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• dll runtime error(C/C++/GCC/MSVC)

  - by coanor

  After two days fighting, I make the dll(compiled in GCC/G++) link correctly in MSVC, but while debuging, I got the runtime error, is say that: Runtime Error! Program: my_exe.exe This application has required the Runtime to terminate it in an unusual way. Please contact the application's support team for more information. I have test something in that way: compiled a dll in mingw/gcc, link and debug in MSVC, it works correctly ,but while I implement it in my large project, I got the runtime error. And I tested the dll in mingw/GCC, it works correctly, it says that the runtime error does not come from programming error,it comes from the dll imcompatible between different platform. Does anyone can hele me? Thanks, forgive my poor English.

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• Offline Database Write Cache in C#

  - by Todd Gardner

  I have a windows service that receives a large amount of data that needs to be transformed and persisted to a database. To ensure that we do not lose data, I want to create a "Write cache" for the data that will continue regardless if the database is online. Once the database becomes available again, I would want it to flush the content of the cache back into the database. I've seen some articles indicating that I might be able to do this with NHibernate, but I haven't found it conclusively. What options exist for this, and is NHibernate the appropriate direction?

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• On a Hudson master node, what are the .tmp files created in the workspace-files folder?

  - by Patrick Johnmeyer

  Question: In the path HUDSON_HOME/jobs/<jobname>/builds/<timestamp>/workspace-files, there are a series of .tmp files. What are these files, and what feature of Hudson do they support? Background Using Hudson version 1.341, we have a continuous build task that runs on a slave instance. After the build is otherwise complete, including archiving the artifacts, task scanner, etc., the job appears to hang for a long period of time. In monitoring the master node, I noted that many .tmp files were being created and modified under builds//workspace=files, and that some of them were very large. This appears to be causing the delay, as the job completed at the same time that files in this path stopped changing. Some key configuration points of the job: It is tied to a specific slave node It builds in a 'custom workspace' It triggers a downstream job that builds in the same custom workspace on the same slave node

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• Creating many native GUI frontends for a cross-platform application

  - by Hugh Young

  I've been away from GUI programming for quite some time so please pardon my ignorance. I would like to attempt the following: Write a Mac OSX app but still be able to port to Win/Linux (i.e. C++ core with Obj-C GUI) Avoid Qt/other toolkits on OSX (i.e. talk to Cocoa directly - I feel that many Qt apps I use stick out like sore thumbs compared to the rest of my system) Not as important, but it would be nice to avoid Visual Studio if it means I can have the freedom to use newer C++ features even on Windows if they help create better code. I believe this configuration might get me what I'm looking for: Core C++ Static Library OSX GUI (Cocoa) Windows GUI (Qt+MinGW?) OR (no new C++ features, Visual Studio + ManagedC++/C#/????) Linux GUI (Qt) Once again, sorry for my ignorance but is this possible? Is this sane? Are there any real-world open source examples accomplish something like this?

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• How to calculate textarea cols with 100% width?

  - by sehwoo

  I set the width of a textarea to 100%, but now I need to know how many characters can fit in one row. I'm trying to write a javascript function to auto-grow/shrink a textarea. I'm trying to keep from using jquery since I just need this one function. My logic is to rows = textarea.value.split('\n'), iterate through rows and count += rows[i].length/textarea.cols, then count += rows.length, and finally textarea.rows = count. The only problem is that count is too large because textarea.cols is too small.

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• C read part of file into cache

  - by Pete Jodo

  I have to do a program (for Linux) where there's an extremely large index file and I have to search and interpret the data from the file. Now the catch is, I'm only allowed to have x-bytes of the file cached at any time (determined by argument) so I have to remove certain data from the cache if it's not what I'm looking for. If my understanding is correct, fopen (r) doesn't put anything in the cache, only when I call getc or fread(specifying size) does it get cached. So my question is, lets say I use fread and read 100 bytes but after checking it, only 20 of the 100 bytes contains the data I need; how would I remove the useless 80 bytes from cache (or overwrite it) in order to read more from the file.

