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  • close file with fopen() but file still in use

    - by Marco
    Hi all, I've got a problem with deleting/overwriting a file using my program which is also being used(read) by my program. The problem seems to be that because of the fact my program is reading data from the file (output.txt) it puts the file in a 'in use' state which makes it impossible to delete or overwrite the file. I don't understand why the file stays 'in use' because I close the file after use with fclose(); this is my code: bool bBool = true while(bBool){ //Run myprogram.exe tot generate (a new) output.txt //Create file pointer and open file FILE* pInputFile = NULL; pInputFile = fopen("output.txt", "r"); // //then I do some reading using fscanf() // //And when I'm done reading I close the file using fclose() fclose(pInputFile); //The next step is deleting the output.txt if( remove( "output.txt" ) == -1 ){ //ERROR }else{ //Succesfull } } I use fclose() to close the file but the file remains in use by my program until my program is totally shut down. What is the solution to free the file so it can be deleted/overwrited? In reality my code isn't a loop without an end ; ) Thanks in advance! Marco

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  • Delphi and prevent event handling

    - by pKarelian
    How do you prevent a new event handling to start when an event handling is already running? I press a button1 and event handler start e.g. slow printing job. There are several controls in form buttons, edits, combos and I want that a new event allowed only after running handler is finnished. I have used fRunning variable to lock handler in shared event handler. Is there more clever way to handle this? procedure TFormFoo.Button_Click(Sender: TObject); begin if not fRunning then try fRunning := true; if (Sender = Button1) then // Call something slow ... if (Sender = Button2) then // Call something ... if (Sender = Button3) then // Call something ... finally fRunning := false; end; end;

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  • Very simple Error handling with NServiceBus

    - by andy
    hey guys, here's a simple scenario NServiceBus Client/Server setup. The "Message" is a custom Class I wrote. The Client sends a request message. The Server receives the message, and the server does this: Bus.Reply(new UserDataResponseMessage { ID = Guid.NewGuid(), Response = users }); Then nothing. The Client never receives a response. Exception: By trawling through the log4net NServiceBus logs I find an exception, and it turns out that my customs class "users" is not marked as Serializable. Ok, how does one got about "throwing" or "handling" that kind of error? NServiceBus seems to promote the idea of not handling errors, but in this scenario its obvious to see some kind of "throw" would have saved a lot of time. How do I handle such exceptions, where do they occur, where do they go?

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  • Windows 7 ssh file server.

    - by Siriss
    Hello all- I have looked at the other posts, but have not quite found an answer I have a question about windows file sharing over SSH. I have copssh installed and it is working for Remote desktop connections. I have port 22 forwarded on my router etc. I connect from a Mac or Putty with this address: ssh -l copsshusername 3391:localhost:3389 [external ip] That works fine. I would like to configure Windows 7 to allow my ssh account that I use to login, access to certain shared folders. I have documents and videos and things that I would like to be able to download externally. I have done this before on Linux and a long time ago on XP, but I cannot figure out what I am missing on Windows 7. There is a designated SSH user that copssh uses to run the service and that I use to to login as. I have googled and googled and have not found a solution that does everything I need that is why I am turning here for ideas. I hope I am explaining this correctly. Thank you very much for your help!

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  • Error handling and polymorphism

    - by Neeraj
    I have an application with some bunch of code like this: errCode = callMainSystem(); switch (errCode){ case FailErr: error("Err corresponding to val1\n"); case IgnoreErr: error("Err corresponding to val2\n"); ... ... default: error("Unknown error\n"); } The values are enum constants. Will it make some sense to have something like: // Error* callMainSystem() ... Some code return FaileErr(); // or some other error // handling code Error* err = callMainSystem(); err->toString(); The Error class may be made singleton as it only has to print error messages. What are the pros and cons of above methods,size is an important criteria as the application needs to be supported on embedded devices as well. P.S: I don't want to use exception handling because of portability issues and associated overheads.

