Trying to get Game Center to work with SDL in iOS

SDL Development
1

Hi, I’ve read all the topics and searched and I can’t find a complete answer to this.
I know I have to set a callback with SDL_iPhoneSetAnimationCallback, this is fine.
I have already set my authentication code, no prob here.
What I’m having trouble with is presenting the viewController that I get from the authentication handler.

I’m trying to use this code I’ve seen posted here, but it doesn’t compile.

Code:

UIViewController * GetSDLViewController(SDL_Window * sdlWindow)
{
UIKit_GetWindowWMInfo
SDL_SysWMinfo systemWindowInfo; -> Problems with this struct!
SDL_VERSION(&systemWindowInfo.version);
if ( ! SDL_GetWindowWMInfo(sdlWindow, &systemWindowInfo))
{
// consider doing some kind of error handling here
NSLog(@“GetSDLViewController error”);
return nil;
}
UIWindow * appWindow = systemWindowInfo.info.uikit.window;
UIViewController * rootViewController = appWindow.rootViewController;
return rootViewController;
}

I’ve included SDL_syswm.h but compilation fails with “ARC forbids Objective-C objects in structs or unions”.
I’m not sure if Apple changed some settings in the compiler, and this is not accepted anymore.
My question is: how can I get the SDL view controller? I don’t want to change nothing from the SDL source files. I’ve already wasted hours trying to solve this…
Let me add that I’m new to Objective-C (and that sure ain’t helping me).
Thanks!

2

You can turn ARC (Automatic Reference Counting) off in your project
settings.

What are you trying to accomplish with this code?On Thu, Mar 6, 2014 at 4:48 AM, Limanima <jorge.raposo.lima at gmail.com>wrote:

Hi, I’ve read all the topics and searched and I can’t find a complete
answer to this.
I know I have to set a callback with SDL_iPhoneSetAnimationCallback, this
is fine.
I have already set my authentication code, no prob here.
What I’m having trouble with is presenting the viewController that I get
from the authentication handler.

I’m trying to use this code I’ve seen posted here, but it doesn’t compile.

Code:

UIViewController * GetSDLViewController(SDL_Window * sdlWindow)
{
UIKit_GetWindowWMInfo
SDL_SysWMinfo systemWindowInfo; -> Problems with this struct!
SDL_VERSION(&systemWindowInfo.version);
if ( ! SDL_GetWindowWMInfo(sdlWindow, &systemWindowInfo))
{
// consider doing some kind of error handling here
NSLog(@“GetSDLViewController error”);
return nil;
}
UIWindow * appWindow = systemWindowInfo.info.uikit.window;
UIViewController * rootViewController = appWindow.rootViewController;
return rootViewController;
}

I’ve included SDL_syswm.h but compilation fails with “ARC forbids
Objective-C objects in structs or unions”.
I’m not sure if Apple changed some settings in the compiler, and this is
not accepted anymore.
My question is: how can I get the SDL view controller? I don’t want to
change nothing from the SDL source files. I’ve already wasted hours trying
to solve this…
Let me add that I’m new to Objective-C (and that sure ain’t helping me).
Thanks!

SDL mailing list
SDL at lists.libsdl.org
http://lists.libsdl.org/listinfo.cgi/sdl-libsdl.org

–
Pallav Nawani
IronCode Gaming Private Limited
Website: http://www.ironcode.com
Twitter: http://twitter.com/Ironcode_Gaming
Facebook: http://www.facebook.com/Ironcode.Gaming
Mobile: 9997478768

3

AH! ARC is “Automatic Reference Counting”… In that case the error makes sense.

This is what I’m trying to do:
I want to display the authentication view.
Here is the code:

  • (void)authenticateLocalPlayer
    {
    if (!gameCenterAvailable)
    {
    NSLog(@“Game Center not available on device, can’t authenticate user.”);
    return;
    }

    GKLocalPlayer *localPlayer = [GKLocalPlayer localPlayer];

    if (localPlayer.authenticated != NO)
    {
    NSLog(@“Player already authenticated.”);
    return;
    }

    if (SYSTEM_VERSION_LESS_THAN(@“6.0”))
    {
    // ios 5.x and below
    [localPlayer authenticateWithCompletionHandler:nil];
    }
    else
    {
    // ios 6.0 and above
    [localPlayer setAuthenticateHandler:(^(UIViewController* viewcontroller, NSError *error)
    {
    if (!error && viewcontroller)
    {
    [?!?!sdlViewController?!?! presentViewController:viewcontroller animated:YES completion:nil];
    }
    })];
    }
    }

I need this “?!?!sdlViewController?!?!”.

4

Pallav Nawani wrote:

You can turn ARC (Automatic Reference Counting) off in your project settings.

One addition to this: ARC can also be turned off for individual files [via Xcode]. I’ve had luck moving an app’s SDL_SysWMinfo-using code into a separate file, one that doesn’t compile with ARC, then having the rest of the Objective C/C++ files use ARC (which most of Apple’s sample code uses, nowadays).

More details on turning off ARC on a per-file basis can be found at http://stackoverflow.com/questions/6646052/how-can-i-disable-arc-for-a-single-file-in-a-project

Cheers,
– David L.

5

DLudwig wrote:

Pallav Nawani wrote:

You can turn ARC (Automatic Reference Counting) off in your project settings.

One addition to this: ARC can also be turned off for individual files [via Xcode]. I’ve had luck moving an app’s SDL_SysWMinfo-using code into a separate file, one that doesn’t compile with ARC, then having the rest of the Objective C/C++ files use ARC (which most of Apple’s sample code uses, nowadays).

More details on turning off ARC on a per-file basis can be found at http://stackoverflow.com/questions/6646052/how-can-i-disable-arc-for-a-single-file-in-a-project

Cheers,
– David L.

It worked!
The game center window is popping up.
Thank’s everybody, consider this problem solved.