Question

我正在尝试开发一个下载管理器。我现在可以从linkclick上的几乎任何地方下载文件。

在 - （BOOL）webView：（UIWebView *）webView shouldStartLoadWithRequest：（NSURLRequest *）请求navigationType：（UIWebViewNavigationType）navigationType 我检查url是否是一个像zipfile这样的二进制文件的url。比我设置nsurlconnection


    NSMutableURLRequest  *urlRequest = [NSMutableURLRequest requestWithURL:url
                                                               cachePolicy:NSURLRequestReloadIgnoringLocalCacheData 
                                                               timeoutInterval:20.0];
        [urlRequest setValue:@"User-Agent" forHTTPHeaderField:@"Mozilla/5.0 (Macintosh; U; Intel Mac OS X; en) AppleWebKit/418.9 (KHTML, like Gecko) Safari/419.3"];
        NSURLConnection *mainConnection = [NSURLConnection connectionWithRequest:urlRequest delegate:self];
        if (nil == mainConnection) {
            NSLog(@"Could not create the NSURLConnection object");
        }   


(void)connection:(NSURLConnection )connection didReceiveResponse:(NSURLResponse)response {
self.tabBarController.selectedIndex=1;
[receivedData setLength:0];
percent = 0;
localFilename = [[[url2 absoluteString] lastPathComponent] copy];
NSLog(localFilename);

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0] ;

NSString *appFile = [documentsDirectory stringByAppendingPathComponent:localFilename];

[[NSFileManager defaultManager] createFileAtPath:appFile contents:nil attributes:nil];
[downloadname setHidden:NO];
[downloadname setText:localFilename];
expectedBytes = [response expectedContentLength];
exp = [response expectedContentLength];
NSLog(@"content-length: %lli Bytes", expectedBytes);
file = [[NSFileHandle fileHandleForUpdatingAtPath:appFile] retain];
if (file)   {

[file seekToEndOfFile];


}
}
(void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
if (file)  { 
    [file seekToEndOfFile];
} 
[file writeData:data]; 
[receivedData appendData:data];
long long resourceLength = [receivedData length];

float res = [receivedData length];
percent = res/exp;
[progress setHidden:NO];
[progress setProgress:percent];
NSLog(@"Remaining: %lli KB", (expectedBytes-resourceLength)/1024);
[kbleft setHidden:NO];
[kbleft setText:[NSString stringWithFormat:@"%lli / %lli KB", expectedBytes/1024 ,(resourceLength)/1024]];
}

在connectiondidfinish加载中我关闭文件。除了像filedude.com之前有捕获程序的主机之外，几乎每个主机都能正常工作在uiwebview我可以浏览下载页面进入验证码并获取下载链接。当我点击它时，文件将在文件目录中创建，文件名和下载开始，但他没有得到任何数据。每个文件都有0kb和NSLog（@“content-length：％lli Bytes”，expectedBytes）;给出类似100-400字节的东西。

有人可以帮我解决这个问题吗？

亲切的问候

Answer 1

应检查响应是什么

NSLog(@"%@", [connection allHttpHeaderFields])

Answer 2

查看 ASIHttpRequest

http://allseeing-i.com/ASIHTTPRequest/

非常灵活可靠。只有你有真正独特的要求，最好自己编写。

Answer 3

您是否可能没有关注HTTP重定向？您是否尝试过捕获并查看实际收到的数据？

NSUrlconnection问题从一些文件主机接收数据

3 个答案: