PreviewDlg.cpp:(.text+0x2a47): undefined reference to `wxWebControl::OpenURI(wxString const&, unsigned int, wxWebPostData*, bool)' .objs.release/PreviewDlg.o: In function `PreviewDlg::OnWebDocumentComplete(wxWebEvent&)': PreviewDlg.cpp:(.text+0x3259): undefined reference to `wxWebControl::GetCurrentURI() const' .objs.release/PreviewDlg.o: In function `PreviewDlg::PreviewDlg(EditorFrame&)': PreviewDlg.cpp:(.text+0x4984): undefined reference to `wxWebControl::IsInitialized()' PreviewDlg.cpp:(.text+0x49c5): undefined reference to `wxWebControl::wxWebControl(wxWindow*, int, wxPoint const&, wxSize const&)' PreviewDlg.cpp:(.text+0x562f): undefined reference to `wxWebControl::InitEngine(wxString const&)' .objs.release/PreviewDlg.o: In function `PreviewDlg::PreviewDlg(EditorFrame&)': PreviewDlg.cpp:(.text+0x68e4): undefined reference to `wxWebControl::IsInitialized()' PreviewDlg.cpp:(.text+0x6925): undefined reference to `wxWebControl::wxWebControl(wxWindow*, int, wxPoint const&, wxSize const&)' PreviewDlg.cpp:(.text+0x758f): undefined reference to `wxWebControl::InitEngine(wxString const&)' .objs.release/PreviewDlg.o: In function `PreviewDlg::OnButtonForward(wxCommandEvent&)': PreviewDlg.cpp:(.text+0x132): undefined reference to `wxWebControl::GoForward()' .objs.release/PreviewDlg.o: In function `PreviewDlg::OnButtonBack(wxCommandEvent&)': PreviewDlg.cpp:(.text+0x182): undefined reference to `wxWebControl::GoBack()' ../ecore/libecore.so(cxInternal.o): In function `cxInternal::MoveOldSettings(eSettings&)': cxInternal.cpp:(.text+0x4d29): undefined reference to `eSettings::SetPageSettings(unsigned int, wxString const&, doc_id, int, int, wxString const&, std::vector<unsigned int, std::allocator<unsigned int> > const&, std::vector<cxBookmark, std::allocator<cxBookmark> > const&, eSettings::SubPage)' collect2: ld returned 1 exit status make: *** [e] Error 1 EDIT: Forgot the link http://github.com/etexteditor/e

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  • Difficulties getting GraphViz working as a library in C++

    - by DistortedLojik
    Am working on a program that will allow a graph of nodes to be displayed and then updated visually as the nodes themselves are updated. I am fairly new to Visual Studio 2010 and am following the GraphViz guide located at http://www.graphviz.org/pdf/libguide.pdf in order to get GraphViz working as a library. I have the following code which is taken straight from the pdf linked above. #include <graphviz\gvc.h> #include <graphviz\cdt.h> #include <graphviz\graph.h> #include <graphviz\pathplan.h> using namespace std; int main(int argc, char **argv) { Agraph_t *g; Agnode_t *n, *m; Agedge_t *e; Agsym_t *a; GVC_t *gvc; /* set up a graphviz context */ gvc = gvContext(); /* parse command line args - minimally argv[0] sets layout engine */ gvParseArgs(gvc, argc, argv); /* Create a simple digraph */ g = agopen("g", AGDIGRAPH); n = agnode(g, "n"); m = agnode(g, "m"); e = agedge(g, n, m); /* Set an attribute - in this case one that affects the visible rendering */ agsafeset(n, "color", "red", ""); /* Compute a layout using layout engine from command line args */ gvLayoutJobs(gvc, g); /* Write the graph according to -T and -o options */ gvRenderJobs(gvc, g); /* Free layout data */ gvFreeLayout(gvc, g); /* Free graph structures */ agclose(g); /* close output file, free context, and return number of errors */ return (gvFreeContext(gvc)); } After compiling I get the following errors which indicate that I do not have it correctly linked. 1>main.obj : error LNK2019: unresolved external symbol _gvFreeContext referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _agclose referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _gvFreeLayout referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _gvRenderJobs referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _gvLayoutJobs referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _agsafeset referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _agedge referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _agnode referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _agopen referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _gvParseArgs referenced in function _main 1>main.obj : error LNK2019: unresolved external symbol _gvContext referenced in function _main Within the VC++ Directories I have C:\Program Files (x86)\Graphviz2.26.3\include in the Include Directories and C:\Program Files (x86)\Graphviz2.26.3\lib\release\lib in the Library Directories Any help would be greatly appreciated to help get this working. Thank you.

