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	<title>CStruct:Examples:GetSystemInfo</title>
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  <div class="code"><pre><span class="c"># CStruct Examples</span>
require <span class="s"><span class="dl">'</span><span class="k">windows/system_info</span><span class="dl">'</span></span>
require <span class="s"><span class="dl">'</span><span class="k">win32struct</span><span class="dl">'</span></span>
include <span class="co">Windows</span>::<span class="co">SystemInfo</span>

<span class="c"># SYSTEM_INFO in VC6 's SDK</span>
<span class="c"># typedef struct _SYSTEM_INFO {</span>
<span class="c">#     union {</span>
<span class="c">#         DWORD dwOemId;          // Obsolete field...do not use</span>
<span class="c">#         struct {</span>
<span class="c">#             WORD wProcessorArchitecture;</span>
<span class="c">#             WORD wReserved;</span>
<span class="c">#         };</span>
<span class="c">#     };</span>
<span class="c">#     DWORD dwPageSize;</span>
<span class="c">#     LPVOID lpMinimumApplicationAddress;</span>
<span class="c">#     LPVOID lpMaximumApplicationAddress;</span>
<span class="c">#     DWORD dwActiveProcessorMask;</span>
<span class="c">#     DWORD dwNumberOfProcessors;</span>
<span class="c">#     DWORD dwProcessorType;</span>
<span class="c">#     DWORD dwAllocationGranularity;</span>
<span class="c">#     WORD wProcessorLevel;</span>
<span class="c">#     WORD wProcessorRevision;</span>
<span class="c"># } SYSTEM_INFO, *LPSYSTEM_INFO;</span>

<span class="c"># SYSTEM_INFO in Ruby</span>
<span class="r">class</span> <span class="cl">SYSTEM_INFO</span> &lt; <span class="co">Win32Struct</span>
    union<span class="sy">:u</span> <span class="r">do</span>
        <span class="co">DWORD</span><span class="sy">:dwOemId</span>
        struct<span class="sy">:x</span> <span class="r">do</span>
            <span class="co">WORD</span><span class="sy">:wProcessorArchitecture</span>
            <span class="co">WORD</span><span class="sy">:wReserved</span>        
        <span class="r">end</span>
    <span class="r">end</span>
    <span class="co">DWORD</span>  <span class="sy">:dwPageSize</span>
    <span class="co">LPVOID</span> <span class="sy">:lpMinimumApplicationAddress</span>
    <span class="co">LPVOID</span> <span class="sy">:lpMaximumApplicationAddress</span>
    <span class="co">DWORD</span>  <span class="sy">:dwActiveProcessorMask</span>
    <span class="co">DWORD</span>  <span class="sy">:dwNumberOfProcessors</span>
    <span class="co">DWORD</span>  <span class="sy">:dwProcessorType</span>
    <span class="co">DWORD</span>  <span class="sy">:dwAllocationGranularity</span>
    <span class="co">WORD</span>   <span class="sy">:wProcessorLevel</span>
    <span class="co">WORD</span>   <span class="sy">:wProcessorRevision</span>
<span class="r">end</span>

<span class="c"># call GetSystemInfo</span>
sys_info = <span class="co">SYSTEM_INFO</span>.new
GetSystemInfo(sys_info.__data__) <span class="c"># __data__ is an alias for method 'data'        </span>
        
<span class="c">#output</span>
puts <span class="s"><span class="dl">&quot;</span><span class="k">&lt;System Infomation&gt;</span><span class="dl">&quot;</span></span> 
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Processor Architecture:</span><span class="il"><span class="idl">#{</span>sys_info.u.x.wProcessorArchitecture<span class="idl">}</span></span><span class="dl">&quot;</span></span>        <span class="c"># 'u' and 'x' can not be omitted</span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Page Size:</span><span class="il"><span class="idl">#{</span>sys_info.dwPageSize<span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Minimum Application Address:0x</span><span class="il"><span class="idl">#{</span>sys_info.lpMinimumApplicationAddress.to_s <span class="i">16</span><span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Maximum Application Address:0x</span><span class="il"><span class="idl">#{</span>sys_info.lpMaximumApplicationAddress.to_s <span class="i">16</span><span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Active Processor Mask:</span><span class="il"><span class="idl">#{</span>sys_info.dwActiveProcessorMask<span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Number Of Processors:</span><span class="il"><span class="idl">#{</span>sys_info.dwNumberOfProcessors<span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Processor Type:</span><span class="il"><span class="idl">#{</span>sys_info.dwProcessorType<span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Allocation Granularity:0x</span><span class="il"><span class="idl">#{</span>sys_info.dwAllocationGranularity.to_s <span class="i">16</span><span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Processor Level:</span><span class="il"><span class="idl">#{</span>sys_info.wProcessorLevel<span class="idl">}</span></span><span class="dl">&quot;</span></span>
puts        <span class="s"><span class="dl">&quot;</span><span class="k">Processor Revision:</span><span class="il"><span class="idl">#{</span>sys_info.wProcessorRevision<span class="idl">}</span></span><span class="dl">&quot;</span></span>
        
        
        </pre></div>
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