我正在尝试将用户地址簿中的联系人流式传输到我们的服务器。将所有联系人一次拉入内存可能会崩溃或使设备无响应。我不想承担将所有联系人写入文件和上传文件的开销。我可以看到通过网络发送的数据，但看起来格式无效。服务器无法识别请求正文。

我正在从地址簿中读取联系人并将它们写入 NSOutputStream。此 NSOutputStream 通过此代码与 NSInputStream 共享一个缓冲区

Buffering NSOutputStream used as NSInputStream?

//
//  NSStream+BoundPairAdditions.m
//  WAControls
//
//

#import "NSStream+BoundPairAdditions.h"
#include <sys/socket.h>

static void CFStreamCreateBoundPairCompat(
                                          CFAllocatorRef      alloc,
                                          CFReadStreamRef *   readStreamPtr,
                                          CFWriteStreamRef *  writeStreamPtr,
                                          CFIndex             transferBufferSize
                                          )
// This is a drop-in replacement for CFStreamCreateBoundPair that is necessary because that
// code is broken on iOS versions prior to iOS 5.0 <rdar://problem/7027394> <rdar://problem/7027406>.
// This emulates a bound pair by creating a pair of UNIX domain sockets and wrapper each end in a
// CFSocketStream.  This won't give great performance, but it doesn't crash!
{
#pragma unused(transferBufferSize)
    int                 err;
    Boolean             success;
    CFReadStreamRef     readStream;
    CFWriteStreamRef    writeStream;
    int                 fds[2];
    
    assert(readStreamPtr != NULL);
    assert(writeStreamPtr != NULL);
    
    readStream = NULL;
    writeStream = NULL;
    
    // Create the UNIX domain socket pair.
    
    err = socketpair(AF_UNIX, SOCK_STREAM, 0, fds);
    if (err == 0) {
        CFStreamCreatePairWithSocket(alloc, fds[0], &readStream,  NULL);
        CFStreamCreatePairWithSocket(alloc, fds[1], NULL, &writeStream);
        
        // If we failed to create one of the streams, ignore them both.
        
        if ( (readStream == NULL) || (writeStream == NULL) ) {
            if (readStream != NULL) {
                CFRelease(readStream);
                readStream = NULL;
            }
            if (writeStream != NULL) {
                CFRelease(writeStream);
                writeStream = NULL;
            }
        }
        assert( (readStream == NULL) == (writeStream == NULL) );
        
        // Make sure that the sockets get closed (by us in the case of an error,
        // or by the stream if we managed to create them successfull).
        
        if (readStream == NULL) {
            err = close(fds[0]);
            assert(err == 0);
            err = close(fds[1]);
            assert(err == 0);
        } else {
            success = CFReadStreamSetProperty(readStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
            assert(success);
            success = CFWriteStreamSetProperty(writeStream, kCFStreamPropertyShouldCloseNativeSocket, kCFBooleanTrue);
            assert(success);
        }
    }
    
    *readStreamPtr = readStream;
    *writeStreamPtr = writeStream;
}

// A category on NSStream that provides a nice, Objective-C friendly way to create
// bound pairs of streams.

@implementation NSStream (BoundPairAdditions)

+ (void)createBoundInputStream:(NSInputStream **)inputStreamPtr outputStream:(NSOutputStream **)outputStreamPtr bufferSize:(NSUInteger)bufferSize
{
    CFReadStreamRef     readStream;
    CFWriteStreamRef    writeStream;
    
    assert( (inputStreamPtr != NULL) || (outputStreamPtr != NULL) );
    
    readStream = NULL;
    writeStream = NULL;
    
#if defined(__MAC_OS_X_VERSION_MIN_REQUIRED) && (__MAC_OS_X_VERSION_MIN_REQUIRED < 1070)
#error If you support Mac OS X prior to 10.7, you must re-enable CFStreamCreateBoundPairCompat.
#endif
#if defined(__IPHONE_OS_VERSION_MIN_REQUIRED) && (__IPHONE_OS_VERSION_MIN_REQUIRED < 50000)
#error If you support iOS prior to 5.0, you must re-enable CFStreamCreateBoundPairCompat.
#endif
    
    if (NO) {
        CFStreamCreateBoundPairCompat(
                                      NULL,
                                      ((inputStreamPtr  != nil) ? &readStream : NULL),
                                      ((outputStreamPtr != nil) ? &writeStream : NULL),
                                      (CFIndex) bufferSize
                                      );
    } else {
        CFStreamCreateBoundPair(
                                NULL,
                                ((inputStreamPtr  != nil) ? &readStream : NULL),
                                ((outputStreamPtr != nil) ? &writeStream : NULL), 
                                (CFIndex) bufferSize
                                );
    }
    
    if (inputStreamPtr != NULL) {
        *inputStreamPtr  = CFBridgingRelease(readStream);
    }
    if (outputStreamPtr != NULL) {
        *outputStreamPtr = CFBridgingRelease(writeStream);
    }
}

