我正在尝试将 Objective-C 应用程序转换为 swift。 我正在到达需要通过 FTP 将文件发送到远程服务器的部分。我能够在 Objective-C 中做到这一点，但只是因为我有 SimpleFTPSample苹果为帮助开发人员而制作的项目。 现在我几乎完成了两种语言之间的转换，但我卡住了。

我需要转换该代码(来自 SimpleFTPSample+personal):

- (void)stream:(NSStream *)aStream handleEvent:(NSStreamEvent)eventCode
    // An NSStream delegate callback that's called when events happen on our 
    // network stream.
{
    #pragma unused(aStream)
    assert(aStream == self.networkStream);

    switch (eventCode) {
        case NSStreamEventOpenCompleted: {
            [self updateStatus:@"Opened connection"];
        } break;
        case NSStreamEventHasBytesAvailable: {
            assert(NO);     // should never happen for the output stream
        } break;
        case NSStreamEventHasSpaceAvailable: {
            [self updateStatus:@"Sending"];

            // If we don't have any data buffered, go read the next chunk of data.

            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) {
                    [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);
                if (bytesWritten == -1) {
                    [self stopSendWithStatus:@"Network write error"];
                } else {
                    self.bufferOffset += bytesWritten;
                }
            }
        } break;
        case NSStreamEventErrorOccurred: {
            [self stopSendWithStatus:@"Stream open error"];
        } break;
        case NSStreamEventEndEncountered: {
            // ignore
        } break;
        default: {
            assert(NO);
        } break;
    }
}

现在我设法做到了:

// An NSStream delegate callback that's called when events happen on our
// network stream.
func stream(theStream: NSStream!, handleEvent streamEvent: NSStreamEvent) {
    switch (streamEvent) {
    case NSStreamEvent.OpenCompleted:
        println("Opened connection")
    case NSStreamEvent.HasBytesAvailable:
        println("Not suposed to happend")
    case NSStreamEvent.HasSpaceAvailable:
        println("Sending")

        // If we don't have any data buffered, go read the next chunk of data.
        if self.bufferOffset == self.bufferLimit {
            var bytesRead: Int
            bytesRead = self.fileStream.read(self.buffer, maxLength: 32768)

            if bytesRead == -1 { self.stopSendWithStatus("File read error") }
            else if bytesRead == 0 { self.stopSendWithStatus(nil) }
            else {
                self.bufferOffset = 0
                self.bufferLimit  = size_t(bytesRead)
            }
        }

        // If we're not out of data completely, send the next chunk.
        if self.bufferOffset != self.bufferLimit {
            var bytesWritten: Int

            bytesWritten = self.networkStream.write(&self.buffer[self.bufferOffset], maxLength: self.bufferLimit - self.bufferOffset)

            if bytesWritten == -1 { self.stopSendWithStatus("Network write error") }
            else { self.bufferOffset += size_t(bytesWritten) }
        }
    case NSStreamEvent.ErrorOccurred:
        self.stopSendWithStatus("Stream open error")
    case NSStreamEvent.EndEncountered:
        println("ignore")
    default:
        println("default")
    }
}

使用的变量类型是:

var isSending = Bool()
var networkStream: NSOutputStream! = NSOutputStream()
var fileStream: NSInputStream! = NSInputStream()
var buffer: CConstPointer<UInt8>
var bufferOffset = size_t()
var bufferLimit = size_t()

我被 if self.bufferOffset != self.bufferLimit 部分困住了。

显然&self.buffer[self.bufferOffset]不正确(没有成员名下标)，还有self.bufferLimit - self.bufferOffset(找不到接受提供的参数的重载“-”)

老实说，我什至不确定 &self.buffer[self.bufferOffset] 的意思。 (不是变量而是符号。

因此，如果有人对如何解决这个问题有想法，我们将非常欢迎他!

您可以找到 SimpleFTPSample 项目 here .

对不起，如果我的英语不完美。

最佳答案

难道你不能把 SimpleFTP 编译成一个框架并直接从 swift 中使用它的方法吗？无需重写所有内容，Xcode 会为您完成。我将它用于许多自定义库，它就像一个魅力。只需添加目标，并放入所需的框架，包括框架，一切就绪!

关于objective-c - 在 swift 中实现 SimpleFTPSample，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/24071376/