_WIN64 is not defined in x64 project

Question

I'm using VS2008 and the project properties are set for (active) x64

and the weird thing is _WIN64 is not defined and WPARAM and LPARAM are still 32-bit.

Should I define _WIN64 manually?

If so, where should I put #define _WIN64? Preprocessor setting doesn't seem to work.

I'm quite certain it's compiled as x64 because in task manager the exe has no *32 postfix.

i've tested in vs2010. _WIN64 has been defined. Please check your project configuration. — oldmonk, Aug 13 '12 at 05:56

score 6 · Accepted Answer · answered Aug 13 '12 at 06:43

6

The thing is,

_WIN64 is already defined by compiler but the IDE couldn't recognize it. (seemed fixed in VS2010.)

The values of sizeof(WPARAM) and sizeof(LPARAM) are both 8 (not 4)

The IDE shows codes in *ifdef _WIN64* block in grey color as if they were inactive, which are not.

answered Aug 13 '12 at 06:43

Jeffrey Goines

1

I'm still seeing the IDE problem in VS2010 – Trevor Carothers Jul 24 '15 at 17:19
I can still see problem VS2019 _WIN64 not defined – user3664223 Apr 28 '21 at 17:33

score 2 · Answer 2 · answered Aug 13 '12 at 05:55

2

According to Microsoft, in VS2008 you should set it yourself in the preprocessor definitions - both for debug and release builds - take a look here.

answered Aug 13 '12 at 05:55

Lyubomir Vasilev

yeah I actually read the article and added _WIN64 but didn't work. Here is the command line: /Od /D "_WIN64" /D "_UNICODE" /D "UNICODE" /Gm /EHsc /RTC1 /MDd /Fo"x64\Debug\\" /Fd"x64\Debug\vc90.pdb" /W3 /nologo /c /Zi /TP /errorReport:prompt – Jeffrey Goines Aug 13 '12 at 06:05
Well, do you do a rebuild after setting that? I am not sure that VS does it automatically and I think it is required. – Lyubomir Vasilev Aug 13 '12 at 06:21

2 Answers2