erlang

问题 Documentation says that make_ref() -> ref() Returns an almost unique reference. The returned reference will re-occur after approximately 2 82 calls; therefore it is unique enough for practical purposes. But my eyes tell me that between VM restarts I could easily get the same ref: [~] erl Erlang R14B04 (erts-5.8.5) 1> make_ref(). #Ref<0.0.0.33> 2> make_ref(). #Ref<0.0.0.37> ^C [~] erl Erlang R14B04 (erts-5.8.5) 1> make_ref(). #Ref<0.0.0.33> So, how unique Erlang’s Refs are? Are they suitable

问题 I am having no problem converting a string to a byteArray of UTF-16 encoded characters, but the application I am trying to communicate with (written in Erlang) only understands Latin-1 encoding. Is there any way of producing a byteArray full of Latin-1 character codes from a string within Actionscript 3? 回答1: byteArray.writeMultiByte(string, "iso-8859-1"); http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/utils/ByteArray.html#writeMultiByte() 来源： https://stackoverflow.com

问题 I'm slowly falling in love with Erlang, and only have one big, BIG problem. I'm a big fan of languages like Standart ML and ocaml with their strong static typechecking. is there a nice and clean way to introduce somesort of static typechecking in erlang. I'm looking at the -type and -spec annotations. Does anyone have a nice solution? 回答1: I've been there! I love both OCaml and Erlang and use them regularly. By the time I started using Erlang I had years of experience with OCaml. It took me

问题 I have installed RabbidMQ but when i try to use rabbitmqctl status in cmd i have next result : D:\RabbitMQ\rabbitmq_server-3.6.2\sbin>rabbitmqctl status Error: Failed to initialize erlang distribution: {{shutdown, {failed_to_start_child, net_kernel, {'EXIT',nodistribution}}}, {child,undefined, net_sup_dynamic, {erl_distribution, start_link, [['rabbitmq-cli-70', shortnames]]}, permanent,1000,supervisor, [erl_distribution]}}. Folder with Erlang : D:\erl7.3 I have following environment variables

问题 I've got a newbie question. I'm trying to parse a xml message with pattern matching in functions A sample of a message is: <msg> <action type="xxx"... /> </msg> What I would like to able to do is ( sort of ) decode_msg_in( << $<,$m,$s,$g,$>, Message/binary, $<,$/,$m,$s,$g,$> >>, R ) -> The decode does not work (obviously, it's only a indication on what I'd like to do ) Is this even possible? Does anyone have an idea? Or do I need to "iterate" the whole message as a list, building new "words"

问题 I have installed Ejabberd with odbc_mysql before, but I want to use mnesia now, so I removed odbc by: {auth_method, internal}. %% {auth_method, odbc}. But when I close mysql service, and restart ejabberd , I found that there are connection error: E(<0.333.0>:ejabberd_odbc:542) : mysql_conn: post_start error connect_failed So how to removed odbc ? 回答1: I suspect the problem might be due to the fact ejabberd's configuration file is used to bootstrap the "real" configuration storage which uses

问题 I am trying to configure eJabberd on my server. I finished the installation. The following sequence of commands gives an unexpected output: $ ejabberd start $ ejabberd status In this sequence the ejabbed is started and we are able to access the web admin interface. But after running the ejabberd status its giving following output: Failed to create main carrier for temp_alloc /sbin/ejabberdctl: line 412: 9616 Aborted $EXEC_CMD "$ERL $NAME ${CONN_NAME} -noinput -hidden -pa $EJABBERD_EBIN_PATH

问题 Does anyone have a good way to escape html tags in erlang (as for CGI.escapeHtml in Ruby)? Thanks 回答1: Well, i would tell you to roll your own method using string and list processing But, i would also say that if you have yaws web server source, there is a method i have used and copied into my own libraries. yaws_api:url_encode(HtmlString) . See it here in action. 1> Html = "5 > 4 = true". "5 > 4 = true" 2> yaws_api:url_encode(Html). "5%20%3E%204%20%3D%20true" 3> I hope this is some how what

问题 I am trying to make images seems like moving. I clear the screen and put the images back on it, but the screen is flickering a lot. Is there a way to make it seems like moving without flicker that much? the "draw_asteroids" is called every 100 ms since I want the movement of the image to be as much as continuous as possible, plus i have many other elements that move on screen as well (the code is similar to the spaceship). my code: start-> Wx = wx:new(), Frame = wxFrame:new(Wx, -1, "Main Game

问题 i was working with anonymous functionss in erlang when a problem caught my attention. the function is defined as follows -module(qt). -export([ra/0]). ra = fun() -> 4 end. this however does not work -export(Ra/0]). Ra = fun() -> 4 end. and neither does this can anyone tell me why erlang exhibits this behaviour ? 回答1: An Erlang module cannot export variables, only functions. You can achieve something similar to exporting variables by exporting a function with zero arguments that simply returns