标签:结构 short cep erro sys ntp api cpu public
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 OS | 64bit OS | |
32bit CPU | AddressWidth = 32 | N/A |
64bit CPU | AddressWidth = 32 | AddressWidth = 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 }
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。
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; //32Bit 4 case 8:break; //64Bit 5 default:break; //Other 6 }
或者
1 switch (Marshal.SizeOf(IntPtr.Zero)) 2 { 3 case 4:break; //32Bit 4 case 8:break; //64Bit 5 default:break; //Other 6 }
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_INFO 16 { 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 else 46 { 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。
标签:结构 short cep erro sys ntp api cpu public
原文地址:http://www.cnblogs.com/Bita/p/6034845.html