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  • C# app fails to load Matlab DLL when running from a shared drive?

    - by jg
    I have a C# .NET 2.0 program that calls a Matlab .dll file that I created using Matlab Builder for .NET. This Matlab .dll file is a wrapper for a m file function that I need to call from my C# program. Everything works fine when I run this app from my local drive. However once I copy the app to a shared drive the Matlab dll fails when it's first loaded. I setup caspol to allow .NET programs to run from shared drives. Does anyone know what could cause this problem or a tool that I could use to easily figure out what the problem is? Thanks.

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  • Why do C compilers prepend underscores to external names?

    - by Michael Burr
    I've been working in C for so long that the fact that compilers typically add an underscore to the start of an extern is just understood... However, another SO question today got me wondering about the real reason why the underscore is added. A wikipedia article claims that a reason is: It was common practice for C compilers to prepend a leading underscore to all external scope program identifiers to avert clashes with contributions from runtime language support I think there's at least a kernel of truth to this, but also it seems to no really answer the question, since if the underscore is added to all externs it won't help much with preventing clashes. Does anyone have good information on the rationale for the leading underscore? Is the added underscore part of the reason that the Unix creat() system call doesn't end with an 'e'? I've heard that early linkers on some platforms had a limit of 6 characters for names. If that's the case, then prepending an underscore to external names would seem to be a downright crazy idea (now I only have 5 characters to play with...).

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  • How do you data drive task dependencies via properties in psake?

    - by Jordan
    In MSBuild you can data drive target dependencies by passing a item group into a target, like so: <ItemGroup> <FullBuildDependsOn Include="Package;CoreFinalize" Condition="@(FullBuildDependsOn) == ''" /> </ItemGroup> <Target Name="FullBuild" DependsOnTargets="@(FullBuildDependsOn)" /> If you don't override the FullBuildDependsOn item group, the FullBuild target defaults to depending on the Package and CoreFinalize targets. However, you can override this by defining your own FullBuildDependsOn item group. I'd like to do the same in psake - for example: properties { $FullBuildDependsOn = "Package", "CoreFinalize" } task default -depends FullBuild # this won't work because $FullBuildDependsOn hasn't been defined yet - the "Task" function will see this as a null depends array task FullBuild -depends $FullBuildDependsOn What do I need to do to data drive the task dependencies in psake?

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  • What benefits are there to storing Javascript in external files vs in the <head>?

    - by RenderIn
    I have an Ajax-enabled CRUD application. If I display a record from my database it shows that record's values for each column, including its primary key. For the Ajax actions tied to buttons on the page I am able to set up their calls by printing the ID directly into their onclick functions when rendering the HTML server-side. For example, to save changes to the record I may have a button as follows, with '123' being the primary key of the record. <button type="button" onclick="saveRecord('123')">Save</button> Sometimes I have pages with Javascript generating HTML and Javascript. In some of these cases the primary key is not naturally available at that place in the code. In these cases I took a shortcut and generate buttons like so, taking the primary key from a place it happens to be displayed on screen for visual consumption: ... <td>Primary Key: </td> <td><span id="PRIM_KEY">123</span></td> ... <button type="button" onclick="saveRecord(jQuery('#PRIM_KEY').text())">DoSomething</button> This definitely works, but it seems wrong to drive database queries based on the value of text whose purpose was user consumption rather than method consumption. I could solve this by adding a series of additional parameters to various methods to usher the primary key along until it is eventually needed, but that also seems clunky. The most natural way for me to solve this problem would be to simply situate all the Javascript which currently lives in external files, in the <head> of the page. In that way I could generate custom Javascript methods without having to pass around as many parameters. Other than readability, I'm struggling to see what benefit there is to storing Javascript externally. It seems like it makes the already weak marriage between HTML/DOM and Javascript all the more distant. I've seen some people suggest that I leave the Javascript external, but do set various "custom" variables on the page itself, for example, in PHP: <script type="text/javascript"> var primaryKey = <?php print $primaryKey; ?>; </script> <script type="text/javascript" src="my-external-js-file-depending-on-primaryKey-being-set.js"></script> How is this any better than just putting all the Javascript on the page in the first place? There HTML and Javascript are still strongly dependent on each other.

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  • Android ListView clears when hard BACK key is pressed.

    - by Rpond
    In my android app I have a Tabhost with a ListView as one of the tabs. By clicking on an item in the ListView (an address) I start an Intent to Google Maps for directions and the choice dialog pops up for google maps, web browser etc. Problem is if I press the hard back button then the launch dialog goes away but also the ListView is cleared. Any idea why?

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  • How to feed data over STDIN to multiple external commands in ruby.

    - by Erik
    This question is a bit like my previous (answered) question: How to run multiple external commands in the background in ruby. But, in this case I am looking for a way to feed ruby strings over STDIN to external processes, something like this (the code below is not valid but illustrates my goal): #!/usr/bin/ruby str1 = 'In reality a relatively large string.....' str2 = 'Another large string' str3 = 'etc..' spawn 'some_command.sh', :stdin => str1 spawn 'some_command.sh', :stdin => str2 spawn 'some_command.sh', :stdin => str3 Process.waitall

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  • ASP.NET Performance, 100 "Memory Hard Faults" indiciate a memory swapping problem?

    - by Robert
    With a customer web site we currently experiences performance problems. While analyzing the problem we found an unexpected amount of of 112 "Memory Hard Faults" per minute. Does anybody can interpret the meaning of this value? Does this happen, when memory swapping is necessary - so the root cause is not sufficient memory? Even if the CPU value seems high, it is not the main problem for the slow web site. Do you agree?

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  • How to read data from SharePoint list using View RSS feeds to external site?

    - by James123
    I want export data from SharePoint lists (discussion forums, documents library, calendar) information to external site using RSS. Right now our SharePoint sites built on FBA based, so all sites are behind login page. Now I export each updates from these lists to our another external public site (anonymous). I know we have default View RSS Feed option. But that is not working for all readers like Google Reader, etc. Is there any free developer (open source) tool supports in this? Please share some ideas.

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  • Is a Service Bus a good option to communicate with multiple external servers?

    - by PFreitas
    We are developing an application that communicates, via web services or TCP/IP sockets, with multiple servers (up to 50 different external companies). Basically, the exchanged messages are the same (XML), but depending on the inputs of our application we should call 1 or more external servers. The benefits we would expect of introducing a Service Bus in the architecture would be: 1- Remove the need to manage all point-to-point configurations (all the 50 endpoints); 2- Simplify the communication layer of our application by having only one server to talk to; Is a Service Bus a good architectural option for this scenario? What is the best (simplest) Service Bus for this kind of communication? I read a few MSDN articles on Azure Service Bus Relay, but it didn’t seem to fit our needs. Am I wrong? Thanks for your help.

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  • Why is good UI design so hard for some Developers?

    - by Chris Ballance
    Some of us just have a hard time with the softer aspects of UI design (myself especially). Are "back-end coders" doomed to only design business logic and data layers? Is there something we can do to retrain our brain to be more effective at designing pleasing and useful presentation layers? Colleagues have recommended a few books me including The Design of Sites, Don't make me think and Why Software sucks , but I am wondering what others have done to remove their deficiencies in this area?

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  • Dedicated hard disk for SE dbname.dbs files & dedicated ramdisk for /tmp files.

    - by Frank Computer
    INFORMIX-SE 7.2: I would like to dedicate a hard disk, exclusively for my dbname.dbs directory which holds all the .dat and .idx files, and create a ramdisk for my /tmp temporary files in order to improve performance. I would also like to strip down the OS from any unecessary files and processes to minimize overhead for my dedicated application. Is this a good idea and are there any roadmaps for accomplishing this?

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