CODEWITHSUNDEEP
c++windowswinapi32bit-64bit
Johnny Pauling
Johnny Pauling

Reputation: 13387

How can I determine whether a process is 32 or 64 bit?

Given a Windows process handle, how can I determine, using C++ code, whether the process is 32 bit or 64 bit?

Upvotes: 14

Views: 17870

Answers (5)

Shashank
Shashank

Reputation: 124

If you do not want to use windows API, try:

int main()
{
    const int* pInt = nullptr;
    if (sizeof(pInt) == 8)
    {
        std::cout << "64 bit process";
    }
    else if(sizeof(pInt) == 4)
    {
        std::cout << "32 bit process";
    }
return 0;
}

Upvotes: -1

Андрей Петрашевич
Андрей Петрашевич

Reputation: 145

Try

#include <Windows.h>
enum class process_architecture
{
    nun,
    x32,
    x64
};
enum class windows_architecture
{
    x32,
    x64
};
windows_architecture process::get_windows_architecture()
{
#ifdef _WIN64
    return windows_architecture::x64;
#else
    return windows_architecture::x32;
#endif
}

process_architecture get_process_architecture(DWORD id)
{
    BOOL is_wow_64 = FALSE;
    HANDLE h_process = OpenProcess(PROCESS_QUERY_LIMITED_INFORMATION, false, id);
    if (!h_process) return process_architecture::nun;
    bool result = IsWow64Process(h_process, &is_wow_64);
    CloseHandle(h_process);
    if (!result) return process_architecture::nun;
    if (is_wow_64) return process_architecture::x32;
    else if (get_windows_architecture() == windows_architecture::x32) return process_architecture::x32;
    else return process_architecture::x64;
}

Upvotes: 0

Peter
Peter

Reputation: 1611

BOOL IsWow64(HANDLE process)
{
    BOOL bIsWow64 = FALSE;

    typedef BOOL(WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
    LPFN_ISWOW64PROCESS fnIsWow64Process;
    fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");

    if (NULL != fnIsWow64Process)
    {
        if (!fnIsWow64Process(process, &bIsWow64))
        {
            //handle error
        }
    }
    return bIsWow64;
}

bool IsX86Process(HANDLE process)
{
    SYSTEM_INFO systemInfo = { 0 };
    GetNativeSystemInfo(&systemInfo);

    // x86 environment
    if (systemInfo.wProcessorArchitecture == PROCESSOR_ARCHITECTURE_INTEL)
        return true;

    // Check if the process is an x86 process that is running on x64 environment.
    // IsWow64 returns true if the process is an x86 process
    return IsWow64(process);
}

Upvotes: 4

Remy Lebeau
Remy Lebeau

Reputation: 595402

If you have a process handle, use IsWow64Process().

If IsWow64Process() reports true, the process is 32-bit running on a 64-bit OS.

If IsWow64Process() reports false (or does not exist in kernel32.dll), then the process is either 32-bit running on a 32-bit OS, or is 64-bit running on a 64-bit OS. To know if the OS itself is 32-bit or 64-bit, use GetNativeSystemInfo() (or GetSystemInfo() if GetNativeSystemInfo() is not available in kernel32.dll).

Upvotes: 49

Sarfaraz Nawaz
Sarfaraz Nawaz

Reputation: 361252

If you have handle to the module then you can do this:

IMAGE_NT_HEADERS * headers = ImageNtHeader(handle);

if ( headers->FileHeader.Machine == IMAGE_FILE_MACHINE_I386 )
{
    //module is x86
}
else if  ( headers->FileHeader.Machine == IMAGE_FILE_MACHINE_AMD64 )
{
    //module is x64
}

I took help from my own answer.

Upvotes: 3

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