@end

在这里，我通过处理 NSOutputStream 委托(delegate)来构建请求主体。

- (void)stream:(NSStream *)stream handleEvent:(NSStreamEvent)eventCode {
    
    switch(eventCode) {
        case NSStreamEventHasSpaceAvailable: {
            
            if(self.contactIndex == 0 && [self.producerStream hasSpaceAvailable]) {
                 NSMutableData *data = [[NSMutableData alloc] init];
                [data appendData:[@"\r\n\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
                [data appendData:[@"{\"contacts\": [" dataUsingEncoding:NSUTF8StringEncoding]];
                [self.producerStream write:[data bytes] maxLength:[data length]];
            }
            
            while([self.producerStream hasSpaceAvailable] &&  self.contactIndex < [self.dataContactIDs count]) {
                NSMutableData *contactData = [[[self getNextContact] dataUsingEncoding:NSUTF8StringEncoding] mutableCopy];
                if(self.contactIndex < [self.dataContactIDs count]) {
                    [contactData appendData:[@"," dataUsingEncoding:NSUTF8StringEncoding]];
                }
                
                [self.producerStream write:[contactData bytes] maxLength:[contactData length]];
            }
            
            if(self.contactIndex == self.dataContactIDs.count) {
                 NSMutableData *data = [[NSMutableData alloc] init];
                [data appendData:[@"]}" dataUsingEncoding:NSUTF8StringEncoding]];
                [data appendData:[@"\r\n\r\n\r\n" dataUsingEncoding:NSUTF8StringEncoding]];
                [self.producerStream write:[data bytes] maxLength:[data length]];
               
                [stream close];
                [stream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
                stream = nil;
            }
        } break;
        case NSStreamEventHasBytesAvailable: {
        } break;
        case NSStreamEventErrorOccurred: {
        } break;
        case NSStreamEventEndEncountered: {
            [stream close];
            [stream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
            stream = nil;
        } break;
        default: {
        } break;
    }
}

我正在使用 AFNetworking 进行联网。我将请求主体流设置为 NSInputStream。

NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:url]];
[request setHTTPMethod:@"POST"];
[request setValue:@"application/json; charset=UTF-8" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBodyStream:inputStream];

AFHTTPRequestOperation *op = [[AFHTTPRequestOperation alloc] initWithRequest:request];
op.responseSerializer = [AFHTTPResponseSerializer serializer];

[op setUploadProgressBlock:^(NSUInteger bytesWritten, long long totalBytesWritten, long long totalBytesExpectedToWrite) {
    NSLog(@"PROGRESS %d %lld %lld", bytesWritten, totalBytesWritten, totalBytesExpectedToWrite);
}];

[op setCompletionBlockWithSuccess:^(AFHTTPRequestOperation *operation, id responseObject) {
    [self processResponse:responseObject success:success error:error log:log];
 } failure:^(AFHTTPRequestOperation *operation, NSError *e) {
     [self processError:e op:operation error:error log:log];
 }];


[[NSOperationQueue mainQueue] addOperation:op];

然后网络请求是这样的:(使用 Wireshark 捕获)

POST /upload?token=dd224bceb02929b36d35&agent=iPhone%20Simulator&v=1.0 HTTP/1.1
Host: localhost:6547
Transfer-Encoding: Chunked
Accept-Encoding: gzip, deflate
Content-Type: application/json; charset=UTF-8
Accept-Language: en-us
Connection: keep-alive
Accept: */*
User-Agent: MyApp/2.0 CFNetwork/672.0.8 Darwin/13.0.0

9BD



{"contacts": [(valid json array)]}



0

我不确定为什么请求正文中包含 9BD 和 0。我认为缓冲区的设置方式存在错误，我相信这会导致服务器忽略 http 正文，因为它无效。看起来我正在正确构建请求吗？有一个更好的方法吗？我正在使用 pyramid/python 来处理请求。服务器收到请求没问题，但是请求体是空的。

编辑

如果我不发送任何联系人，“9BD”就会消失。如果我更改联系人数据，“9BD”会更改为不同的字符。 “0”总是在底部。

编辑2

Jim 指出请求的格式有效。这意味着服务器没有正确处理流。请求可以正常访问服务器，服务器也可以正常回复。但是，我没有看到任何请求正文。服务器正在运行 Pyramid/python。在服务器上，request.body 是空的。

最佳答案

这个要求很好。您的请求已分 block :

Transfer-Encoding: Chunked

9BD 表示下一个 block 的长度。末尾的零表示没有更多的 block 。

参见 section 3.6.1 of RFC 2616了解详情。

您的问题可能是您的服务器不理解分 block 请求。

关于python - iOS分块上传，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/20107529/