Swift 实时 NSTask 输出到 NSTextView
Real time NSTask output to NSTextView with Swift
我正在使用 NSTask 运行 rsync,我希望状态显示在 window 内滚动视图的文本视图中。现在我有这个:
let pipe = NSPipe()
task2.standardOutput = pipe
task2.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output: String = NSString(data: data, encoding: NSASCIIStringEncoding)! as String
textView.string = output
这让我得到了一些关于传输的统计数据,但我想实时获得输出,就像我 运行 Xcode 中的应用程序打印出来的一样], 并将其放入文本视图中。有办法吗?
(有关 Swift 3/4 的更新,请参阅 。)
您可以使用通知从管道异步读取。
这是一个简单的例子,展示了它是如何工作的,希望
帮助您入门:
let task = NSTask()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = NSPipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.waitForDataInBackgroundAndNotify()
var obs1 : NSObjectProtocol!
obs1 = NSNotificationCenter.defaultCenter().addObserverForName(NSFileHandleDataAvailableNotification,
object: outHandle, queue: nil) { notification -> Void in
let data = outHandle.availableData
if data.length > 0 {
if let str = NSString(data: data, encoding: NSUTF8StringEncoding) {
print("got output: \(str)")
}
outHandle.waitForDataInBackgroundAndNotify()
} else {
print("EOF on stdout from process")
NSNotificationCenter.defaultCenter().removeObserver(obs1)
}
}
var obs2 : NSObjectProtocol!
obs2 = NSNotificationCenter.defaultCenter().addObserverForName(NSTaskDidTerminateNotification,
object: task, queue: nil) { notification -> Void in
print("terminated")
NSNotificationCenter.defaultCenter().removeObserver(obs2)
}
task.launch()
而不是 print("got output: \(str)")
您可以附加收到的
字符串到您的文本视图。
上面的代码假设一个运行循环是活动的(就是这种情况
在默认 Cocoa 应用程序中)。
从 macOS 10.7 开始,NSPipe
上还有 readabilityHandler
属性,您可以使用它来设置新数据可用时的回调:
let task = NSTask()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = NSPipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.readabilityHandler = { pipe in
if let line = String(data: pipe.availableData, encoding: NSUTF8StringEncoding) {
// Update your view with the new text here
print("New ouput: \(line)")
} else {
print("Error decoding data: \(pipe.availableData)")
}
}
task.launch()
我很惊讶没有人提到这个,因为它简单多了。
这是 Martin 上面针对最新版本 Swift 的回答的更新版本。
let task = Process()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = Pipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.waitForDataInBackgroundAndNotify()
var obs1 : NSObjectProtocol!
obs1 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSFileHandleDataAvailable,
object: outHandle, queue: nil) { notification -> Void in
let data = outHandle.availableData
if data.count > 0 {
if let str = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
print("got output: \(str)")
}
outHandle.waitForDataInBackgroundAndNotify()
} else {
print("EOF on stdout from process")
NotificationCenter.default.removeObserver(obs1)
}
}
var obs2 : NSObjectProtocol!
obs2 = NotificationCenter.default.addObserver(forName: Process.didTerminateNotification,
object: task, queue: nil) { notification -> Void in
print("terminated")
NotificationCenter.default.removeObserver(obs2)
}
task.launch()
我有一个答案,我认为它比基于可读性处理程序的通知方法更干净。在这里,在 Swift 5:
class ProcessViewController: NSViewController {
var executeCommandProcess: Process!
func executeProcess() {
DispatchQueue.global().async {
self.executeCommandProcess = Process()
let pipe = Pipe()
self.executeCommandProcess.standardOutput = pipe
self.executeCommandProcess.launchPath = ""
self.executeCommandProcess.arguments = []
var bigOutputString: String = ""
pipe.fileHandleForReading.readabilityHandler = { (fileHandle) -> Void in
let availableData = fileHandle.availableData
let newOutput = String.init(data: availableData, encoding: .utf8)
bigOutputString.append(newOutput!)
print("\(newOutput!)")