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• JSF Pages call ManagedBeans that are not defined on the page and call all getters sometimes more tha

  - by Bill Leeper

  I have several JSF pages that are initializing and accessing ManagedBeans that are not even used on that page. This is creating a really hairy problem for initialization. I either have to make them all session scope and continually make calls to re-inialize or take the performance hit of having them read large amounts of data from the DB whenever they decide to initialize. Some of the managed beans being accessed are not even defined on the page in question. I have done some optimization based on comments related to multiple calls to getters, but I still have the issue that I have a very specialized (and expensive to initialize) bean that is getting called when I don't want it initialized. Any insight into why/what JSF calls might do something like this. I have a very complex page making use of JSTL, Tomahawk and standard JSF tags. I could include code, but its very complex and sensitive in nature.

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• scaleX scaleY increasing left, top margin, and line spacing

  - by Mark

  If you have Text with a font that is 72 point for example (and scaleX scaleY = 1) you can achieve the same size with a font size of 12 and scaleX,scaleY = 6. For reasons that would take too long to explain I am applying a large scale factor as in the latter example. The problem is, even though the text is the same size, the line spacing and left and top margins have all been increased but I want them to be the same size as well. As far as the line spacing, I discovered that TextFormat.leading was being automatically increased when scaleX, scaleY was greater than 1, so I just had to reset TextFormat.leading back to 0. That leaves the left and top margins, and I have no idea how those are being increased. I tried TextFormat.blockIndent=0 and TextFormat.leftMargin=0 (and also ignorePadding=true) and it had no effect. And have no clue how to reset the top margin either to its orginal size, in case anyone has an idea for all these.

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• How to make a resolution independent camera preview on android?

  - by histeria

  Hi all, I'm making an android 1.6 app that uses phone's camera. In order to do this app resolution independent, I need to set a compatible aspect ratio for previewing camera on a SurfaceLayout. In 1.6 sdk there is no way to get supported sizes for the camera preview. It is possible to use a 4:3 or 3:2 aspect ratio and get no errors whith that? On the other hand, I need a way to make a xml layout that represents this Surfacelayout in this (unknown) aspect ratio in every resolution. I assume that is not possible to change the SurfaceLayout size in runtime. Can I do it with "dp" units? The other way is making this layout programmatically? There are some apps like Vignette or android camera application with some tricks to make something like that, like black bars (vignette) or fixed buttons bar, but I don't know how to do it in any kind of resolution. Any ideas? Thanks!

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• Oracle SQL: Multiple Subqueries Unioned Without Running Original Query Multiple Times.

  - by Bob

  So I've got a very large database, and need to work on a subset ~1% of the data to dump into an excel spreadsheet to make a graph. Ideally, I could select out the subset of data and then run multiple select queries on that, which are then UNION'ed together. Is this even possible? I can't seem to find anyone else trying to do this and would improve the performance of my current query quite a bit. Right now I have something like this: SELECT ( SELECT ( SELECT( long list of requirements ) UNION SELECT( slightly different long list of requirements ) ) ) and it would be nice if i could group the commonalities of the two long requirements and have simple differences between the two select statements being unioned.

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• SQLite: 2 Problems by working with table

  - by TianDong

  Hallo all, I have a SQliteDatabase object db, i want to create a table in db with the following code db.execSQL("CREATE TABLE IF NOT EXISTS "+ TABLE2_NAME + " (exer_nr INTEGER PRIMARY KEY ,exerText varchar(250),answerA varchar(250),answerB varchar(250),answerC varchar(250),answerD varchar(250))"); An Error occur. Why? Is this too large? How can i fix it? Another problem: I want to insert a row into the table, whose "exerText" column contains the following code as part of it's content. main( ) { int m=12, n=34; printf("%d%d", m+ +,+ +n); printf("%d%d\n",n+ +,+ +m); } An Error occur because of the "" and '' symbols in the code. How can i fix this problem ? Thanks a lot

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• Editable CATextLayer?

  - by Ron

  I have several CATextLayers. When I doubleclick one of them, I want to be able to edit it's string. Think of text as it's handled in Keynote or many other apps. Any ideas? I thought of putting an editable textfield right in front of the layer and then dismiss it on enter, but I didn't get far. :-( I target Mac OS X 10.5 with Objective-C 2.0 and Garbage Collection. Any help or pointers would be greatly appreciated. Thanks in advance!!

