objective-c - NSStream 不发送所有数据

Question

我的情况很奇怪: 我实际上使用了示例“SimpleFTPSample”([self.networkStream setProperty: (id) kCFBooleanFalse forKey: (NSString *) kCFStreamPropertyFTPAttemptPersistentConnection]; 类型的一些小变体；以避免保持连接有效 WiFi/3G)来执行传输操作 FTP 文件但是尽管没有任何类型的错误，如果您使用 ftp 站点，您下载的文件已损坏:要解决此问题，只需添加一个 sleep (3)!此功能( sleep )必须在 [self.networkStream close] 之​​前执行； 警告:如果我更改 ftp 站点，即使没有“ sleep (3)”也没有问题!

我什么都不懂...感谢任何类型的帮助

我附上我的示例代码。

- (void)_startSend
{
BOOL                success;
NSURL *             url;
CFWriteStreamRef        ftpStream;

assert(self.networkStream == nil);      // don't tap receive twice in a row!
assert(self.fileStream == nil);         // ditto
assert(self.filePath == nil);           // self.filePath rappresenta il percorso del file da inviare

self.attendere.hidden = FALSE;

// First get and check the URL.
defaults = [NSUserDefaults standardUserDefaults];

NSString * Cartella_ZIP = [[defaults objectForKey:kIndirizzoIpUploadKey] 
                            stringByAppendingString:self.Nome_File_da_Inviare];

url = [[iSalesAgentAppDelegate sharedAppDelegate] smartURLForString:Cartella_ZIP];
success = (url != nil);

// If the URL is bogus, let the user know.  Otherwise kick off the connection.

if ( ! success) {
    self.statuslabel.text = @"Indirizzo FTP non valido!";
} else {
    NSLog(@"nome file %@",self.Nome_File_da_Inviare);
    self.filePath = [self.Cartella_Lavoro stringByAppendingPathComponent:self.Nome_File_da_Inviare];
    assert(self.filePath != nil);

    self.fileStream = [NSInputStream inputStreamWithFileAtPath:self.filePath];
    assert(self.fileStream != nil);

    [self.fileStream open];

    // Open a CFFTPStream for the URL.
    ftpStream = CFWriteStreamCreateWithFTPURL(NULL, (__bridge CFURLRef) url);
    assert(ftpStream != NULL);

    self.networkStream = (__bridge NSOutputStream *) ftpStream;   
    success = [self.networkStream setProperty:[defaults objectForKey:kUsernameFtpKey] forKey:(id)kCFStreamPropertyFTPUserName];
    assert(success);
    success = [self.networkStream setProperty:[defaults objectForKey:kPasswordFtpKey] forKey:(id)kCFStreamPropertyFTPPassword];
    assert(success);

    [self.networkStream setProperty:(id)kCFBooleanFalse forKey:(NSString *)kCFStreamPropertyFTPAttemptPersistentConnection];

    self.networkStream.delegate = self;
    [self.networkStream scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];

    [self.networkStream open];

    CFRelease(ftpStream);

    [self _sendDidStart];        
   }
 }
- (void)_stopSendWithStatus:(NSString *)statusString {
if (self.networkStream != nil) {
    [self.networkStream removeFromRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode];
    self.networkStream.delegate = nil;
    [self.networkStream close];
    self.networkStream = nil;
}

if (self.fileStream != nil) {
    [self.fileStream close];
    self.fileStream = nil;
}
[self _sendDidStopWithStatus:statusString];
}

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
{
assert(aStream == self.networkStream);
NSString * stringa_byte_letti =nil;
NSString * stringa_filesize =nil;
NSNumber * number = nil; 

self.filesize = [[[NSFileManager defaultManager] attributesOfItemAtPath:self.filePath error:nil] fileSize];

NSNumberFormatter *numberFormatter = [[NSNumberFormatter alloc] init]; 
[numberFormatter setNumberStyle:kCFNumberFormatterDecimalStyle]; 
[numberFormatter setGroupingSeparator:@"."];     

switch (eventCode) {
    case NSStreamEventOpenCompleted: {
        // Added: Finally get filesize
        [self _updateStatus:@"Aperta Connessione"];
        filesize = 0; byte_scritti = 0;
    } break;
    case NSStreamEventHasBytesAvailable: {
        [self _stopSendWithStatus:@"Network write error"];
        assert(NO);     // should never happen for the output stream
    } break;
    case NSStreamEventHasSpaceAvailable: {
        [self _updateStatus:@"Invio Ordine..."];

        if (self.bufferOffset == self.bufferLimit) {
            NSInteger   bytesRead;
            bytesRead = [self.fileStream read:self.buffer maxLength:kSendBufferSize];

            if (bytesRead == -1) {
                [self _stopSendWithStatus:@"File read error"];
            } else if (bytesRead == 0) {
                sleep(3);
                [self _stopSendWithStatus:nil];
            } else {
                self.bufferOffset = 0;
                self.bufferLimit  = bytesRead;
            }
        }

        // If we're not out of data completely, send the next chunk.

        if (self.bufferOffset != self.bufferLimit) {
            NSInteger   bytesWritten;
            bytesWritten = [self.networkStream write:&self.buffer[self.bufferOffset] maxLength:self.bufferLimit - self.bufferOffset];
            assert(bytesWritten != 0);
            byte_scritti += bytesWritten;
            if (bytesWritten == -1) {
                [self _stopSendWithStatus:@"Network write error"];
            } else {
                self.bufferOffset += bytesWritten;
            }
        }

        number = [NSNumber numberWithDouble:byte_scritti]; 
        stringa_byte_letti = [numberFormatter stringForObjectValue:number]; 
        number = [NSNumber numberWithInteger:self.filesize]; 
        stringa_filesize = [numberFormatter stringForObjectValue:number]; 
        [self _updateStatus:[NSString stringWithFormat:@"Invio File nr. %i di %i: Totale byte %@ - byte scritti : %@", [self.numero_file_da_inviare intValue]+1 ,[Array_FileZip count],stringa_filesize,stringa_byte_letti ]];

        // Pull some data off the network.
        NSNumber * percentuale_progress = [NSNumber numberWithFloat: (float)byte_scritti / (float)self.filesize];
        [self performSelectorOnMainThread:@selector(Aggiorna_ProgressBar:) withObject:percentuale_progress waitUntilDone:YES];        

    } break;
    case NSStreamEventErrorOccurred: {
        [self _stopSendWithStatus:@"File Dati non trovato!"];
    } break;
    case NSStreamEventEndEncountered: {
        // evento ignorato
    } break;
    default: {
        [self _stopSendWithStatus:@"Network write error"];
        assert(NO);
    } break;
}   
}

Answer 1

同样的问题。据我了解，问题是当您在没有持久连接的情况下工作时，当您调用“关闭”时，与 FTP 服务器的连接会立即关闭(在有效传输最后一 block 数据之前)。问题是关闭不执行数据的“刷新”。我也被这个问题困扰了。