从c / c ++应用程序确定32位操作系统还是64位操作系统

Question

I have 32-bit application build on Microsoft visual studio, now I have to run this application on 64-bit Operating system & my requirement is based on OS (32-bit or 64-bit) I need to load a dll, I am just looking for a macro in Visual studio which tells me what the current operating system bitness (32-bit or 64-bit) on which I am running my application.

I found _WIN32 & _WIN64 macros in MSVS but it seems there is a bug in VS2008 & VS2010 they is no _WIN64 defined in them.

is there a way in Visual studio () that i can determine whether I am running my application on 64-bit OS or 32-bit OS (not 32-bit application or 64-bit application), to be more specific, I am looking for a macro not a function like IsWow64Process() ??

Answer 1

You can't possible have a preprocessor macro which tells you whether you are running on 32-bit or 64-bit Windows. The value of a preprocessor macro is defined at compile time. The same executable (compiled just once), can be run on both 32-bit and 64-bit Windows.

You will have to use a run-time function.

Note that this whole thing sounds like an XY problem; Microsoft goes to considerable lengths to avoid you needing to know what the OS is. I suggest asking another question with your real problem.