blocks|key|229105|text|type|unstyled|depth|inlineStyleRanges|entityRanges|data|229106|从命令行执行以下命令：|ordered-list-item|229107|229108|perl+-MLWP::Simple+-e+1|229109|如果您没有从上述命令中获得任何输出，则说明该模块已安装；如果您收到一个错误，则说明该模块未安装|229110|以供安装使用|unordered-list-item|229111|229112|"LWP::Simple"'+-MCPAN+-e‘安装perl|229113|当perl遇到使用My::Module时，它会遍历包含目录名的内置@INC模块的元素。在每个目录中，它检查是否存在名为"My“子目录，以及在该子目录中是否存在名为"Module.pm”的文件。|229114|检查系统中安装了LWP::Simple模块的位置，并在代码的use+LWP::Simple语句上方的行下键入。|229115|++++use+lib+'/usr/local/module';
++++use+LWP::Simple;|code-block|syntax|javascript|229116|entityMap^0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|-4|4|5|6|Z|7|@]|8|@]|9|$]]|$1|A|3|B|4|C|6|10|7|@]|8|@]|9|$]]|$1|D|3|-4|4|5|6|11|7|@]|8|@]|9|$]]|$1|E|3|F|4|5|6|12|7|@]|8|@]|9|$]]|$1|G|3|H|4|5|6|13|7|@]|8|@]|9|$]]|$1|I|3|J|4|K|6|14|7|@]|8|@]|9|$]]|$1|L|3|-4|4|5|6|15|7|@]|8|@]|9|$]]|$1|M|3|N|4|5|6|16|7|@]|8|@]|9|$]]|$1|O|3|P|4|5|6|17|7|@]|8|@]|9|$]]|$1|Q|3|R|4|5|6|18|7|@]|8|@]|9|$]]|$1|S|3|T|4|U|6|19|7|@]|8|@]|9|$V|W]]|$1|X|3|-4|4|5|6|1A|7|@]|8|@]|9|$]]]|Y|$]]

<ol>
<li>Execute the following from the command line:

<pre><code>perl -MLWP::Simple -e 1
</code></pre>

If you don't get any output from the above command then the module is installed; if you get an error, it's not installed</li>
<li>to install use 

<pre><code>perl -MCPAN -e'install "LWP::Simple"'
</code></pre></li>
</ol>

When perl encounters use My::Module it goes over the elements of the built-in @INC module that contains directory names. In each directory it check if there is a subdirectory called "My" and if in that subdirectory there is a file called "Module.pm".

check where LWP::Simple module is installed on your system and type below line just above the use LWP::Simple statement of your code.

<pre><code> use lib '/usr/local/module';
 use LWP::Simple;
</code></pre>

blocks|key|2884877|text|你已经确定你没有它(在某个地方它可以是found).|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2884878|perl+-MCPAN+-e'install+"LWP::Simple"'|unordered-list-item|offset|length|style|CODE|2884879|
+|2884880|ordered-list-item|2884881|2884882|entityMap^0|0|0|11|0|0|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|Q|8|@$E|R|F|S|G|H]]|9|@]|A|$]]|$1|I|3|J|5|6|7|T|8|@]|9|@]|A|$]]|$1|K|3|-4|5|L|7|U|8|@]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]|$1|N|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|O|$]]

<ol>
<li>You're already determined that you don't have it (somewhere it can be found).</li>
<li><code>perl -MCPAN -e'install "LWP::Simple"'</code></li>
</ol>

blocks|key|3098804|text|请看一下Perldoc网页。这将告诉您哪些模块是标准Perl模块，哪些不是。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|3098805|您还可以使用Perl命令查看是否安装了perldoc模块，如果安装了，则查看其文档。|3098806|$+perldoc+LWP::Simple|code-block|syntax|javascript|3098807|(如果Perldoc不是作为命令执行，则执行ls+-l+/usr/bin/perl*。在Mac上，一些Perl命令没有打开execute位。要打开它，请执行sudo+chmod+a%2Bx+/usr/bin/perl)。|style|CODE|3098808|碰巧LWP::Simple不是标准的Perl模块，如果您没有它，就必须安装它。大多数人已经向您介绍过cpan。不幸的是，默认情况下，Mac没有安装所需的命令行开发工具。You'll+have+to+install+them。|3098809|安装完成后，您可以使用cpan命令安装LWP::Simple：|3098810|$+sudo+cpan+++#Run+cpan+and+configure+it.+It+takes+about+3+minutes
cpan>+install+LWP::Simple
cpan>+exit|3098811|entityMap|0|LINK|mutability|MUTABLE|url|http://perldoc.perl.com/|1|http://www.manpagez.com/man/1/perldoc/|2|http://www.mkyong.com/mac/how-to-install-gcc-compiler-on-mac-os-x/^0|4|7|0|0|J|7|1|0|0|M|K|26|S|0|2|B|1E|4|2C|R|2|0|B|4|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@$A|17|B|18|1|19]]|C|$]]|$1|D|3|E|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|F|3|G|5|H|7|1E|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|1F|8|@$A|1G|B|1H|M|N]|$A|1I|B|1J|M|N]]|9|@]|C|$]]|$1|O|3|P|5|6|7|1K|8|@$A|1L|B|1M|M|N]|$A|1N|B|1O|M|N]]|9|@$A|1P|B|1Q|1|1R]]|C|$]]|$1|Q|3|R|5|6|7|1S|8|@$A|1T|B|1U|M|N]]|9|@]|C|$]]|$1|S|3|T|5|H|7|1V|8|@]|9|@]|C|$I|J]]|$1|U|3|-4|5|6|7|1W|8|@]|9|@]|C|$]]]|V|$W|$5|X|Y|Z|C|$10|11]]|12|$5|X|Y|Z|C|$10|13]]|14|$5|X|Y|Z|C|$10|15]]]]

