分类:常见Bug

  • What is pipes/conduit trying to solve

    Lazy IO Lazy IO works like this readFile :: FilePath -> IO ByteString where ByteString is guaranteed to only be read chunk-by-chunk. To do so we could (almost) write -- given `readChunk` whi...

    2 分钟前
  • Intellij IDEA Project view doesn't show structure as it did before.

    I've come across this problem a few times myself. What happened is that intellij lost the module in my project settings. Here's my steps to fix it: File -> Project Structure -> Click on modul...

    17 分钟前
  • C char* to int conversion

    atoi can do that for you Example: char string[] = "1234"; int sum = atoi( string ); printf("Sum = %d\n", sum ); // Outputs: Sum = 1234 ...

    22 分钟前
  • Testing an adb update, versus install?

    You don't need to re-install to get a 'clean install', you can just wipe the application's data. Go to Settings > Applications > Find your app and use 'clear data' (or similar). At that point y...

    27 分钟前
  • Using setInterval() to do simplistic continuous polling

    From my comment: I would use setTimeout [docs] and always call it when the previous response was received. This way you avoid possible congestion or function stacking or whatever you want to call it,...

    32 分钟前
  • The forgotten assignment operator “=” and the commonplace “:=”

    In PL/PgSQL parser, assignment operator is defined as assign_operator : '=' | COLON_EQUALS ; This is a legacy feature, present in source code since 1998, when it wa...

    42 分钟前
  • Object cannot be cast from DBNull to other types

    I'm thinking that your output parameter is coming back with a DBNull value. Add a check for that like this var outputParam = dataAccCom.GetParameterValue(IDbCmd, "op_Id"); if(!(outputParam is DBNul...

    1 小时前
  • After changing /etc/profile, what do I have to do to reset my shell?

    use source /etc/profile for details, man source or you can checkout this link http://bash.cyberciti.biz/guide/Source_command...

    1 小时前
  • Android BroadcastReceiver within Activity

    What do I do wrong? The source code of ToastDisplay is OK (mine is similar and works), but it will only receive something, if it is currently in foreground (you register receiver in onResume). Bu...

    1 小时前
  • Web sockets make ajax/CORS obsolete?

    WebSockets will not make AJAX entirely obsolete and WebSockets can do cross-domain. AJAX AJAX mechanisms can be used with plain web servers. At its most basic level, AJAX is just a way for a web pag...

    1 小时前
  • Is there a virt-manager alternative for Mac OS X? [closed]

    There's now a brew formula homebrew-virt-manager which I've used to successfully connect to a CentOS 5 box running qemu+kvm. brew tap jeffreywildman/homebrew-virt-manager brew install virt-manager ...

    1 小时前
  • How do I exclude/rename some classes from import in Scala?

    The _ has to be put at the end - not at the beginning: Exclude Map and Set from the import import scala.collection.mutable.{Map => _, Set => _, _} Exclude Set and rename Map to ScalaMutable...

    1 小时前
  • Difference between UTC and GMT Standard Time in .NET

    GMT does not adjust for Daylight saving time (DST). You can hear it from the horse's mouth on this web site. Add this line of code to see the source of the problem: Console.WriteLine(TimeZoneIn...

    1 小时前
  • How do I test a WHOLE string against regex in ruby?

    You can match the beginning of the string with \A and the end with \Z. In ruby ^ and $ match also the beginning and end of the line, respectively: >> "a\na" =~ /^a$/ => 0 >> "a\na" =...

    1 小时前
  • <strong> vs <em>?

    Yeah, the definition of what ‘strong emphasis’ is compared to just ‘emphasis’ is pretty woolly. The only standard definition would be “it's emphasised, but more!!”. Personally I use &lt;em&gt; for no...

    2 小时前
  • Distinguishing between Java threads and OS threads?

    On Linux, Java threads are implemented with native threads, so a Java program using threads is no different from a native program using threads. A "Java thread" is just a thread belonging to a JVM pr...

    2 小时前
  • How to insert a blob into a database using sql server management studio

    You can insert into a varbinary(max) field using T-SQL within SQL Server Management Studio and in particular using the OPENROWSET commmand. For example: INSERT Production.ProductPhoto ( Thumb...

    2 小时前
  • How to Write OS X Finder plugin

    Sadly, programming a Finder plugin actually does still require getting your hands dirty with COM. If you look at the SCFinderPlugin subproject of the SCPlugin project, you will find that it follows e...

    2 小时前
  • Is there a better way to determine elapsed time in Perl?

    Possibly. Depends on what you mean by "better". If you are asking for a "better" solution in terms of functionality, then this is pretty much it. If you are asking for a "better" in the sense of "le...

    2 小时前
  • Using system environment variables in log4j xml configuration

    This syntax is documented only in log4j 2.X so make sure you are using the correct version. It does not work on the 1.X versions. &lt;Appenders&gt; &lt;File name="file" fileName="${env:LOG...

    2 小时前

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