iOS5下的asiHttpRequest

Question

我成功地使用 AsiHttpRequest 库在我的应用程序中建立 url 连接。但是，我升级到 iOS5 并且 Reachability.m 文件在以下功能上报告了一些错误（4）：

static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) {

    #pragma unused (target, flags)
    NSCAssert(info, @"info was NULL in ReachabilityCallback");
    NSCAssert([(NSObject*) info isKindOfClass: [Reachability class]], @"info was the wrong class in ReachabilityCallback");


    // Post a notification to notify the client that the network reachability changed.
    [[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification object: (Reachability *) info];


} // ReachabilityCallback()


- (BOOL) startNotifier {

    SCNetworkReachabilityContext    context = {0, self, NULL, NULL, NULL};

    if(SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context)) {

        if(SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)) {

            return YES;

        }

    }

    return NO;

} // startNotifier

1sr 错误：在 NSCAssert 行中，“C 指针类型 'void' 到 Objective-C 指针类型 NSObject 的转换需要桥接转换”。为什么会发生以及如何解决？

回答：您可以为每个文件禁用 ARC。转到项目的构建设置并在所有 ASIHTTPRequest 文件上设置 -fno-objc-arc 标志（双击以编辑文本）。然后，您必须删除 ASIAuthenticationDialog 以及对它的任何仍然产生错误的引用。它对我有用。

Answer 1

编辑：我现在记得，是的，问题是 ARC。但是您可以通过在 Build Phases >> Compile Sources 中设置以下编译器标志来排除在 ARC 下编译的文件：-fno-objc-arc。如果您选择所有 ASIHTTPRequest 文件并双击，则可以一举为所有文件设置标志。

原帖：

我已经使用 ASIHTTPRequest 几个星期了，我记得在某处读过一篇关于可达性问题的帖子，我只是不记得它到底是什么。

无论如何，这就是我的 Reachability.m 中的那些行的样子：

//Start listening for reachability notifications on the current run loop
static void ReachabilityCallback(SCNetworkReachabilityRef target, SCNetworkReachabilityFlags flags, void* info) {

#pragma unused (target, flags)
NSCAssert(info, @"info was NULL in ReachabilityCallback");
NSCAssert([(NSObject*) info isKindOfClass: [Reachability class]], @"info was the wrong class in ReachabilityCallback");

//We're on the main RunLoop, so an NSAutoreleasePool is not necessary, but is added defensively
// in case someone uses the Reachablity object in a different thread.
NSAutoreleasePool* pool = [NSAutoreleasePool new];

// Post a notification to notify the client that the network reachability changed.
[[NSNotificationCenter defaultCenter] postNotificationName: kReachabilityChangedNotification 
                                                    object: (Reachability *) info];

[pool release];

} // ReachabilityCallback()


- (BOOL) startNotifier {

    SCNetworkReachabilityContext    context = {0, self, NULL, NULL, NULL};

    if(SCNetworkReachabilitySetCallback(reachabilityRef, ReachabilityCallback, &context)) {

        if(SCNetworkReachabilityScheduleWithRunLoop(reachabilityRef, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)) {

            return YES;

        }

    }

    return NO;

} // startNotifier