我想实现nsurlconnectiondatadelegate,因为我需要支持异步模式 - 在同步模式下会自动跟随重定向,而这并不是我想要的。
作为参考,我已经有了在使用urlRequest等同步模式下工作的代码。
问题是我无法让FPC/Lazarus编译我的代码。
...
代码片段
{$mode objfpc}
{$modeswitch objectivec1}
{$modeswitch objectivec2}
...
// We need to implement support for NSURLConnectionDelegate and NSURLConnectionDataDelegate
TmsMacRequestDelegate = objcclass(NSObject)
public
// this will set flag when done
procedure connectionDidFinishLoading(ANSUC: NSURLConnection); message onnectionDidFinishLoading:'; override;
// ... implement rest?
end;
...
requestDelegate := TmsMacRequestDelegate.alloc.init;
urlConnection := NSURLConnection.connectionWithRequest_delegate(urlRequest, requestDelegate);
// ... setup flag
urlConnection.start;
// ... wait here in loop checking flag set by "finish loading"
通过以上测试,初始测试结果似乎不太理想。我们到达了urlConnection.start,但永远不会调用connectionDidFinishLoading。我的理论是可能因为我们没有完全实现代理。然而,这样做会给我带来其他问题-以下是声明:
TmsMacRequestDelegate = objcclass(NSObject)
public
procedure connectionDidFinishLoading(ANSUC: NSURLConnection); message 'connectionDidFinishLoading:'; override;
procedure connection(ANSUC: NSURLConnection; didReceive: NSURLResponse); message 'connection::';
procedure connection(ANSUC: NSURLConnection; didReceive: NSData); message 'connection::';
procedure connection(ANSUC: NSURLConnection; didSendBodyData: Integer; totalBytesWritten: Integer; totalBytesExpectedToWrite: Integer); message 'connection::::';
procedure connection(ANSUC: NSURLConnection; willSend: NSURLRequest; redirectResponse: PNSURLResponse); message 'connection:::';
procedure connection(ANSUC: NSURLConnection; willCacheResponse: NSCachedURLResponse); message 'connection::';
end;
- 在一个函数中,我已经将NSURLResponse?翻译为指向NSURLResponse的指针…但不确定哪个是正确的?
- 编译器抱怨我必须在我的第一个函数上添加“override”(尽管NSObject中没有任何一个函数被实现),并给出以下信息:
错误:只能在Objective-C和Java中覆盖继承的方法,在NSURLConnectionDelegateCategory中定义了“override”(继承的方法)
- 如果像建议的那样添加“override”,我得到:
错误::219:1:错误:无效的符号重定义
错误:"-TmsMacRequestDeletegate connection::]":
错误:^