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；以避免保持连接活动 WiFi/3G）执行传输操作 FTP 文件，但尽管没有任何类型的错误，但如果您使用 ftp 站点，您下载的文件已损坏：要解决此问题，只需添加睡眠 (3)！此功能（睡眠）必须在 [self.networkStream close] 之前执行；警告：如果我更改 ftp 站点，没有“sleep (3)”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;
}
}