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Search found 7722 results on 309 pages for 'pitfalls to avoid'.

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• Warning produced by f#: value has been copied to ensure the original is not mutated

  - by user1878761

  The first definition below produces the warning in the title when compiled with f# 3.0 and the warning level set to 5. The second definition compiles cleanly. I wondered if someone could please explain just what the compiler worries I might accidentally mutate, or how would splitting the expression with a let clause help avoid that. Many thanks. let ticks_with_warning () : int64 = System.DateTime.Now.Ticks let ticks_clean () : int64 = let t = System.DateTime.Now t.Ticks

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• sending mail this way???

  - by Sachindra

  <form enctype="multipart/form-data" method="post" action="mailto:[email protected]" accept-charset="UTF-8"> Is there a problem if mails are sent this way .. i wanna avoid using PHP codes..

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• ViewStateMode in ASP.NET 4.0 - backward compatibility?

  - by rkrauter

  Was the new ViewStateMode property introduced to avoid breaking the existing EnableViewState? Does setting EnableViewState = false at the page level causee the ViewStateMode setting to be ignored? PS: What is CW in stackoverflow?

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• Working with the IE cache from C# & WPF

  - by Eric

  I'm writing a program in C# using the WPF framework. I need to display images, and I'd like to cache them to avoid downloading them constantly. I can code my own cache, however, IE already has a caching system. I can find code to read entries out of the IE cache, however I've found nothing dealing with the issue of adding items to the cache. Is there a good way to do it, or should I just implement a separate cache?

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• Why is this event declared with an anonymous delegate?

  - by John_Sheares

  I have seen people define their events like this: public event EventHandler<EventArgs> MyEvent = delegate{}; Can somebody explain how this is different from defining it without it? Is it to avoid checking for null when raising the event?

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• Java Download Concurrent Data

  - by xger86x

  Hi, i'm developing an app which download map tiles around different places in a city. To do this, i have one thread for each place in which i select the tiles and create a thread to download each. Well, the question is how to avoid creating a thread for a tile that already exists in the thread pool. Should not just check if the file exists, since it is possible that the thread for that tile already exists (other place already need that tile) but the file has not been created- Any idea? Thanks

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• Migrate MySQL database to Sql Server

  - by RPK

  I recently encountered a problem in my production database due to MySQL bug. The bug is in the TimeStamp column. To avoid any inconvenience, I want to migrate the database to either Sql Server. Is there any FREE tool to easily and reliably migrate data and table structures?

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• drupal POST Content-Length exceeds the limit

  - by Arun

  hi i got list of warning regarding file size when i try to upload an image using file upload. "POST Content-Length of 12223490 bytes exceeds the limit of 8388608 bytes in Unknown on line 0" My question is how to avoid displaying warning messages (i got 5 warnings).

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• In symfony how to use template from another context, i.e. get frontend template form backend

  - by eldar

  It's need for preview function in backend. I want to avoid duplicating templates. // in some backend module action $this->setTemplate(sfConfig::get('sf_apps_dir').'/frontend/modules/module/templates/tpl'); because context is backend, how about partials in tpl, routes and so forth?

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• An error has Occurred During Report proccesing

  - by Erez

  hi , When I'm running the report I'm getting that message above. The Report Works fine when I press the "Run Report" Button but I want also to avoid that annoying message that appears when the page loads. I've tried to set the report viewer control to Enable = false; and only after hitting the button to Enable = true; but it didn't work.

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• Way to get unsigned char into a std::string without reinterpret_cast?

  - by WilliamKF

  I have an unsigned char array that I need in a std::string, but my current way uses reinterpret_cast which I would like to avoid. Is there a cleaner way to do this? unsigned char my_txt[] = { 0x52, 0x5f, 0x73, 0x68, 0x7e, 0x29, 0x33, 0x74, 0x74, 0x73, 0x72, 0x55 } unsigned int my_txt_len = 12; std::string my_std_string(reinterpret_cast<const char *>(my_txt), my_txt_len);

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• Field validators in asp.net

  - by user279521

  Is it possible to have "Required Field Validator" controls to validate more than one field (example I have 12 textboxes that are required. I want to try an avoid having 12 RFV controls.

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• How can Perl's print add a newline by default?

  - by Mike

  In Perl most of my print statements take the form print "hello." . "\n"; Is there a nice way to avoid keeping all the pesky "\n"s lying around? I know I could make a new function such as myprint that automatically appends \n, but it would be nice if I could override the existing print.

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• Why SVN makes read-only my files after check out or update?

  - by eKek0

  Working with an standard configuration of the server, without any lock, my files are read-only after every check out or update to the working copy. I have to set them to be not read-only to continue working, but besides this shouldn't be happening, it's uncomfortable. Anybody knows how to avoid this behavior?

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• Disable action if textarea is empty

  - by mymlyn

  Could I somehow disable action (send, redirect) from submit if the textarea was empty (so nothing at all happens onclick). I want to avoid displaying error here, thats why I'm asking. My textarea: <textarea id="message" name="message" maxlength="35"></textarea> My submit button: <input id="send" type="image" src="/site_media/static/images/submit.png" value="Submit"> This is what i tried: http://jsfiddle.net/5Xwyb/ My brain died couple of hours ago.

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• Is there a programmatic way to determine whether the file is being used?

  - by AngryHacker

  Case and point: I need to open an Excel file via Interop and it would help a lot to avoid ugly COM errors if I knew that the file was in use. Other than trying to open the file and catching the exception, is there a programmatic way to determine whether the file is in use?

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• Display different content for anonymous and logged in users

  - by Jukebox

  What I need to accomplish is: If an anonymous user visits the site, show regular site content. If a user logs in to the site, then user-related content appears in place of the regular content. I would like to accomplish this using the Views module. I have looked at the Premium module, but it seems to be abandoned. I would like to avoid using the content-access module if at all possible, since I already have other access controls in place.

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• For HTML Emails, How to embed images so users don't get a download prompt

  - by nobosh

  I'm working to create an HTML email which includes 2 images. Currently, I'm using tags to place the image in the email. Problem is when users get the email, it's asking the user to "click to download" for security reasons. Is there a way to embed the image in the email, to avoid this issue? I'm using Coldfusion to send the email. Thanks

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• iPhone Coredata saving error

  - by satyam

  I'm trying to create core data application. Some times when trying to save data, i'm seeing following error: Error: NSInvalidArgumentException, Reason: * -_referenceData64 only defined for abstract class. Define -[NSTemporaryObjectID_default _referenceData64]!, Description: * -_referenceData64 only defined for abstract class. Define -[NSTemporaryObjectID_default _referenceData64]! I didn't understand why this error is coming and how to avoid it. Can some one help me please.

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• Is there a way to make eclipse report a general "catch (Exception e)" as an error/warning (in java)?

  - by Rog

  I'm trying to encourage a best practice of not catching general exceptions in Java code. eg: try { ... } catch (Exception e) { // bad! ... } Is there a way to flag this as an error/warning in Eclipse? I know PMD picks this up, but I'd rather avoid integrating it into everyone's build environment at the moment.

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• When should you not use virtual destructors?

  - by Mag Roader

  Is there ever a good reason to not declare a virtual destructor for a class? When should you specifically avoid writing one?

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• Passing DataSource object from a servlet to a JavaBean

  - by Slavko

  I like the ease of using @Resource annotation to get a DataSource, but as far as I know, it's not possible to use it in a regular JavaBean. Would it be considered a bad practice if I pass the DataSource object from a servlet to a bean along with the other data to avoid having that lookup code in the bean?

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• Double operation problem Java

  - by Daniel G. R.

  When I do the following in Java: System.out.println(2.2-2.0); It unexpectedly prints the following: 0.20000000000000018 What is this and how can I avoid this?

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• XSLT for-each loop for element collection

  - by brain_pusher

  Is it possible to make a for-each loop in XSLT not for a node set, but for my own collection of elements? For example, I split some string and have a string collection as a result. And I need to create a node for each item in the collection. I know that issue can be solved with a recursive template, but I want to know if it is possible to avoid a recursion.

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• __do_global_dtors_aux in C

  - by Amazon

  I'm compiling a C program for a MIPS embedded system. GCC keeps sticking in stuff like __do_global_dtors_aux, frame_dummy, __do_global_ctors_aux. How can I avoid that?

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