blocks|key|1203912|text|一般来说，你必须使用条件编译来做这件事。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1203913|也就是说，如果你使用的是boost::filesystem，你应该使用portable+generic+path+format，这样你就可以忘记这样的事情了。|offset|length|style|CODE|1203914|entityMap|0|LINK|mutability|MUTABLE|url|http://www.boost.org/doc/libs/1_43_0/libs/filesystem/doc/reference.html#Pathname-formats^0|0|C|H|Z|S|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|Q|8|@$D|R|E|S|F|G]]|9|@$D|T|E|U|1|V]]|A|$]]|$1|H|3|-4|5|6|7|W|8|@]|9|@]|A|$]]]|I|$J|$5|K|L|M|A|$N|O]]]]

Generally speaking, you'd have do do this with conditional compilation.

That said, if you're using <code>boost::filesystem</code> you should be using the <a href="http://www.boost.org/doc/libs/1_43_0/libs/filesystem/doc/reference.html#Pathname-formats" rel="noreferrer">portable generic path format</a> so that you can forget about things like this.

blocks|key|1203959|text|最常用的方法之一是使用pre-processor+directive。该链接用于C语言，但在C%2B%2B中的使用方式相同。公平地说，每个编译器和操作系统都可以有自己的指令集。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1203960|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/C_preprocessor^0|B|N|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

One of the most used methods to do this is with a <a href="http://en.wikipedia.org/wiki/C_preprocessor" rel="nofollow noreferrer">pre-processor directive</a>. The link is for C but they're used the same way in C++. Fair warning, each compiler &amp; OS can have their own set of directives.

blocks|key|1204015|text|使用：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1204016|#if+defined(WIN32)+%7C%7C+defined(_WIN32)+%7C%7C+defined(__WIN32)+&&+!defined(__CYGWIN__)
static+const+std::string+slash="\\";
#else
static+const+std::string+slash="/";
#endif|code-block|syntax|javascript|1204017|顺便说一句，你仍然可以在Windows上安全地使用这个斜杠"/“，因为windows完全理解这一点。因此，只要坚持使用"/“斜杠，就可以解决所有路径的问题，即使像OpenVMS这样的路径也是如此，其中foo:[bar.bee]test.ext可以表示为/foo/bar/bee/test.ext。|offset|length|style|CODE|1204018|entityMap^0|0|0|2S|L|3I|L|0^^$0|@$1|2|3|4|5|6|7|O|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|P|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|Q|8|@$I|R|J|S|K|L]|$I|T|J|U|K|L]]|9|@]|A|$]]|$1|M|3|-4|5|6|7|V|8|@]|9|@]|A|$]]]|N|$]]

Use:

<pre><code>#if defined(WIN32) || defined(_WIN32) || defined(__WIN32) &amp;&amp; !defined(__CYGWIN__)
static const std::string slash="\\";
#else
static const std::string slash="/";
#endif
</code></pre>

BTW, you can still safely use this slash "/" on Windows as windows understands this perfectly. So just sticking with "/" slash would solve problems for all OSes even like OpenVMS where path is <code>foo:[bar.bee]test.ext</code> can be represented as <code>/foo/bar/bee/test.ext</code>.

blocks|key|1204075|text|调查http://en.wikipedia.org/wiki/Uname|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1204076|如果你使用g%2B%2B作为你的编译器/GNU，那么你可以试试下面的代码。符合POSIX的环境支持以下内容：|1204077|#include+<stdio.h>
#include+<sys/utsname.h>
#include+<stdlib.h>

int+main()
{
++++struct+utsname+sysinfo;
++++if(uname(&sysinfo))+exit(9);
++++printf("os+name:+%25s\n",+sysinfo.sysname);
++++return+0;
}|code-block|syntax|javascript|1204078|entityMap|0|LINK|mutability|MUTABLE|url|http://en.wikipedia.org/wiki/Uname^0|2|Y|0|0|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|X|8|@]|9|@]|C|$I|J]]|$1|K|3|-4|5|6|7|Y|8|@]|9|@]|C|$]]]|L|$M|$5|N|O|P|C|$Q|R]]]]

Look into <a href="http://en.wikipedia.org/wiki/Uname" rel="nofollow noreferrer">http://en.wikipedia.org/wiki/Uname</a>

If you are using g++ as your compiler/GNU then you could try the code below. POSIX compliant environments support this: 

<pre><code>#include &lt;stdio.h&gt;
#include &lt;sys/utsname.h&gt;
#include &lt;stdlib.h&gt;

int main()
{
 struct utsname sysinfo;
 if(uname(&amp;sysinfo)) exit(9);
 printf("os name: %s\n", sysinfo.sysname);
 return 0;
}
</code></pre>

blocks|key|1204132|text|默认情况下，Visual+Studio+#define的_WIN32位于预处理器项目设置中。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|1204133|所以你可以使用|1204134|//+_WIN32+=+we're+in+windows
#ifdef+_WIN32
//+Windows
#else
//+Not+windows
#endif|code-block|syntax|javascript|1204135|entityMap^0|K|7|S|6|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

By default, Visual Studio <code>#define</code>s <code>_WIN32</code> in the preprocessor project settings.

So you can use

<pre><code>// _WIN32 = we're in windows
#ifdef _WIN32
// Windows
#else
// Not windows
#endif
</code></pre>

blocks|key|1204195|text|predef.sourceforge.net是所有类型的宏的综合集合，用于标识编译器/操作系统等。(直接链接到操作系统子站点)|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1204196|entityMap|0|LINK|mutability|MUTABLE|url|http://sourceforge.net/p/predef/wiki/OperatingSystems/^0|0|M|0|0^^$0|@$1|2|3|4|5|6|7|L|8|@]|9|@$A|M|B|N|1|O]]|C|$]]|$1|D|3|-4|5|6|7|P|8|@]|9|@]|C|$]]]|E|$F|$5|G|H|I|C|$J|K]]]]

<a href="http://sourceforge.net/p/predef/wiki/OperatingSystems/" rel="nofollow">predef.sourceforge.net</a> is a comprehensive collection of all kinds of MACROs that identify compilers/operating systems and more. (linking directly to the operating system sub-site)

I am writing a cross-platform compatible function in C++ that creates directories based on input filenames. I need to know if the machine is Linux or windows and use the appropriate forward or back slash. For the following code below, if the machine is Linux then <code>isLinux = true</code>. How do I determine the OS? 

<pre><code>bool isLinux;
std::string slash;
std::string directoryName;

if isLinux
 slash = "/";
else
 slash = "\\";
end

boost::filesystem::create_directory (full_path.native_directory_string() + slash + directoryName); 
</code></pre>

Determine if Linux or Windows in C++

Visual Studio

编译器

Windows

Linux

我正在用C++编写一个跨平台兼容的函数，它根据输入文件名创建目录。我需要知道机器是Linux还是windows，并使用适当的正斜杠或反斜杠。对于下面的代码，如果机器是Linux，则使用isLinux = true。如何确定操作系统？bool isLinux;std::string slash;std::string d...

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