{"id":6925,"date":"2014-05-11T17:46:01","date_gmt":"2014-05-11T17:46:01","guid":{"rendered":"https:\/\/unknownerror.org\/index.php\/2014\/05\/11\/problem-about-filehandle-collection-of-common-programming-errors\/"},"modified":"2014-05-11T17:46:01","modified_gmt":"2014-05-11T17:46:01","slug":"problem-about-filehandle-collection-of-common-programming-errors","status":"publish","type":"post","link":"https:\/\/unknownerror.org\/index.php\/2014\/05\/11\/problem-about-filehandle-collection-of-common-programming-errors\/","title":{"rendered":"problem about filehandle-Collection of common programming errors"},"content":{"rendered":"<ul>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/3593e929f1d8d61d5e32215b2965a474?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nRussell C<br \/>\npython hashtable irc filehandle<br \/>\nSo I&#8217;m working on a script that will automatically download certain files from IRC XDCC bots when run. These requests are asynchronous and there can be a varying number, depending on a config file so I wanted to keep the file handles in a hash table or library so they could easily be referenced based on who the file sender was and the file they are sending (read during a triggered event). Python is complaining saying SyntaxError: can&#8217;t assign to function call so I&#8217;m guessing it won&#8217;t work quit<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/7d0d66b076e3bc70819e50f8a25af8df?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJonathan Leffler<br \/>\nc++ c stdout filehandle<br \/>\nI have a Windows C++ program that is doing something like:FILE* pf = &#8230;;*stdout = *pf; \/\/ stdout is defined in stdio.hI&#8217;m looking for an explanation about what happens when you change the value of the stdout file handle. Is this just a way of redirecting stdout?-cr<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/edd8638efe875601bfe394a8aea5b16d?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nbrian d foy<br \/>\nperl arrays filehandle<br \/>\nI quickly jotted off a Perl script that would average a few files with just columns of numbers. It involves reading from an array of filehandles. Here is the script:#!\/usr\/local\/bin\/perluse strict; use warnings;use Symbol;die &#8220;Usage: $0 file1 [file2 &#8230;]\\n&#8221; unless scalar(@ARGV);my @fhs;foreach(@ARGV){my $fh = gensym;open $fh, $_ or die &#8220;Unable to open \\&#8221;$_\\&#8221;&#8221;;push(@fhs, $fh); }while (scalar(@fhs)){my ($result, $n, $a, $i) = (0,0,0,0);while ($i &lt;= $#fhs){if ($a = &lt;$fhs[$i]&gt;){$result +=<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/0a041da7fe14e3e143c52eb1da05a385?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nZaid<br \/>\nperl filehandle<br \/>\nplease look at the following code first.#! \/usr\/bin\/perl package foo;sub new {my $pkg = shift;my $self = {};my $self-&gt;{_fd} = undef;bless $self, $pkg;return $self; }sub Setfd {my $self = shift;my $fd = shift;$self_-&gt;{_fd} = $fd; }sub write {my $self = shift;print $self-&gt;{_fd} &#8220;hello word&#8221;; }my $foo = new foo;My intention is to store a file handle within a class using hash. the file handle is undefined at first, but can be initilized afterwards by calling Setfd function. then write can b<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/aac93ecca01044d0ff93aa8e8ce16eda?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nJean<br \/>\nperl file filehandle<br \/>\nIn the following code if there is space between FILE and ( in the printf statement likeprintf FILE (&#8220;Test string inline\\n&#8221;);Perl will treat FILE as a filehandle otherwise printf FILE(&#8220;Test string inline\\n&#8221;);will be treated as subroutine call(If no subroutine is defined by FILE perl will through an error Undefined subroutine &amp;main::FILE called at .\/test.pl line xx ). Isn&#8217;t there a better way Perl can implement this ? (Maybe this is why bareword filehandles are considered outdated ?)#!\/usr\/bi<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/c508333ccd6dde1d7b5efcc2fb87aa84?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nMohamedMansour<br \/>\njava c++ dll jni filehandle<br \/>\nI made JNI functions and linked them with the c++ dynamic library successfully. I got all of them working just fine, but I had an issue for one function, I got symbol lookup error from the FileHandle class that I used in the c++ that I use to read data from file. Knowing that it&#8217;s working on a normal c++ project, but not in the DLL.\/usr\/lib\/jvm\/jdk1.7.0\/bin\/java: symbol lookup error: \/home\/&#8230;\/NetBeansProjects\/TRIOGUI\/dist\/libNativeAdd.so: undefined symbol: _ZN5Gdsii9GdsParserC1EPKcN7SoftJin10Fi<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/3cfa434f4bbf0460208ac8cf911e5fee?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nforsvarir<br \/>\nc visual-c++ stream filehandle fflush<br \/>\nI&#8217;m trying to run some code but fflush() with the error:Invalid file descriptor. File possibly closed by a different threadHere is the relevant part of the code:fhandle = fopen(&#8220;dbfile.bin&#8221;, &#8220;rbc&#8221;);\/* There is a valid dbfile.bin file &#8211; get file size *\/_fstat(_fileno(fhandle), &amp;file_stat);printf(&#8220;dbfile.bin size = %d\\n&#8221;, file_stat.st_size);g_tpd_list = (tpd_list*)calloc(1, file_stat.st_size);if (!g_tpd_list){rc = MEMORY_ERROR;}else{fread(g_tpd_list, file_stat.st_size, 1, fhandle);fflush(fhand<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/bfb828df0c992a11e1b362a1a064e71d?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nuser1465767<br \/>\nfor-loop openmp filehandle gz<br \/>\ntest.fa.gz file contains multiple 4 lines as blow:@HWI-ST298:420:B08APABXX:3:1101:1244:2212 1:N:0:TCATTC GGCAAGGCACTTACTTTACAGCTAAAGAAGTGCAGC + @@@FDFFDFHCFDACGHC&lt;&lt;CCFEHHFCCFCEE:C?What I want to do is to read every four lines of *.fq.gz file in parallel with OpenMP. The code blow could be compiled successfully, but will show incorrect results sometimes. In each for loop, I used 4 times of getline() to read the file. I&#8217;m not sure how OpenMP will handle the multiple jobs in each for loop and<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/a83572382e18c7f160bb1c0ea43f98ee?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nKurt W. Leucht<br \/>\nperl string multiline filehandle<br \/>\nI&#8217;m trying to figure out the proper PBP approved way to process a multi line string one line at a time. Many Perl coders suggest treating the multi line string as a filehandle, which works fine unless you have &#8220;use strict&#8221; in your script. Then you get a warning from the compiler about not being able to use a string as a symbol while strict refs is in use.Here&#8217;s a simple working example of the problem:#use strict; use warnings; my $return = `dir`; my $ResultsHandle = &#8220;&#8221;; my $matchLines = &#8220;&#8221;; my<\/li>\n<li><img decoding=\"async\" src=\"http:\/\/www.gravatar.com\/avatar\/ad6886c7ce176df1a29809313bd5cdec?s=32&amp;d=identicon&amp;r=PG\" \/><br \/>\nuser2145514<br \/>\njava serialization libgdx filehandle<br \/>\nWhen trying to execute this piece of code:public void load(String filename) { FileHandle file =Gdx.files.external(filename + &#8220;.bim&#8221;); Json json = new Json();String text = file.readString(); datamap.clear(); datamap =json.fromJson(HashMap.class, text);I get an error:Exception in thread &#8220;LWJGL Application&#8221;com.badlogic.gdx.utils.GdxRuntimeException:com.badlogic.gdx.utils.SerializationException: Class cannot be created(missing no-arg constructor): com.bvo.easyBim.Model.Cursor atcom.badlog<\/li>\n<\/ul>\n<p>Web site is in building<\/p>\n<p>I discovery a place to host code\u3001demo\u3001 blog and websites.<br \/>\nSite access is fast but not money<\/p>\n<p><img decoding=\"async\" src=\"http:\/\/www.m5zn.com\/newuploads\/2014\/01\/30\/jpg\/e7da807964b1fff.jpg\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Russell C python hashtable irc filehandle So I&#8217;m working on a script that will automatically download certain files from IRC XDCC bots when run. These requests are asynchronous and there can be a varying number, depending on a config file so I wanted to keep the file handles in a hash table or library so [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-6925","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/6925","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/comments?post=6925"}],"version-history":[{"count":0,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/posts\/6925\/revisions"}],"wp:attachment":[{"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/media?parent=6925"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/categories?post=6925"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/unknownerror.org\/index.php\/wp-json\/wp\/v2\/tags?post=6925"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}