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• How do I effectively write to 146 output files in C++ using cstdlib library

  - by Elpezmuerto

  I have a very large binary file and I need to create separate files based on the id within the input file. There are 146 output files and I am using cstdlib and fopen and fwrite. FOPEN_MAX is 20, so I can't keep all 146 output files open at the same time. I also want to minimize the number of times I open and close an output file. How can I write to the output files effectively? I also must use the cstdlib library due to legacy code.

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• problem reading a csv file in python

  - by Hossein

  Hi, I am trying to read a very simple but somehow large(800Mb) csv file using the csv library in python. The delimiter is a single tab and each line consists of some numbers. Each line is a record, and I have 20681 rows in my file. I had some problems during my calculations using this file,it always stops at a certain row. I got suspicious about the number of rows in the file.I used the code below to count the number of row in this file: tfdf_Reader = csv.reader(open('v2-host_tfdf_en.txt'),delimiter=' ') c = 0 for row in tfdf_Reader: c = c + 1 print c To my surprise c is printed with the value of 61722!!! Why is this happening? What am I doing wrong?

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• Resources for Win32 C/C++ programming

  - by EricM

  I have experience in a variety of languages (Java, Perl, C#, PHP, javascript, ansi-C for microprocessors, Objective-C and others), with Win32 programming not being an area I've done a lot of work in. Now part of my job entails maintaining a large Win32 codebase that stretches back 15 years and includes everything from C written originally for Win95 to MFC to COM to 64-bit code for Win7 to C++ using Boost and so on. If there's a variation on how to do something it's in there. Are there any good Win32 C/C++ references that discuss both the proper way to do things today and give you a little sense of how things evolved? Something like this discussion of all the various boolean types, or how to approach the API monstrosity of simply copying a string. I don't see my career heading too far down this path, but I do like to understand what I'm working with and I think this is an important part of programming history. thanks, Eric

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• Invisible JFrame/JTable how much faster ?

  - by chacko

  I have a swing app. with a jframe with lots of internal frames containing large JTable. Those jtables get updated continuously so there is lots of repainting going on. in some circumstances I can simply keep the JFrame invisible. (frame.setVisible(false)) I was wondering if anybody knows if I will gain something in terms of performance (something considerable or not) such as 50% gain or you would only get 2% gain... and maybe some sort of explaination on what to expect. thanks

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• Unresolved External Symbol

  - by TomO

  I am working on wrapping a large number of .h and .lib files from native C++ to Managed C++ for eventual use as a referenced .dll in C#. I have the .lib files linked in and everything has been going smoothly so far. Upon wrapping the latest .h file, I hit a snag when 2 functions came back with the link error: error LNK2019: unresolved external symbol __imp__htonl@4 referenced in function "public: void __thiscall Field::setCharacter(unsigned char,int)" (?setCharacter@Field@@QAEXEH@Z) myutils.lib I have referenced "myutils.lib" in the linker options, so that shouldn't be the issue. What's strange is that I have about 20 functions in this particular .h file and all of the rest are linking just fine except for 3 functions. Any ideas?

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• How big can a SQL Server row be before it's a problem?

  - by John Leidegren

  Occasionally I run into this limitation using SQL Server 2000 that a row size can not exceed 8K bytes. SQL Server 2000 isn't really state of the art, but it's still in production code and because some tables are denormalized that's a problem. However, this seems to be a non issue with SQL Server 2005. At least, it won't complain that row sizes are bigger than 8K, but what happens instead and why was this a problem in SQL Server 2000? Do I need to care about my rows growing? Should I try and avoid large rows? Are varchar(max) and varbinary(max) a solution or expensive, in terms of size in database and/or CPU time? Why do I care at all about specifying the length of a particular column, when it seems like it's just a matter of time before someones going to hit that upper limit?

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• Application freezes when performing help file search

  - by ralphos

  I have a large C# application and a help file in *.chm format. When I press F1 to display this help file and select "Search" tab, type something and click "List Topics" button, both the help window and the entire application freeze. What's interesting when I simply open the *.chm file in the Windows Explorer, the search functionality works brilliantly. In order to display the help file from my application, I am executing: Help.ShowHelp(this, helpFileName); This method is executed from within the main form of the application on the UI thread.

