From what I understand, an assembly specifically built for x86 and running in a 64-bit operating system can only load libraries built for x86 or a BadImageFormatException will be thrown. In a 64-bit OS, an assembly built for Any CPU or x64 will throw the same exception when trying to load an x86 library. So, … Read more
_WIN32 doesn’t mean what you think it does. It means “I am using the Windows API”. The 32 postfix was added back in the days of Windows NT 3.1 to make it distinct from the 16-bit API that was used in Windows version 3. This term has fallen out of favor because of the bitness … Read more
You can temporarily disable filesystem redirection around the call to Process.Start, the appropriate API’s to P/Invoke are Wow64DisableWow64FsRedirection and Wow64RevertWow64FsRedirection. Another option is to use %windir%\sysnative, which is available on Windows Vista and above.
Yes, a 32-bit architecture is limited to addressing a maximum of 4 gigabytes of memory. Depending on the operating system, this number can be cut down even further due to reserved address space. This limitation can be removed on certain 32-bit architectures via the use of PAE (Physical Address Extension), but it must be supported … Read more
In C and C++ you have these least requirements (i.e actual implementations can have larger magnitudes) signed char: -2^07+1 to +2^07-1 short: -2^15+1 to +2^15-1 int: -2^15+1 to +2^15-1 long: -2^31+1 to +2^31-1 long long: -2^63+1 to +2^63-1 Now, on particular implementations, you have a variety of bit ranges. The wikipedia article describes this nicely.
That line you see indicates how the python interpreter was built. Breaking it down: Python 2.7 — Python version (r27:82525, Jul 4 2010, 07:43:08) — The build date and revision from src trunk that was used to build this. [MSC v.1500 64 bit (AMD64)] — Compiled with MSVC compiler targeting 64-bit on win32 — All … Read more
Here’s a workaround for installing the 64-bit version of the Microsoft Access Database Engine 2010 redistributable on a system with a 32-bit MS Office version installed: Check the 64-bit registry key “HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Office\14.0\Common\FilesPaths” before installing the 64-bit version of the Microsoft Access Database Engine 2010 redistributable. If it does not contain the “mso.dll” registry value, then … Read more
The function to call is IsWow64Process or IsWow64Process2. It tells your 32-bit application if it is running on a 64 bit Windows. If the program is compiled for 64 bits, it will already know.
sys.platform will be win32 regardless of the bitness of the underlying Windows system, as you can see in PC/pyconfig.h (from the Python 2.6 source distribution): #if defined(MS_WIN64) /* maintain “win32” sys.platform for backward compatibility of Python code, the Win64 API should be close enough to the Win32 API to make this preferable */ # define … Read more
From TechNet article on 64-bit editions of Office 2010: If you have installed Office 2010 including Microsoft Outlook 2010, Outlook sets a registry key named Bitness of type REG_SZ on the computer on which it is installed. The Bitness registry key indicates whether the Outlook 2010 installation is 32-bit or 64-bit. This may be useful … Read more