How Can I Programmatically Determine a Process's Bitness (32-bit or 64-bit)?

Determining Process Bitness Programmatically

In software development, the ability to programmatically assess the bitness (32-bit or 64-bit) of a specific process is often essential. This knowledge enables developers to create applications that cater to the appropriate system architecture.

Current Process

To determine the bitness of the current process, C# provides a straightforward method:

if (IntPtr.Size == 4)
{
    // 32-bit
}
else if (IntPtr.Size == 8)
{
    // 64-bit
}

Other Processes

Determining the bitness of other processes is slightly more involved. One approach is to leverage the Process class's IsWin64Emulator() method:

foreach (var p in Process.GetProcesses())
{
    try
    {
        Console.WriteLine(p.ProcessName + " is " + (p.IsWin64Emulator() ? string.Empty : "not ") + "32-bit");
    }
    catch (Win32Exception ex)
    {
        if (ex.NativeErrorCode != 0x00000005)
        {
            throw;
        }
    }
}

This method checks if the process is running in the 64-bit Windows Emulator (WOW64). However, it is only available on Windows versions 5.1 and above.

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