判断系统是否是64位的方法有很多。
对于C#来说，调用WMI是一种简单易行的方式。我们可以用Win32_Processor类里面的AddressWidth属性来表示系统的位宽。AddressWidth的值受CPU和操作系统的双重影响。
具体的值如下面的表格所示：
| 32bit OS | 64bit OS | |
| 32bit CPU | AddressWidth = 32 | N/A |
| 64bit CPU | AddressWidth = 32 | AddressWidth = 64 |
可以用下面的C#代码得到AddressWidth的值
(注意需添加引用System.Management）
public static string Detect3264()
{
ConnectionOptions oConn = new ConnectionOptions();
System.Management.ManagementScope oMs = new System.Management.ManagementScope("////localhost", oConn);
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select AddressWidth from Win32_Processor");
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
ManagementObjectCollection oReturnCollection = oSearcher.Get();
string addressWidth = null;
{
addressWidth = oReturn["AddressWidth"].ToString();
}
}
{
ConnectionOptions oConn = new ConnectionOptions();
System.Management.ManagementScope oMs = new System.Management.ManagementScope("////localhost", oConn);
System.Management.ObjectQuery oQuery = new System.Management.ObjectQuery("select AddressWidth from Win32_Processor");
ManagementObjectSearcher oSearcher = new ManagementObjectSearcher(oMs, oQuery);
ManagementObjectCollection oReturnCollection = oSearcher.Get();
string addressWidth = null;
foreach (ManagementObject oReturn in oReturnCollection)
{
addressWidth = oReturn["AddressWidth"].ToString();
}
return addressWidth;
}