Swift 2无法调用' FSEventStreamCreate'具有类型的参数列表
问题描述：
使用 Swift 2 和 Xcode 7 beta 2(版本:7A121l)时，我使用 FSEventStream API 和 @convention(c) 收到此编译错误.
Using Swift 2 and Xcode 7 beta 2 (Build: 7A121l) I get this compile error using FSEventStream API and @convention(c).
任何建议都会很棒，谢谢！
Any advice would be awesome, thanks!
internal class FileSystem {
init () {
let allocator: CFAllocator? = kCFAllocatorDefault
// Create FSEventStream and return valid FSEventStreamRef
// Alias FSEventStreamCallback - CFunction
typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, UInt, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void
let callback: FSEventStreamCallback = {
(streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIds) -> Void in
print ("changed")
// handle file event
}
let context: UnsafeMutablePointer<FSEventStreamContext> = nil
let pathsToWatch: CFArray = [NSHomeDirectory() + "/Dir"]
let sinceWhen: FSEventStreamEventId = UInt64(kFSEventStreamEventIdSinceNow)
let latency: CFTimeInterval = 1.0
let flags: FSEventStreamCreateFlags = UInt32(kFSEventStreamCreateFlagNone)
let eventStream = FSEventStreamCreate(
allocator,
callback,
context,
pathsToWatch,
sinceWhen,
latency,
flags
)
FSEventStreamScheduleWithRunLoop(eventStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)
FSEventStreamStart(eventStream)
}
}
答
您使用了错误的签名(UInt不是Int):
You are using the wrong signature (UInt not Int):
typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, Int, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void
这可以很好地编译:
init () {
let allocator: CFAllocator? = kCFAllocatorDefault
// Create FSEventStream and return valid FSEventStreamRef
// Alias FSEventStreamCallback - CFunction
typealias FSEventStreamCallback = @convention(c) (ConstFSEventStreamRef, UnsafeMutablePointer<Void>, Int, UnsafeMutablePointer<Void>, UnsafePointer<FSEventStreamEventFlags>, UnsafePointer<FSEventStreamEventId>) -> Void
let callback: FSEventStreamCallback = {
(streamRef, clientCallBackInfo, numEvents, eventPaths, eventFlags, eventIds) -> Void in
print ("changed")
// handle file event
}
let context: UnsafeMutablePointer<FSEventStreamContext> = nil
let pathsToWatch: CFArray = [NSHomeDirectory() + "/Dir"]
let sinceWhen: FSEventStreamEventId = UInt64(kFSEventStreamEventIdSinceNow)
let latency: CFTimeInterval = 1.0
let flags: FSEventStreamCreateFlags = UInt32(kFSEventStreamCreateFlagNone)
let eventStream = FSEventStreamCreate(
allocator,
callback,
context,
pathsToWatch,
sinceWhen,
latency,
flags
)
FSEventStreamScheduleWithRunLoop(eventStream, CFRunLoopGetCurrent(), kCFRunLoopDefaultMode)
FSEventStreamStart(eventStream)
}