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  • Android: writing a file to sdcard

    - by Sumit M Asok
    I'm trying to write a file from an Http post reply to a file on the sdcard. Everything works fine until the byte array of data is retrieved. I've tried setting WRITE_EXTERNAL_STORAGE permission in the manifest and tried many different combinations of tutorials I found on the net. All I could find was using the openFileOutput("",MODE_WORLD_READABLE) method, of the activity but how my app writes file is by using a thread. Specifically, a thread is invoked from another thread when a file has to be written, so giving an activity object didn't work even though I tried it. The app has come a long way and I cannot change how the app is currently written. Please, someone help me? CODE: File file = new File(bgdmanip.savLocation); FileOutputStream filecon = null; filecon = new FileOutputStream(file); // bgdmanip.savLocation holds the whole files path byte[] myByte; myByte = Base64Coder.decode(seReply); Log.d("myBytes", String.valueOf(myByte)); bos.write(myByte); filecon.write(myByte); myvals = x * 11024; seReply is a string reply from HttpPost response. the second set of code is looped with reference to x. the file is created but remains 0 bytes

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  • Best method in PHP for the Error Handling ? Convert all PHP errors (warnings notices etc) to exceptions?

    - by user1179459
    What is the best method in PHP for the Error Handling ? is there a way in PHP to Convert all PHP errors (warnings notices etc) to exceptions ? what the best way/practise to error handling ? again: if we overuse exceptions (i.e. try/catch) in many situations, i think application will be halted unnecessary. for a simple error checking we can use return false; but it may be cluttering the coding with many if else conditions. what do you guys suggest ?

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  • Defensive Error Handling

    TRY…CATCH error handling in SQL Server has certain limitations and inconsistencies that will trap the unwary developer, used to the more feature-rich error handling of client-side languages such as C# and Java. In this article, abstracted from his excellent new book, Defensive Database Programming with SQL Server, Alex Kuznetsov offers a simple, robust approach to checking and handling errors in SQL Server, with client-side error handling used to enforce what is done on the server.

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  • Handling multiple column data with Java

    - by Ender
    I am writing an application that reads in a large number of basic user details in the following format; once read in it then allows the user to search for a user's details using their email: NAME ROLE EMAIL --------------------------------------------------- Joe Bloggs Manager [email protected] John Smith Consultant [email protected] Alan Wright Tester [email protected] ... The problem I am suffering is that I need to store a large number of details of all people that have worked at the company. The file containing these details will be written on a yearly basis simply for reporting purposes, but the program will need to be able to access these details quickly. The way I aim to access these files is to have a program that asks the user for the name of the unique email of the member of staff and for the program to then return the name and the role from that line of the file. I've played around with text files, but am struggling with how I would handle multiple columns of data when it comes to searching this large file. What is the best format to store such data in? A text file? XML? The size doesn't bother me, but I'd like to be able to search it as quickly as possible. The file will need to contain a lot of entries, probably over the 10K mark over time.

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  • Handling two WebException's properly

    - by baron
    Hi Everyone, I am trying to handle two different WebException's properly. Basically they are handled after calling WebClient.DownloadFile(string address, string fileName) AFAIK, so far there are two I have to handle, both WebException's: The remote name could not be resolved (i.e. No network connectivity to access server to download file) (404) File not nound (i.e. the file doesn't exist on the server) There may be more but this is what I've found most important so far. So how should I handle this properly, as they are both WebException's but I want to handle each case above differently. This is what I have so far: try { using (var client = new WebClient()) { client.DownloadFile("..."); } } catch(InvalidOperationException ioEx) { if (ioEx is WebException) { if (ioEx.Message.Contains("404") { //handle 404 } if (ioEx.Message.Contains("remote name could not") { //handle file doesn't exist } } } As you can see I am checking the message to see what type of WebException it is. I would assume there is a better or a more precise way to do this? Thanks

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  • Multiple file descriptors to the same file, C

    - by Gigi
    I have a multithreaded application that is opening and reading the same file (not writing). I am opening a different file descriptor for each thread (but they all point to the same file). Each thread then reads the file and may close it and open it again if EOF is reached. Is this ok? If I perform fclose() on a file descriptor does it affect the other file descritptors that point to the same file?

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  • File system implementation in MongoDB with GridFS

    - by Ralph
    I am working on two projects that will both implement a Webdav server backed by a MongoDB GridFS. In each case, there is the potential for the system to store tens of millions of files spread across thousands of hierarchical directories. I can come up with two different ways of storing the directory structure: As a "true" hierarchical file system, with directories containing the IDs (_id) of subdirectories and regular files. The paths will be separated by slashes (/) as in a POSIX-compliant file system. The path /a/b/c will be represented as a directory a containing a directory b containing a file c. As a flat file system, where file names include the slashes. The path /a/b/c will be stored as a single file with the name /a/b/c What are the advantages and disadvantages of each, with respect to a "real" folder-based file system?

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  • How to install PHP-FPM and PHP on Ubuntu?

    - by Sanoj
    I have problems with installing PHP and in Ubuntu. I followed the instructions on the PHP-FPM site, PHP FastCGI Process Manager but when doing ../configure && make to compile PHP I got a lot of not found messages (listed below), and I don't know how to fix them. I tried both the Integrated compilation and Separate compilation but both compilations ends up with the same messages. Is there a solution or workaround? An alternativ way to install PHP with PHP-FPM? ../configure: 11986: ac_fn_c_check_func: not found ../configure: 11997: ac_fn_c_check_func: not found ../configure: 12147: 5: Bad file descriptor ../configure: 12147: :: checking for socket in -lsocket: not found ../configure: 12147: 6: Bad file descriptor ../configure: 12147: checking for socket in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12147: ac_fn_c_try_link: not found ../configure: 12147: 5: Bad file descriptor ../configure: 12147: :: result: no: not found ../configure: 12147: 6: Bad file descriptor ../configure: 12147: no: not found ../configure: 12147: 5: Bad file descriptor ../configure: 12147: :: checking for __socket in -lsocket: not found ../configure: 12147: 6: Bad file descriptor ../configure: 12147: checking for __socket in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12147: ac_fn_c_try_link: not found ../configure: 12147: 5: Bad file descriptor ../configure: 12147: :: result: no: not found ../configure: 12147: 6: Bad file descriptor ../configure: 12147: no: not found ../configure: 12154: ac_fn_c_check_func: not found ../configure: 12165: ac_fn_c_check_func: not found ../configure: 12315: 5: Bad file descriptor ../configure: 12315: :: checking for socketpair in -lsocket: not found ../configure: 12315: 6: Bad file descriptor ../configure: 12315: checking for socketpair in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12315: ac_fn_c_try_link: not found ../configure: 12315: 5: Bad file descriptor ../configure: 12315: :: result: no: not found ../configure: 12315: 6: Bad file descriptor ../configure: 12315: no: not found ../configure: 12315: 5: Bad file descriptor ../configure: 12315: :: checking for __socketpair in -lsocket: not found ../configure: 12315: 6: Bad file descriptor ../configure: 12315: checking for __socketpair in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12315: ac_fn_c_try_link: not found ../configure: 12315: 5: Bad file descriptor ../configure: 12315: :: result: no: not found ../configure: 12315: 6: Bad file descriptor ../configure: 12315: no: not found ../configure: 12322: ac_fn_c_check_func: not found ../configure: 12333: ac_fn_c_check_func: not found ../configure: 12483: 5: Bad file descriptor ../configure: 12483: :: checking for htonl in -lsocket: not found ../configure: 12483: 6: Bad file descriptor ../configure: 12483: checking for htonl in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12483: ac_fn_c_try_link: not found ../configure: 12483: 5: Bad file descriptor ../configure: 12483: :: result: no: not found ../configure: 12483: 6: Bad file descriptor ../configure: 12483: no: not found ../configure: 12483: 5: Bad file descriptor ../configure: 12483: :: checking for __htonl in -lsocket: not found ../configure: 12483: 6: Bad file descriptor ../configure: 12483: checking for __htonl in -lsocket... : not found cat: confdefs.h: No such file or directory ../configure: 12483: ac_fn_c_try_link: not found ../configure: 12483: 5: Bad file descriptor ../configure: 12483: :: result: no: not found ../configure: 12483: 6: Bad file descriptor ../configure: 12483: no: not found ../configure: 12490: ac_fn_c_check_func: not found ../configure: 12501: ac_fn_c_check_func: not found ../configure: 12651: 5: Bad file descriptor ../configure: 12651: :: checking for gethostname in -lnsl: not found ../configure: 12651: 6: Bad file descriptor ../configure: 12651: checking for gethostname in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12651: ac_fn_c_try_link: not found ../configure: 12651: 5: Bad file descriptor ../configure: 12651: :: result: no: not found ../configure: 12651: 6: Bad file descriptor ../configure: 12651: no: not found ../configure: 12651: 5: Bad file descriptor ../configure: 12651: :: checking for __gethostname in -lnsl: not found ../configure: 12651: 6: Bad file descriptor ../configure: 12651: checking for __gethostname in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12651: ac_fn_c_try_link: not found ../configure: 12651: 5: Bad file descriptor ../configure: 12651: :: result: no: not found ../configure: 12651: 6: Bad file descriptor ../configure: 12651: no: not found ../configure: 12658: ac_fn_c_check_func: not found ../configure: 12669: ac_fn_c_check_func: not found ../configure: 12819: 5: Bad file descriptor ../configure: 12819: :: checking for gethostbyaddr in -lnsl: not found ../configure: 12819: 6: Bad file descriptor ../configure: 12819: checking for gethostbyaddr in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12819: ac_fn_c_try_link: not found ../configure: 12819: 5: Bad file descriptor ../configure: 12819: :: result: no: not found ../configure: 12819: 6: Bad file descriptor ../configure: 12819: no: not found ../configure: 12819: 5: Bad file descriptor ../configure: 12819: :: checking for __gethostbyaddr in -lnsl: not found ../configure: 12819: 6: Bad file descriptor ../configure: 12819: checking for __gethostbyaddr in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12819: ac_fn_c_try_link: not found ../configure: 12819: 5: Bad file descriptor ../configure: 12819: :: result: no: not found ../configure: 12819: 6: Bad file descriptor ../configure: 12819: no: not found ../configure: 12826: ac_fn_c_check_func: not found ../configure: 12837: ac_fn_c_check_func: not found ../configure: 12987: 5: Bad file descriptor ../configure: 12987: :: checking for yp_get_default_domain in -lnsl: not found ../configure: 12987: 6: Bad file descriptor ../configure: 12987: checking for yp_get_default_domain in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12987: ac_fn_c_try_link: not found ../configure: 12987: 5: Bad file descriptor ../configure: 12987: :: result: no: not found ../configure: 12987: 6: Bad file descriptor ../configure: 12987: no: not found ../configure: 12987: 5: Bad file descriptor ../configure: 12987: :: checking for __yp_get_default_domain in -lnsl: not found ../configure: 12987: 6: Bad file descriptor ../configure: 12987: checking for __yp_get_default_domain in -lnsl... : not found cat: confdefs.h: No such file or directory ../configure: 12987: ac_fn_c_try_link: not found ../configure: 12987: 5: Bad file descriptor ../configure: 12987: :: result: no: not found ../configure: 12987: 6: Bad file descriptor ../configure: 12987: no: not found ../configure: 12995: ac_fn_c_check_func: not found ../configure: 13006: ac_fn_c_check_func: not found ../configure: 13156: 5: Bad file descriptor ../configure: 13156: :: checking for dlopen in -ldl: not found ../configure: 13156: 6: Bad file descriptor ../configure: 13156: checking for dlopen in -ldl... : not found cat: confdefs.h: No such file or directory ../configure: 13156: ac_fn_c_try_link: not found ../configure: 13156: 5: Bad file descriptor ../configure: 13156: :: result: no: not found ../configure: 13156: 6: Bad file descriptor ../configure: 13156: no: not found ../configure: 13156: 5: Bad file descriptor ../configure: 13156: :: checking for __dlopen in -ldl: not found ../configure: 13156: 6: Bad file descriptor ../configure: 13156: checking for __dlopen in -ldl... : not found cat: confdefs.h: No such file or directory ../configure: 13156: ac_fn_c_try_link: not found ../configure: 13156: 5: Bad file descriptor ../configure: 13156: :: result: no: not found ../configure: 13156: 6: Bad file descriptor ../configure: 13156: no: not found ../configure: 13164: 5: Bad file descriptor ../configure: 13164: :: checking for sin in -lm: not found ../configure: 13164: 6: Bad file descriptor ../configure: 13164: checking for sin in -lm... : not found cat: confdefs.h: No such file or directory ../configure: 13196: ac_fn_c_try_link: not found ../configure: 13198: 5: Bad file descriptor ../configure: 13198: :: result: no: not found ../configure: 13198: 6: Bad file descriptor ../configure: 13198: no: not found ../configure: 13214: ac_fn_c_check_func: not found ../configure: 13225: ac_fn_c_check_func: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: checking for inet_aton in -lresolv: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: checking for inet_aton in -lresolv... : not found cat: confdefs.h: No such file or directory ../configure: 13510: ac_fn_c_try_link: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: result: no: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: no: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: checking for __inet_aton in -lresolv: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: checking for __inet_aton in -lresolv... : not found cat: confdefs.h: No such file or directory ../configure: 13510: ac_fn_c_try_link: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: result: no: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: no: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: checking for inet_aton in -lbind: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: checking for inet_aton in -lbind... : not found cat: confdefs.h: No such file or directory ../configure: 13510: ac_fn_c_try_link: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: result: no: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: no: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: checking for __inet_aton in -lbind: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: checking for __inet_aton in -lbind... : not found cat: confdefs.h: No such file or directory ../configure: 13510: ac_fn_c_try_link: not found ../configure: 13510: 5: Bad file descriptor ../configure: 13510: :: result: no: not found ../configure: 13510: 6: Bad file descriptor ../configure: 13510: no: not found ../configure: 13516: 5: Bad file descriptor ../configure: 13516: :: checking for ANSI C header files: not found ../configure: 13516: 6: Bad file descriptor ../configure: 13516: checking for ANSI C header files... : not found cat: confdefs.h: No such file or directory ../configure: 13615: ac_fn_c_try_compile: not found ../configure: 13617: 5: Bad file descriptor ../configure: 13617: :: result: no: not found ../configure: 13617: 6: Bad file descriptor ../configure: 13617: no: not found ../configure: 13665: ac_cv_header_dirent_dirent.h: not found ../configure: 13665: 5: Bad file descriptor ../configure: 13665: :: checking for dirent.h that defines DIR: not found ../configure: 13665: 6: Bad file descriptor ../configure: 13665: checking for dirent.h that defines DIR... : not found eval: 1: Bad substitution

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  • File Sharing: User-created folders are read-only to others on Mac 10.6 Server

    - by Anriëtte Combrink
    Hi there We recently got a new Mac Mini Server with 10.6 Server on it. It has two 500GB volumes, one of which [Macintosh HD2 the extra one other than the boot disk] we are using to share our work files. I have added a user account for each user in the Users pane on Server Preferences, and all our staff (users added to the system) are added to a new group, called toolboxstaff. Now, when a user creates a new folder on this volume, folders are created with read-only access for everyone else besides the owner. How do I set it that when a user creates a folder, it creates it with RW access for the toolboxstaff group? Thanks in advance.

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  • Delphi Exception handling problem with multiple Exception handling blocks

    - by Robert Oschler
    I'm using Delphi Pro 6 on Windows XP with FastMM 4.92 and the JEDI JVCL 3.0. Given the code below, I'm having the following problem: only the first exception handling block gets a valid instance of E. The other blocks match properly with the class of the Exception being raised, but E is unassigned (nil). For example, given the current order of the exception handling blocks when I raise an E1 the block for E1 matches and E is a valid object instance. However, if I try to raise an E2, that block does match, but E is unassigned (nil). If I move the E2 catching block to the top of the ordering and raise an E1, then when the E1 block matches E is is now unassigned. With this new ordering if I raise an E2, E is properly assigned when it wasn't when the E2 block was not the first block in the ordering. Note I tried this case with a bare-bones project consisting of just a single Delphi form. Am I doing something really silly here or is something really wrong? Thanks, Robert type E1 = class(EAbort) end; E2 = class(EAbort) end; procedure TForm1.Button1Click(Sender: TObject); begin try raise E1.Create('hello'); except On E: E1 do begin OutputDebugString('E1'); end; On E: E2 do begin OutputDebugString('E2'); end; On E: Exception do begin OutputDebugString('E(all)'); end; end; // try() end;

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  • Delph Exception handling problem with multiple Exception handling blocks

