从URL获取数据的问题

这是我写的代码

NSString *str = [NSString stringWithFormat:@"https://graph.facebook.com/me?access_token=CAADbwxRRgq8BANULcGGn3d4NPZB4LlP3tCL9YjYH3Nd0fD2XvgjG0qTECEmOsFhNhcu4NCdgYzQK3lYaATiedLRP4ZAIRgf8FBtDBYd22z5BrMabHlex12nZAbm8UfJTrPVRw5rjN8abi9"]; NSURL* url = [NSURL URLWithString:[str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSError* error = nil; NSData* data = [NSData dataWithContentsOfURL:url options:NSDataReadingUncached error:&error]; if (error) { NSLog(@"%@", [error localizedDescription]); } else { NSLog(@"Data has loaded successfully."); } 

我得到了错误

错误域= NSCocoaErrorDomain代码= 256“该操作无法完成（Cocoa错误256.）”UserInfo = 0x218446a0

 {NSURL=https://graph.facebook.com/me?access_token=CAADbwxRRgq8BANULcGGn3d4NPZB4LlP3tCL9YjYH3Nd0fD2XvgjG0qTECEmOsFhNhcu4NCdgYzQK3lYaATiedLRP4ZAIRgf8FBtDBYd22z5BrMabHlex12nZAbm8UfJTrPVRw5rjN8abi9ZBoVD1DYVZCo8hcZC0n2CnMyk3ryeCQntRpdZCc2e} 

Answer 1

这里是NSCocoaErrorDomain为什么发生的一个很好的解释。

NSData dataWithContentsOfURL：不返回浏览器中显示的URL的数据

阅读它，看看这个答案中的任何build议是否对你有用。

Answer 2

尝试：

 NSString *str = [NSString stringWithFormat:@"https://graph.facebook.com/me?access_token=CAADbwxRRgq8BANULcGGn3d4NPZB4LlP3tCL9YjYH3Nd0fD2XvgjG0qTECEmOsFhNhcu4NCdgYzQK3lYaATiedLRP4ZAIRgf8FBtDBYd22z5BrMabHlex12nZAbm8UfJTrPVRw5rjN8abi9"]; NSURL* url = [NSURL URLWithString:[str stringByReplacingPercentEscapesUsingEncoding:NSUTF8StringEncoding]]; NSError* error = nil; NSData* data = [NSURLConnection sendSynchronousRequest:[NSURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:30] returningResponse:nil error:&error]; if (error) { NSLog(@"%@", [error localizedDescription]); } else { NSLog(@"Data has loaded successfully."); } 

尽pipe如此，我不知道为什么你的其他请求失败。 错误代码256不是很具描述性。