查找URL的下载大小(内容长度) [英] finding the download size of a URL (Content-Length)

问题描述

我正在寻找一些Objective-C代码来查询URL并提供下载大小，类似于此示例:

I'm looking for some objective-c code to query a URL and give the download size, similar to this example: Checking Download size before download

但是在Objective-c中，并且使用ASIHttp是可以的.

but in objective-c, and using ASIHttp is OK.

推荐答案

发起HTTP HEAD请求:

Initiate the HTTP HEAD request:

NSURL *url = [NSURL URLWithString:@"http://www.google.com/"];
NSMutableURLRequest *httpRequest = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:10];
[httpRequest setHTTPMethod:@"HEAD"];
NSURLConnection *urlConnection = [[NSURLConnection alloc] initWithRequest:httpRequest delegate:self];

执行委托:

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)aResponse {
   long long filesize = [aResponse expectedContentLength];
}

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