    - by Robert Oschler
    I'm using Delphi Pro 6 on Windows XP with FastMM 4.92 and the JEDI JVCL 3.0. Given the code below, I'm having the following problem: only the first exception handling block gets a valid instance of E. The other blocks match properly with the class of the Exception being raised, but E is unassigned (nil). For example, given the current order of the exception handling blocks when I raise an E1 the block for E1 matches and E is a valid object instance. However, if I try to raise an E2, that block does match, but E is unassigned (nil). If I move the E2 catching block to the top of the ordering and raise an E1, then when the E1 block matches E is is now unassigned. With this new ordering if I raise an E2, E is properly assigned when it wasn't when the E2 block was not the first block in the ordering. Note I tried this case with a bare-bones project consisting of just a single Delphi form. Am I doing something really silly here or is something really wrong? Thanks, Robert type E1 = class(EAbort) end; E2 = class(EAbort) end; procedure TForm1.Button1Click(Sender: TObject); begin try raise E1.Create('hello'); except On E: E1 do begin OutputDebugString('E1'); end; On E: E2 do begin OutputDebugString('E2'); end; On E: Exception do begin OutputDebugString('E(all)'); end; end; // try() end;

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  • Design Pattern for error handling in ASP.NET 3.5 site

    - by Kevin
    I am relatively new to ASP.NET programming, and web programming in general. We have a site we recently ported from .NET 1.1 to 3.5. Currently we have two methods of error handling: either catching the error during data load on a page and displaying the formatted error in a label on the page, or redirecting to a generic error page. Both of these are somewhat annoying, as right now I'm trying to redesign how our errors are displayed. We are soon moving to Master pages, and I'm wondering if there is a way to "build in" an error handling control. What I mean by this is using a ASP.NET user control I've designed that simply gets passed the error string returned from the server. If an error occurs, the page would not display the content, and instead display the error control. This provides us with the ability to retain the current banner/navigation during an error (which we don't get with the generic error page), as well as keeping me from having to add the control to every aspx page we have (which I have to do with using the label-per-page system). Does something like this make sense? Ultimately I just want to have the error control added to a single page, and all other pages have access to it directly. Is this something Master pages help with? Thanks!

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  • Centralized Exception handling for Eclipse plug-in

    - by Svilen
    Hello, At first I thought this would be question often asked, however trying (and failing) to look up info on this proved me wrong. Is there a mechanism in Eclipse platform for centralized exception handling of exceptions? For example... You have plug-in project which connects to a DB and issues queries, results of which are used to populate some e.g. views. This is like the most common example ever. :) Queries are executed almost for any user action, from every UI control the plug-in provides. Most likely the DB Query API will have some specific to the DB SomeDBGeneralException declared as being thrown by it. That's OK, you can handle those according to whatever your software design is. But how about unchecked exceptions which are likely to occur, e.g. , when communication with DB suddenly breaks for some network related reason? What if in such case one would like to catch those exceptions in a central place and for example provide user friendly message to the user (rather than the low level communication protocol api messages) and even some possible actions the user could execute in order to deal with the specific problem? Thinking in Eclipse platform context, the question may be rephrased as "Is there an extension point like "org.eclipse.ExceptionHandler" which allows to declare exception handlers for specific (some kind of filtering support) exceptions giving a lot of flexibility with the actual handling?"

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  • Using callback functions for error handling in C

    - by Earlz
    Hi, I have been thinking about the difficulty incurred with C error handling.. like who actually does if(printf("hello world")==-1){exit(1);} But you break common standards by not doing such verbose, and usually useless coding. Well what if you had a wrapper around the libc? like so you could do something like.. //main... error_catchall(my_errors); printf("hello world"); //this will automatically call my_errors on an error of printf ignore=1; //this makes it so the function will return like normal and we can check error values ourself if(fopen.... //we want to know if the file opened or not and handle it ourself. } int my_errors(){ if(ignore==0){ _exit(1); //exit if we aren't handling this error by flagging ignore } return 0; //this is called when there is an error anywhere in the libc } ... I am considering making such a wrapper as I am synthesizing my own BSD licensed libc(so I already have to touch the untouchable..), but I would like to know what people think about it.. would this actually work in real life and be more useful than returning -1?

