我正在尝试将 Objective-C 应用程序转换为 swift。我到达了需要通过 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，但这只是因为我有Apple 为帮助开发人员而制作的SimpleFTPSample项目。现在我几乎完成了两种语言之间的转换，但我被卡住了。
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")
}
}
使用的变量的种类是：
var isSending = Bool()
var networkStream: NSOutputStream! = NSOutputStream()
var fileStream: NSInputStream! = NSInputStream()
var buffer: CConstPointer<UInt8>
var bufferOffset = size_t()
var bufferLimit = size_t()
我被困住了if self.bufferOffset != self.bufferLimit。
显然&self.buffer[self.bufferOffset]是不正确的（没有成员名称下标），以及self.bufferLimit - self.bufferOffset（找不到接受提供的参数的重载'-'）
老实说，我什至不确定得到什么&self.buffer[self.bufferOffset]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任何想法，他将非常受欢迎！
您可以在此处找到 SimpleFTPSample 项目。
对不起，如果我的英语不完美。