Cocoa：NSURLConnection未尝试HTTP请求 [英] Cocoa: NSURLConnection not attempting an HTTP Request

问题描述

我在NSURL，NSURL [Mutable]请求，NSURLConnection与我的iPhone应用程序取得了重大成功。当试图编译一个独立的Cocoa应用程序时，10行程序做出一个简单的HTTP请求，有零编译器错误或警告。该程序编译良好，但HTTP请求永远不会对我的Web服务器（我运行一个tcpdump，并观看Apache日志并行）。当我在iPhone应用中运行非常类似的代码，基本上复制/粘贴为邪恶，所有的作品都是金色的。

为了简单起见，我将代码中的obj声明保存在NSURLConnection的代理中。我也将以下内容传递给gcc：

gcc -o foo foo.m -lobjc -framework可可

感谢任何洞察。

  #import< Cocoa / Cocoa.h> 
 
 int main（int argc，char * argv []）
 {
 
 NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init]; 
 NSString * urlstr = @http：//tmp/test.php; 
 [NSApplication sharedApplication]; 
 NSObject * obj = [[NSObject alloc] init]; 
 NSURL * url = [NSURL URLWithString：urlstr]; 
 NSMutableURLRequest * request = [[NSMutableURLRequest alloc] initWithURL：url]; 
 
 if（[request isKindOfClass：[NSMutableURLRequest class]]）
 NSLog（@request is type of NSMutableURLRequest）; 
 
 
 [request setHTTPMethod：@GET]; 
 [request setCachePolicy：NSURLRequestReloadIgnoringLocalAndRemoteCacheData]; 
 NSURLConnection * connection = [[NSURLConnection alloc] 
 initWithRequest：request 
 delegate：obj 
 startImmediately：YES]; 
 
 if（connection）
 NSLog（@我们有一个连接。 
 
 [pool release]; 
 return 0; 
  

}

解决方案<

第一，你真的不需要这么做链接到Cocoa为此，只是链接到Foundation框架是好的。此外，由于您不需要连接到Window Server，您可以摆脱[NSApplication sharedApplicaiton]调用。如果你只是一个简单的，控制台测试应用程序开始，使用你现在和添加这个之前你的[pool realease]调用：

[[NSRunLoop currentRunLoop] run];

但请注意，这将阻止，实际上可能永远不会返回。在调用这个之前，你可以添加一个定时器，如果你想让你的代码实际上做一些事情在后台:)请参阅关于NSRunLoop的文档更多的使用方法。

I've had significant success with NSURL, NSURL[Mutable]Request, NSURLConnection with my iPhone applications. When trying to compile a stand alone Cocoa application, 10 line program to make a simple HTTP request, there are zero compiler errors or warnings. The program compiles fine, yet the HTTP Request is never made to my web server (I'm running a tcpdump and watching Apache logs in parallel). When I run very similar code in an iPhone app, essentially copy/pasted as evil as that is, all works golden.

I kept the code for the 'obj' declaration in the delegate to NSURLConnection out of this code snippet for the sake of simplicity. I'm also passing the following to gcc:

gcc -o foo foo.m -lobjc -framework cocoa

Thanks for any insight.

#import <Cocoa/Cocoa.h>

int main (int argc, char *argv[])
{    

NSAutoreleasePool * pool = [[NSAutoreleasePool alloc] init];
NSString * urlstr = @"http://tmp/test.php";
[NSApplication sharedApplication];
NSObject *obj = [[NSObject alloc] init];
NSURL *url = [NSURL URLWithString: urlstr];      
NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:url];

    if([request isKindOfClass:[NSMutableURLRequest class]])
    NSLog(@"request is of type NSMutableURLRequest");


[request setHTTPMethod:@"GET"];
[request setCachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData];
NSURLConnection *connection = [[NSURLConnection alloc]
                             initWithRequest:request
                     delegate:obj
                 startImmediately:YES];

if(connection) 
    NSLog(@"We do have a connection.");

[pool release];
return 0;

}

解决方案

The other poster pretty much answered this for you, but I thought I would just add a few things.

First, you don't really need to link to Cocoa for this, just linking to the Foundation framework is okay. Also, since you don't need a connection to the Window Server, you can get rid of the [NSApplication sharedApplicaiton] call. If you want just a simple, console test application to start with, use what you have now and add this before your [pool realease] call:

[[NSRunLoop currentRunLoop] run];

Please note, however, that this will block and may actually never return. Before calling this, you can add a timer if you want your code to actually do something in the background :) See the documentation on NSRunLoop for more ways to use this.

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