12-23-2008, 12:16 AM

Hi All

I have a snippet of code which works in 10.4 but it supported in 10.3.

Hence i want some APIs to determine the OS , so that the snippet gets executed in the proper OS.

Also, please let me know if u have any better way to distinguish between the versions programmatically.

12-23-2008, 02:18 AM

I have got this from help :-

NSString *str = [[NSProcessInfo processInfo] operatingSystemVersionString];

But i am not able to use it properly.

12-23-2008, 06:17 AM

I am working with C++ source code

12-23-2008, 10:29 AM

Originally Posted by roublesaha

I have got this from help :-

NSString *str = [[NSProcessInfo processInfo] operatingSystemVersionString];

But i am not able to use it properly.

I am working with C++ source code

That's because you can't utilize the Cocoa frameworks directly from C++.

There are a few ways to approach this; which one is best depends upon the specifics of your needs. Since you haven't provided any details about why you are trying to do this in C++, I'll take a wild guess that yours is a cross-platform app that doesn't depend upon a GUI front end but which does need OS version information for some reason.

You can access Cocoa framework classes from an Objective-C++ file (i.e., a C++ file with the extension ".mm"). Assuming that redefining the top level of your C++ application as an Objective-C++ file is not an option (which it wouldn't be for a cross-platform app), one approach would be to create a separate Objective-C++ file to do the work, as in the following (very rough) example code:

main.cpp:

#include "MyCocoaBridge.h";

int main (int argc, char * const argv[])
{
    getVersion();
    return 0;
}

---------------------------------

MyCocoaBridge.h:

void getVersion(void);

---------------------------------

MyCocoaBridge.mm:

#import <Foundation/Foundation.h>
#include <iostream>

void getVersion(void)
{
    NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
    NSString *version = [[NSProcessInfo processInfo] operatingSystemVersionString];
    std::cout << [version UTF8String] << "\n";
    [pool drain];
    return;
}

In a cross-platform app you would of course also have to work out your projects and calls in such a way to replace the .mm file with something else in builds for non-Cocoa environments. And don't forget to add the Foundation framework to your Xcode project.

I hope this helps to put you on a workable track.

12-24-2008, 03:45 AM

I have tried your method...but it is giving errors :

I am using a empty project and included al the frameworks manually.
----------------------------------------------------------------------

main.cpp:

#include "MyCocoaBridge.h";

int main (int argc, char * const argv[])
{
// codes using disk arbitrartion framework(disk locking -unlocking)
getVersion();
return 0;
}

---------------------------------

MyCocoaBridge.h:

void getVersion(void);

---------------------------------

MyCocoaBridge.mm:

#import <Foundation/Foundation.h>
#include <iostream>

void getVersion(void)
{
NSAutoreleasePool *pool = [[NSAutoreleasePool alloc] init];
NSString *version = [[NSProcessInfo processInfo] operatingSystemVersionString];
std::cout << [version UTF8String] << "\n";
[pool drain];
return;
}
----------------------------------------------------------------
I have included the foundation framework but it is not able to identify it.....

It is showing the following errors :

/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:60: error: expected unqualified-id before '@' token
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:62: error: expected constructor, destructor, or type conversion before '*' token
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:63: error: 'NSString' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:63: error: 'aSelectorName' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:64: error: 'NSString' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:64: error: 'aClassName' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:65: error: expected constructor, destructor, or type conversion before '*' token
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:68: error: variable or field 'NSLog' declared void
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:68: error: 'NSString' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:68: error: 'format' was not declared in this scope
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:68: error: expected primary-expression before '...' token
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:68: error: initializer expression list treated as compound expression
/Developer/SDKs/MacOSX10.4u.sdk/System/Library/Frameworks/Foundation.framework/Headers/NSObjCRuntime.h:69: error: variable or field 'NSLogv' declared void

and many more errors of this sort.


I fail to understand why it is not able to identify Founadation framework whereas it is happy to be with disk arbitrartion framework.

12-24-2008, 06:23 AM

Hi
I have done some modifications in the settings and it is working wonders.

But tell me one thing....how should i return the value of the string in the cpp file.I mean what variable should i use to store the value returned by the function.

12-24-2008, 06:34 AM

I'm glad you figured out the project settings. I'm running Xcode on 10.5, and perhaps should have asked you which version of Xcode you are running since you are on 10.4 - that might be why you had some additional headaches with the project settings.

NSString has a variety of functions for creating a C-style array of characters. Those should be easy enough to return and use in your C++ code.

12-24-2008, 07:33 AM

But can please u tell me how to do the following :

I want to compare the value returned by ( NSString *str = [[NSProcessInfo processInfo] operatingSystemVersionString] ) with 10.4

.If it is less than that execute one piece of code otherwise if it is greater then execute other piece of code.

12-26-2008, 04:01 AM

Thanks guys for the help................especially mystic_fm
it is working fine now.........

cheers