Question

How to detect if a 32-bit or 64-bit architecture using Win32 API in C++

Answer 1

#include <windows.h>
#include <iostream>

bool Is64BitWindows() {
#if defined(_WIN64)
    // If the process is compiled for 64-bit, it's running on a 64-bit OS.
    return true;
#elif defined(_WIN32)
    // If the process is compiled for 32-bit, check if it's running under WOW64.
    
    // WoW64 is a subsystem of the Windows operating system capable of running - 
    // - 32-bit applications on 64-bit Windows.
    BOOL isWow64 = FALSE;
    if (IsWow64Process(GetCurrentProcess(), &isWow64)) {
        return isWow64;
    }
    else {
        // If the function fails, assume 32-bit OS.
        return false;
    }
#else
    // Unknown architecture.
    return false;
#endif
}

int main() {
    if (Is64BitWindows()) {
        std::cout << "The system is 64-bit." << std::endl;
    }
    else {
        std::cout << "The system is 32-bit." << std::endl;
    }
}



/*
run

The system is 64-bit.

*/

 

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