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  • [C#] how to do Exception Handling & Tracing

    - by shrimpy
    Hi all, i am reading some C# books, and got some exercise don't know how to do, or not sure what does the question mean. Problem: After working for a company for some time, your skills as a knowledgeable developer are recognized, and you are given the task of “policing” the implementation of exception handling and tracing in the source code (C#) for an enterprise application that is under constant incremental development. The two goals set by the product architect are: 100% of methods in the entire application must have at least a standard exception handler, using try/catch/finally blocks; more complex methods must also have additional exception handling for specific exceptions All control flow code can optionally write “tracing” information to assist in debugging and instrumentation of the application at run-time in situations where traditional debuggers are not available (eg. on staging and production servers). (i am not quite understand these criterias, i came from the java world, java has two kind of exception, check and unchecked exception. Developer must handle checked exception, and do logging. about unchecked exception, still do logging maybe, but most of the time we just throw it. however here comes to C#, what should i do????) Question for Problem: List rules you would create for the development team to follow, and the ways in which you would enforce rules, to achieve these goals. How would you go about ensuring that all existing code complies with the rules specified by the product architect; in particular, what considerations would impact your planning for the work to ensure all existing code complies?

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  • fcgiwrap listening to a unix socket file: how to change file permissions

    - by user36520
    I have a web server (nginx) and a CGI application (gitweb) that is ran with fcgiwrap to enable Fast CGI access to it. I want the Fast CGI protocol to take place over a unix socket file. To start the fcgiwrap daemon, I run: setuidgid git fcgiwrap -s "unix:$PWD/fastcgi.sock" (this is a daemontools daemon) The problem is that my web server runs as the user www-data and not the user git. And fcgiwrap creates the socket fastcgi.sock with user git, group git and read only fort the non owner. Thus, nginc with the user www-data can't access the socket. Apparently, fcgiwrap is not able to select permissions of unix socket files. And this is quite annoying. Moreover, if I manage to have the socket file exists before I run fcgiwrap (which is quite difficult given I did not find any shell command to create a socket file), it quits with the following error: Failed to bind: Address already in use The only solution I found is to start the server the following way: rm -f fastcgi.sock # Ensure that the socket doesn't already exists (sleep 5; chgrp www-data fastcgi.sock; chmod g+w fastcgi.sock) & exec setuidgid git fcgiwrap -s "unix:$PWD/fastcgi.sock" Which is far from the most elegant solution. Can you think of anything better ? Thanks

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  • Nautilus and file command in 11.04 don't show metadata for WebM files

    - by Pili
    The file-name extension .webm is used for media files using the WebM multimedia format, which consists of the WebM container (a subset of the Matroska container) and audio and video streams with independet enconding and quality settings. Description of the issue: For files in the WebM format, the program file says that files are raw data, instead of determining and displaying the real file-format, which is WebM. Besides, Nautilus doesn't display the technical metadata of files in this format. Why is the file program not displaying the file format for WebM files?

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  • How to add extensions to a lot of files using content of each file?

    - by v8media
    I've got over 10,000 files that don't have extensions from older versions of the Mac OS. They're extremely nested, and they also have all sorts of strange formatting and characters. They don't have file types or creator codes attached to them any longer. A great deal of these files have text in the file that will let me determine extensions (for example Word.Document.8 is in every file created by that version of Word, and Excel.Sheet.8 in every file created with that version of Excel). I found a script that looks like it would work for one of these file types at a time, but it erases parts of filenames after nefarious characters, which is not good. find . -type f -not -name "." -print0 |\ xargs -0 file |\ grep 'Word.Document.8' |\ sed 's/:.*//' |\ xargs -I % echo mv % %.doc So, two questions from that: One is, should I clean the characters in the filenames first, or programmatically deal with those in the script in order to leave them the same? As long as I lose no information from the filenames, I don't see a problem cleaning out slashes and other problem characters. Also, if I clean the filenames, there are likely to be duplicates, so any cleaning script would have to add something like "-1" before the extension to make sure nothing gets lost. 2nd question is how do I change the script so that it will look for more than one file type at the same time and give each the proper extension? I'm not tied to this script, but it is understandable, which is a pro. Mac OS X 10.6 is installed on this file server, but I've got access to any recent versions of OS X. Thanks, Ian

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