C#判断操作系统是32位还是64位的方法

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 OS64bit OS32bit CPUAddressWidth = 32N/A64bit CPUAddressWidth = 32AddressWidth = 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 Distinguish64or32System()
        {
            try
            {
                string addressWidth = String.Empty;
                ConnectionOptions mConnOption = new ConnectionOptions();
                ManagementScope mMs = new ManagementScope("////localhost", mConnOption);
                ObjectQuery mQuery = new ObjectQuery("select AddressWidth from Win32_Processor");
                ManagementObjectSearcher mSearcher = new ManagementObjectSearcher(mMs, mQuery);
                ManagementObjectCollection mObjectCollection = mSearcher.Get();
                foreach (ManagementObject mObject in mObjectCollection)
                {
                    addressWidth = mObject["AddressWidth"].ToString();
                }
                return addressWidth;
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.ToString());
                return String.Empty;
            }
        }
最近因为要根据系统的情况来决定安装那种驱动，所以需要判断下系统是32bit,还是64bit
方法一：主要是利用getSystemWow64Directory这个函数来判断！
typedef UINT (WINAPI* GETSYSTEMWOW64DIRECTORY)(LPTSTR, UINT); 
BOOL IsWow64(void) 
{ 
#ifdef _WIN64 
return FALSE; 
#else 
GETSYSTEMWOW64DIRECTORY getSystemWow64Directory; 
HMODULE hKernel32; 
TCHAR Wow64Directory[MAX_PATH]; 
hKernel32 = GetModuleHandle(TEXT("kernel32.dll")); 
if (hKernel32 == NULL) { 
// 
// This shouldn't happen, but if we can't get 
// kernel32's module handle then assume we are 
//on x86. We won't ever install 32-bit drivers 
// on 64-bit machines, we just want to catch it 
// up front to give users a better error message. 
// 
return FALSE; 
} 
getSystemWow64Directory = (GETSYSTEMWOW64DIRECTORY) 
GetProcAddress(hKernel32, "GetSystemWow64DirectoryW"); 
if (getSystemWow64Directory == NULL) { 
// 
// This most likely means we are running 
// on Windows 2000, which didn't have this API 
// and didn't have a 64-bit counterpart. 
// 
return FALSE; 
} 
if ((getSystemWow64Directory(Wow64Directory, 
sizeof(Wow64Directory)/sizeof(TCHAR)) == 0) && 
(GetLastError() == ERROR_CALL_NOT_IMPLEMENTED)) { 
return FALSE; 
} 
// 
// GetSystemWow64Directory succeeded 
// so we are on a 64-bit OS. 
// 
return TRUE; 
#endif 
}
方法二：主要是利用IsWow64Process
#include <windows.h> typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL); LPFN_ISWOW64PROCESS fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress( GetModuleHandle("kernel32"),"IsWow64Process"); BOOL IsWow64() { BOOL bIsWow64 = FALSE; if (NULL != fnIsWow64Process) { if (!fnIsWow64Process(GetCurrentProcess(),&bIsWow64)) { // handle error } } return bIsWow64; } 
//判断当前进程
C# code
if (IntPtr.Size == 8)
{
// 64bit
}
else if (IntPtr.Size == 4)
{
// 32bit
}
正确的方法应该是这样:
BOOL IsWow64() 
{ 
    typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL); 
    LPFN_ISWOW64PROCESS fnIsWow64Process; 
    BOOL bIsWow64 = FALSE; 
    fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress( GetModuleHandle("kernel32"),"IsWow64Process"); 
    if (NULL != fnIsWow64Process) 
    { 
        fnIsWow64Process(GetCurrentProcess(),&bIsWow64);
    } 
    return bIsWow64; 
} 
不是判断函数地址是否有效,而是判断输出型参数bIsWow64的值.