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判断系统架构

调用WMI

  可以用Win32_Processor类里面的AddressWidth属性来表示系统的位宽,但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 OS64bit OS
32bit CPUAddressWidth = 32N/A
64bit CPUAddressWidth = 32AddressWidth = 64


  用下面的代码得到AddressWidth的值(注意需添加引用System.Management)

 1 public string Detect3264() 2 { 3     ManagementScope Ms = new ManagementScope("\\\\localhost", new ConnectionOptions()); 4     ObjectQuery Query = new ObjectQuery("select AddressWidth from Win32_Processor"); 5     ManagementObjectSearcher Searcher = new ManagementObjectSearcher(Ms, Query); 6     ManagementObjectCollection ReturnCollection = Searcher.Get(); 7     string addressWidth = null; 8     foreach (ManagementObject Return in ReturnCollection) 9     {10         addressWidth = Return["AddressWidth"].ToString();11     }12     return addressWidth;13 }

 

调用Environment

1 bool Is64Bit = Environment.Is64BitOperatingSystem;

  为true则表示是64位,如返回值为false则表示为32位。

 

利用IntPtr结构获取系统位宽

  这个方法也是最直接的方法,但是有条件限制,利用IntPtr结构的size属性来查看系统的位宽,程序需要采用any CPU的方式进行编辑。正常情况下int的位宽是4位,即是32位操作系统。

1 switch (IntPtr.Size)2 {3     case 4:break;   //32Bit4     case 8:break;   //64Bit5     default:break;  //Other6 }

  或者

1 switch (Marshal.SizeOf(IntPtr.Zero))2 {3     case 4:break;   //32Bit4     case 8:break;   //64Bit5     default:break;  //Other6 }

 

使用API

  64位Wnidows 里面有个叫Wow64 的模拟器技术,可以使32位的程序在64位Windows 上运行。 当你想在程序里面针对32b位/ 64位系统执行不同代码的时候, 需要判断操作系统是32位还是64位。 使用 Windows API函数 GetNativeSystemInfo 可以获得这个信息。(注意是GetNativeSystemInfo  函数从Windows XP 开始才有, 而 IsWow64Process  函数从 Windows XP with SP2 以及 Windows Server 2003 with SP1 开始才有。 )

  所以为了程序不出错,最好用GetSystemInfo或者两个API看情况调用(代码使用两个API,分类使用)

 1 public enum Platform 2 { 3     X86, 4     X64, 5     IA64, 6     Unknown 7 } 8      9 const ushort PROCESSOR_ARCHITECTURE_INTEL = 0;10 const ushort PROCESSOR_ARCHITECTURE_IA64 = 6;11 const ushort PROCESSOR_ARCHITECTURE_AMD64 = 9;12 const ushort PROCESSOR_ARCHITECTURE_UNKNOWN = 0xFFFF;13     14 [StructLayout(LayoutKind.Sequential)]15 internal struct SYSTEM_INFO16 {   17     public ushort wProcessorArchitecture;18     public ushort wReserved;19     public uint dwPageSize;20     public IntPtr lpMinimumApplicationAddress;21     public IntPtr lpMaximumApplicationAddress;22     public UIntPtr dwActiveProcessorMask;23     public uint dwNumberOfProcessors;24     public uint dwProcessorType;25     public uint dwAllocationGranularity;26     public ushort wProcessorLevel;27     public ushort wProcessorRevision;28 };29 30 [DllImport("kernel32.dll")]31 static extern void GetNativeSystemInfo(ref SYSTEM_INFO lpSystemInfo);32 33 [DllImport("kernel32.dll")]34 static extern void GetSystemInfo(ref SYSTEM_INFO lpSystemInfo);35     36 public Platform GetPlatform()37 {38     SYSTEM_INFO sysInfo = new SYSTEM_INFO();39     40     if(System.Environment.OSVersion.Version.Major > 5 ||41        (System.Environment.OSVersion.Version.Major == 5 && System.Environment.OSVersion.Version.Minor >= 1))42     {43         GetNativeSystemInfo(ref sysInfo);44     }45     else46     {47         GetSystemInfo(ref sysInfo);48     }49     50     switch(sysInfo.wProcessorArchitecture)51     {52         case PROCESSOR_ARCHITECTURE_IA64:53             return Platform.IA64;54 55         case PROCESSOR_ARCHITECTURE_AMD64:56             return Platform.X64;57             58         case PROCESSOR_ARCHITECTURE_INTEL:59             return Platform.X86;60             61         default:62             return Platform.Unknown;63     }64 }

  Windows API 还提供了 IsWow64Process 函数判断程序是不是运行在Wow64模拟器之上。

 1 [DllImport("kernel32.dll")] 2 static extern IntPtr GetCurrentProcess(); 3  4 [DllImport("kernel32.dll", SetLastError = true, CallingConvention = CallingConvention.Winapi)] 5 [return: MarshalAs(UnmanagedType.Bool)] 6 static extern bool IsWow64Process( 7     [In] IntPtr processHandle, 8     [Out, MarshalAs(UnmanagedType.Bool)] out bool wow64Process); 9 10 isWow64 = false;11 if ((System.Environment.OSVersion.Version.Major == 5 && System.Environment.OSVersion.Version.Minor >= 1) ||12     System.Environment.OSVersion.Version.Major > 5)13 {14     SafeProcessHandle processHandle = GetProcessHandle((uint)System.Diagnostics.Process.GetCurrentProcess().Id);15     //或者 SafeProcessHandle processHandle = GetProcessHandle(GetCurrentProcess());16     if (!NativeMethods.IsWow64Process(processHandle, out isWow64))17     {18         throw new Win32Exception(Marshal.GetLastWin32Error());19     }20 }

  还有GetProcAddress,在这里就不赘述了。

判断系统架构