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• NOT LIKE not working on comparison to a column

  - by rodling

  Data is fairly large and takes few minutes to run it every time, so its taking a lot of time debugging this problem. When I run like concat('%',T.item,'%') on smaller data it seems to identify items properly. However, when I run it on the main DB (the code shown), it still shows many(maybe even all) of the exceptions. EDIT: it seems when i add NOT it stops identifying items select distinct T.comment from (select comment, source, item from data, non_informative where ticker != "O" and source != 7 and source != 6) as T where T.comment not like concat('%',T.item,'%') order by T.comment; comment and source are in data, item is in non_informative Some items from T.item: 'Stock Analysis -', '#InsideTrades', 'IIROC Trade' Example comment which should be removed '#InsideTrades #4 | MACNAB CRAIG (Director,Officer,Chief Executive Officer): Filed Form 4 for $NNN (NATIONAL RETA' Can't seem to figure out it why shows all the items

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• scikit learn extratreeclassifier hanging

  - by denson

  I'm running the scikit learn on some rather large training datasets ~1,600,000,000 rows with ~500 features. The platform is Ubuntu server 14.04, the hardware has 100gb of ram and 20 CPU cores. The test datasets are about half as many rows. I set n_jobs = 10, and am forest_size = 3*number_of_features so about 1700 trees. If I reduce the number of features to about 350 it works fine but never completes the training phase with the full feature set of 500+. The process is still executing and using up about 20gb of ram but is using 0% of CPU. I have also successfully completed on datasets with ~400,000 rows but twice as many features which completes after only about 1 hour. I am being careful to delete any arrays/objects that are not in use. Does anyone have any ideas I might try?

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• How should I deal with sqlite errors?

  - by Dustin

  I have a long running application written in a mix of C and C++ that stores data in sqlite. While I am confident that committed data will remain available (barring mechanical failure) and uncommitted data will not be, it's not clear to me what I can do with this sort of middle state. I do a large number of inserts in a transaction and then commit it. When an error occurs on a given statement, I can schedule it to be attempted at some point in the future. It sounds like some errors might implicitly rollback my transaction (which would be undesirable if true). A larger problem is what happens when my commit itself fails. Currently, I'm just going to continue to retry it until it works. I would expect that whatever would cause my commit to fail may very well also cause a rollback to fail. What is the recommended mechanism for error handling in such a situation?

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• Including full LaTeX documents within others.

  - by Chris Clarke

  I'm currently finishing off my dissertation, and would like to be able to include some documents within my LaTeX document. The files I'd like to include are weekly reports done in LaTeX to my supervisor. Obviously all documents are page numbered seperately. I would like them to be included in the final document. I could concatenate all the final PDFs using GhostScript or some other tool, but I would like to have consistent numbering throughout the document. I have tried including the LaTeX from each document in the main document, but the preamble etc causes problems and the small title I have in each report takes a whole page... In summary, I'm looking for a way of including a number of 1 or 2 page self-complete LaTeX files in a large report, keeping their original layouts, but changing the page numbering.

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• How would you use version control for personal data, like a personal website?

  - by nn

  This is more a use-case question, but I generate static files for a personal website using txt2tags. I was thinking of maybe storing this information in a git repository. Normally I use RCS since it's simplest, and I'm only a single user. But there just seems to be a large trend of people using git/svn/cvs/etc. for personal data, and I thought this may also be a good way to at least learn some of the basics of the tool. Obviously most of the learning is done in an environment where you collaborate. So back to the question: how would you use use a version control system such as git, to manage a personal website?

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• Access variable value using string representing variable's name

  - by Paul Ridgway

  Hello everyone, If the title was not clear, I will try to clarify what I am asking: Imagine I have a variable called counter, I know I can see its current value by doing something like: std::cout << counter << std::endl; However, assume I have lots of variables and I don't know which I'm going to want to look at until runtime. Does anyone know a way I can fetch the value of a variable by using its name, for example: std::cout << valueOf("counter") << std::endl; I feel being able to do this might make debugging large complex projects easier. Thanks in advance for your time.

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