正在读取下载的文件objective-c

Question

我正在尝试读取从服务器下载的文本文件。

-(void)downloadFile
{
NSURLRequest request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://myserver.com/website/file.txt"]];
AFURLConnectionOperation *operation =   [[AFHTTPRequestOperation alloc] initWithRequest:request];
NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"file.txt"];
operation.outputStream = [NSOutputStream outputStreamToFileAtPath:filePath append:NO];
[operation setCompletionBlock:^{
        NSLog(@"downloadComplete!");
        NSString *path;
        path = [[NSBundle mainBundle] pathForResource: @"file" ofType: @"txt"];
        NSString *data = [self readFile: path];
        NSLog(@"%@",data);
}];
[operation start];
}
-(NSString *)readFile:(NSString *)fileName
{
    NSLog(@"readFile");
    NSString *appFile = fileName;
    NSFileManager *fileManager=[NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:appFile])
    {
        NSError *error= NULL;
        NSString *resultData = [NSString stringWithContentsOfFile: appFile encoding: NSUTF8StringEncoding error: &error];
        if (error == NULL)
            return resultData;
    }
    return NULL;
}

它成功下载了文件，但我无法读取文件。返回null。可能我无法正确设置文件路径。我想从设备磁盘读取文件，而不是项目捆绑包。

Answer 1

更改

path = [[NSBundle mainBundle] pathForResource: @"file" ofType: @"txt"];

至

path = filePath;

Answer 2

我让你的东西工作了，我不知道你是否还需要

-(void)downloadFile
{
    CNMRouter *routext;
    routext = ((LDAppDelegate *)[UIApplication sharedApplication].delegate).router;
    [[[Singleton sharedClient]httpClient] setParameterEncoding:AFFormURLParameterEncoding];
    NSMutableURLRequest *request;
    if([routext postOrGet]){
        request = [[[Singleton sharedClient]httpClient]  requestWithMethod:@"GET"
                                                                      path:[routext getLoginURLPath:@"admin" andPassword:@"admin"]
                                                                parameters:nil];
    }else{
        request   = [[[Singleton sharedClient]httpClient]  requestWithMethod:@"POST"
                                                                        path:[routext getBackupUrl]
                                                                  parameters:[routext getBackupURLPath]];
    }

//    NSURLRequest request = [NSURLRequest requestWithURL:[NSURL URLWithString:@"http://myserver.com/website/file.txt"]];
    AFURLConnectionOperation *operation =   [[AFHTTPRequestOperation alloc] initWithRequest:request];

    [operation setCompletionBlock:^{
        NSLog(@"downloadComplete!");
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSLog(@"%@", [paths objectAtIndex:0]);
        NSString *filePath = [[paths objectAtIndex:0] stringByAppendingPathComponent:@"file.txt"];
//        operation.outputStream = [NSOutputStream outputStreamToFileAtPath:filePath append:NO];
        NSString *path;
//        path = [[NSBundle mainBundle] pathForResource: @"file" ofType: @"txt"];
        path = filePath;
        NSString *data = [self readFile: path];
        NSLog(@"%@",data);
    }];
    [operation start];
}

我把一些stuf从它的位置移走了，但基本上你在下载文件之前就试图得到它，所以我只是在successs块中放了一些东西。它对我有用，谢谢！