Objective C 接收数据并将其保存为 xml 文件，以便在没有互联网连接的情况下读取它

Question

我有这种方法可以从谷歌阅读器获取带有提要阅读器内容的 xml 文件。 我想在本地保存数据（我确定数据是一个xml文件）我该怎么办？？？ 我可以将数据存储在本地以便稍后在没有互联网连接的情况下读取吗？我该怎么办？谢谢

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)aResponse
{
    NSLog(@"------------------------------- connectionDidReceiveResponse");
    expectedResponseLength = [NSNumber numberWithFloat:[aResponse expectedContentLength]];
    URLresponse = aResponse;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{   
    NSLog(@"------------------------------- connectionDidReceiveData: %@", data);
    //float l = [responseData length];
    //[delegate GoogleReaderRequestReceiveBytes:l onTotal:[expectedResponseLength floatValue]];


    //TESTING
    NSString *string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
    NSLog(@"the  data %@",string);


    [self.responseData appendData:data];
}

编辑**

我使用此代码但不起作用

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)aResponse
{
    NSLog(@"------------------------------- connectionDidReceiveResponse");
    expectedResponseLength = [NSNumber numberWithFloat:[aResponse expectedContentLength]];
    URLresponse = aResponse;
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{   
    NSLog(@"------------------------------- connectionDidReceiveData: %@", data);
    //float l = [responseData length];
    //[delegate GoogleReaderRequestReceiveBytes:l onTotal:[expectedResponseLength floatValue]];


    //TESTING
    NSString *string = [[NSString alloc] initWithData:data encoding:NSASCIIStringEncoding];
    NSLog(@"the  data %@",string);
    NSString *path=@"Library/News";
    [data writeToFile:path atomically:YES];

    [self.responseData appendData:data];
}

- (void)connection:(NSURLConnection *)connection didSendBodyData:(NSInteger)bytesWritten totalBytesWritten:(NSInteger)totalBytesWritten totalBytesExpectedToWrite:(NSInteger)totalBytesExpectedToWrite;
{
    NSLog(@"------------------------------- connectionDidSendBodyData: %d", totalBytesWritten);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)theError
{
    NSLog(@"------------------------------- connectionDidFailWithError: %@", [theError localizedDescription]);

    self.responseData = nil;
    NSString *path=@"Library/News";
    NSData *data = [[NSData alloc] initWithContentsOfFile:path];
    [self.responseData appendData:data];

    [delegate GoogleReaderRequestDidFailWithError:theError];
}

Answer 1

您可以使用 writeToFile:atomically: 方法来存储 NSData 对象。

样本：

[data writeToFile:path atomically:YES];