Take a look at the <a href="http://perldoc.perl.com" rel="nofollow">Perldoc</a> webpage. This will tell you which modules are standard Perl modules and which ones aren't.

You can also use the <a href="http://www.manpagez.com/man/1/perldoc/" rel="nofollow">perldoc</a> command to find out if a Perl module is installed, and if it is, its documentation.

<pre><code>$ perldoc LWP::Simple
</code></pre>

(If Perldoc doesn't execute as a command do <code>ls -l /usr/bin/perl*</code>. On Macs, some of the Perl commands don't have the execute bit turned on. To turn it on, do <code>sudo chmod a+x /usr/bin/perl</code>).

It just happens the <code>LWP::Simple</code> isn't a standard Perl module, and if you don't have it, you'll have to install it. Most people have already told you about <code>cpan</code>. Unfortunately, by default, the Mac doesn't have the needed command line development tools installed. <a href="http://www.mkyong.com/mac/how-to-install-gcc-compiler-on-mac-os-x/" rel="nofollow">You'll have to install them</a>.

Once they're installed, you can use the <code>cpan</code> command to install LWP::Simple:

<pre><code>$ sudo cpan #Run cpan and configure it. It takes about 3 minutes
cpan&gt; install LWP::Simple
cpan&gt; exit
</code></pre>

<blockquote>
 Possible Duplicate: 
 <a href="https://stackoverflow.com/questions/65865/whats-the-easiest-way-to-install-a-missing-perl-module">What&#39;s the easiest way to install a missing Perl module?</a> 
</blockquote>



I'm attempting to run <a href="http://code.google.com/p/scxml2dot/source/browse/trunk/scxml2dot.pl" rel="noreferrer">a Perl script</a> to convert SCXML to Graphviz DOT. I modified the first line of the script to:

<pre><code>#!/usr/bin/env perl
</code></pre>

and <code>chmod +x</code> the file. When I run it via <code>./scmxl2dot.pl</code> I see the following error output:

<blockquote>
 Can't locate LWP/Simple.pm in @INC (@INC contains: /opt/local/lib/perl5/site_perl/5.12.3/darwin-multi-2level /opt/local/lib/perl5/site_perl/5.12.3 /opt/local/lib/perl5/vendor_perl/5.12.3/darwin-multi-2level /opt/local/lib/perl5/vendor_perl/5.12.3 /opt/local/lib/perl5/5.12.3/darwin-multi-2level /opt/local/lib/perl5/5.12.3 /opt/local/lib/perl5/site_perl /opt/local/lib/perl5/vendor_perl .) at ./scmxml2dot.pl line 14. 
 BEGIN failed--compilation aborted at ./scmxml2dot.pl line 14.
</blockquote>

Line 14 of the file is <code>use LWP::Simple;</code>

How do I:

<ol>
<li>Find out if I have this thing (module?) installed, and/or</li>
<li>Get LWP::Simple and make it available to the script?</li>
</ol>

This is running under OS X 10.7.3 and Perl 5.12.3 (as seen in the error).

Can't locate LWP/Simple.pm in @INC

Perl

 可能重复：我正在尝试运行将SCXML转换为Graphviz DOT。我将脚本的第一行修改为：#!/usr/bin/env perl并对文件执行chmod +x操作。当我通过./scmxl2dot.pl运行它时，我看到以下错误输出：在@INC中找不到LWP/Simple.pm (@INC包含: /opt/local/l...

问在@INC中找不到LWP/Simple.pm
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