Question

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.");
}

我收到了错误

错误域= NSCocoaErrorDomain代码= 256“操作不能完成。（可可错误256.）“UserInfo = 0x218446a0

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

Answer 1

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.");
}

虽然，我不知道为什么你的其他请求失败了。错误代码256不是很具描述性。

Answer 2

以下是对NSCocoaErrorDomain发生原因的一个很好的解释。

NSData dataWithContentsOfURL: not returning data for URL that shows in browser

阅读它，看看该答案中的任何建议是否对您有用。

从网址获取数据的问题

2 个答案: