[Mono-dev] (no subject)

[Kornél Pál]

Using DirectorySeparatorChar to determine the platform is just as
undesirable as using different binaries on each platform.:)

Environment.OSVersion.Platform is for this purpose.

For a sample code see:
http://www.mono-project.com/FAQ:_Technical#How_to_detect_the_execution_platform_.3F

Kornél

----- Original Message -----
From: "Jonathan Pryor" <jonpryor at vt.edu>
To: "Sridhar Kulkarni" <sridharkulkarni at msn.com>
Cc: <mono-devel-list at lists.ximian.com>
Sent: Saturday, September 10, 2005 4:39 PM
Subject: Re: [Mono-dev] (no subject)


> On Thu, 2005-09-08 at 16:03 +0530, Sridhar Kulkarni wrote:
>> Hi,
>>
>> I am having GetPathName method call in my C# code. I am using the same
>> source file to compile both on windows and linux. This method calls some
>> WIN32 APIs within it. This function also has linux specific code. As
>> there
>> is no #ifdef directive is not available in C# how to go about this. I
>> tried
>> using
>>
>> #if __linux
>>
>> ...............
>> .....
>>
>> #else //for windows
>> ..........
>> .  .. .
>> #endif
>>
>> But this doesn't work. How to go about this.
>
> This will work, but __MonoCS__ is the only pre-set #define symbol, and
> this only indicates that `mcs' is being used to compile the code, *not*
> what platform you're running on (as it could be mcs on Win32 as easily
> as mcs on Linux).
>
> Consequently, for this approach to work you need to add a
> -define:__linux argument to mcs to compile your Linux-specific code, e.g
>
> $ mcs -define:__linux my-program.cs
>
> However, using #if is typically undesirable.  It is generally preferable
> to do a runtime platform check and change behavior at runtime, e.g.:
>
> class Foo {
> [DllImport ("win32-lib")]
> private static extern void Win32Call ();
>
> [DllImport ("linux-lib")]
> private static extern void LinuxCall ();
>
> public static void Call ()
> {
> if (System.IO.Path.DirectorySeparatorChar == '\\') {
> Win32Call ();
> }
> else {
> LinuxCall ();
> }
> }
> }
>
> If the unmanaged library export has the same name, it is preferable to
> use the Win32 library name and provide a dllmap for Mono:
>
> class Foo {
> [DllImport ("win32-lib")]
> private static extern void NativeCall ();
>
> public static void Call ()
> {
> NativeCall ();
> }
> }
>
> And then provide a ASSEMBLY-NAME.dll.config file with the contents:
>
> <configuration>
> <dllmap dll="win32-lib" target="linux-lib"/>
> </configuration>
>
> See also:
>
> http://www.mono-project.com/DllMap
> http://www.mono-project.com/Interop_with_Native_Libraries
> http://www.mono-project.com/FAQ:_Technical#How_to_detect_the_execution_platform_.3F
>
> - Jon
>
>
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>