Windows 64 bit or 32 bit preprocessor directives

Hi,

I want to connect to an SQL Server database using ADO with VC++.
In order to do that you need to import an external dll, like so:

#import "C:\\Program Files (x86)\\Common Files\\System\\ado\\msado15.dll"

What if the OS is not 64 bit? That would mean the (x86)-suffix would be incorrect.
Does anyone know how to work around this using certain preprocessor directives?

Something like this, maybe?:

#if 64bit
#import "C:\\Program Files (x86)\\Common Files\\System\\ado\\msado15.dll"
#else
#import "C:\\Program Files\\Common Files\\System\\ado\\msado15.dll"
#endif

Just remove the path and let the compiler find it on its own.
http://support.microsoft.com/kb/169496

gg

thnx

but in case you have an actual code path that depends on 64 vs 32bit...

_M_X64 is defined for 64bit builds
_M_IX86 is defined for 32bit builds (the actual value will depend on what processor you're targetting)
_WIN64 is defined for Win64 builds
_WIN32 is defined for Win32 builds

the above is for Visual C++. Other compiler will have different macro's.

>> the above is for Visual C++. Other compiler will have different macro's.
Indeed. Here is a good reference for several different compilers: http://sourceforge.net/p/predef/wiki/Home/

Those are generally for the target environment. There are no macro's for "what environment am I compiling on" in VC++, so it's best to let compiler options deal with import paths.

gg

#import <msado15.dll>

does not work and the following error is generated

'fatal error C1083: Cannot open type library file: 'msado15.dll': No such file or directory'

Quote:

---

Originally Posted by danielmofo

#import <msado15.dll>
does not work and the following error is generated
'fatal error C1083: Cannot open type library file: 'msado15.dll': No such file or directory'

---

Read about The #import Directive and how it searchs for type library files...

Ok, so do I need to add the following to Additional Include Directories to make it works for both 32 and 64 bit windows?

C:\Program Files (x86)\Common Files\System\ado
C:\Program Files\Common Files\System\ado

Will it also run on both 32 and 64 bit windows after compilation?

The #import directive will take care of the required headers (in fact it generates one, the .tlh), so you never need to add anything to Additional Include Directories.

Also when using angle-bracket-form?

http://msdn.microsoft.com/en-us/libr...v=vs.100).aspx
says it does