// Display the new output appropriately in a NSTextView for example
}
self.executeCommandProcess.launch()
self.executeCommandProcess.waitUntilExit()
DispatchQueue.main.async {
// End of the Process, give feedback to the user.
}
}
}
}
请注意,Process 必须是 属性,因为在上面的例子中,假设命令在后台执行,如果它是一个局部变量,process 将立即被释放。感谢您的关注。
我正在使用 NSTask 运行 rsync,我希望状态显示在 window 内滚动视图的文本视图中。现在我有这个:
let pipe = NSPipe()
task2.standardOutput = pipe
task2.launch()
let data = pipe.fileHandleForReading.readDataToEndOfFile()
let output: String = NSString(data: data, encoding: NSASCIIStringEncoding)! as String
textView.string = output
这让我得到了一些关于传输的统计数据,但我想实时获得输出,就像我 运行 Xcode 中的应用程序打印出来的一样], 并将其放入文本视图中。有办法吗?
(有关 Swift 3/4 的更新,请参阅
您可以使用通知从管道异步读取。 这是一个简单的例子,展示了它是如何工作的,希望 帮助您入门:
let task = NSTask()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = NSPipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.waitForDataInBackgroundAndNotify()
var obs1 : NSObjectProtocol!
obs1 = NSNotificationCenter.defaultCenter().addObserverForName(NSFileHandleDataAvailableNotification,
object: outHandle, queue: nil) { notification -> Void in
let data = outHandle.availableData
if data.length > 0 {
if let str = NSString(data: data, encoding: NSUTF8StringEncoding) {
print("got output: \(str)")
}
outHandle.waitForDataInBackgroundAndNotify()
} else {
print("EOF on stdout from process")
NSNotificationCenter.defaultCenter().removeObserver(obs1)
}
}
var obs2 : NSObjectProtocol!
obs2 = NSNotificationCenter.defaultCenter().addObserverForName(NSTaskDidTerminateNotification,
object: task, queue: nil) { notification -> Void in
print("terminated")
NSNotificationCenter.defaultCenter().removeObserver(obs2)
}
task.launch()
而不是 print("got output: \(str)")
您可以附加收到的
字符串到您的文本视图。
上面的代码假设一个运行循环是活动的(就是这种情况 在默认 Cocoa 应用程序中)。
从 macOS 10.7 开始,NSPipe
上还有 readabilityHandler
属性,您可以使用它来设置新数据可用时的回调:
let task = NSTask()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = NSPipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.readabilityHandler = { pipe in
if let line = String(data: pipe.availableData, encoding: NSUTF8StringEncoding) {
// Update your view with the new text here
print("New ouput: \(line)")
} else {
print("Error decoding data: \(pipe.availableData)")
}
}
task.launch()
我很惊讶没有人提到这个,因为它简单多了。
这是 Martin 上面针对最新版本 Swift 的回答的更新版本。
let task = Process()
task.launchPath = "/bin/sh"
task.arguments = ["-c", "echo 1 ; sleep 1 ; echo 2 ; sleep 1 ; echo 3 ; sleep 1 ; echo 4"]
let pipe = Pipe()
task.standardOutput = pipe
let outHandle = pipe.fileHandleForReading
outHandle.waitForDataInBackgroundAndNotify()
var obs1 : NSObjectProtocol!
obs1 = NotificationCenter.default.addObserver(forName: NSNotification.Name.NSFileHandleDataAvailable,
object: outHandle, queue: nil) { notification -> Void in
let data = outHandle.availableData
if data.count > 0 {
if let str = NSString(data: data, encoding: String.Encoding.utf8.rawValue) {
print("got output: \(str)")
}
outHandle.waitForDataInBackgroundAndNotify()
} else {
print("EOF on stdout from process")
NotificationCenter.default.removeObserver(obs1)
}
}
var obs2 : NSObjectProtocol!
obs2 = NotificationCenter.default.addObserver(forName: Process.didTerminateNotification,
object: task, queue: nil) { notification -> Void in
print("terminated")
NotificationCenter.default.removeObserver(obs2)
}
task.launch()
我有一个答案,我认为它比基于可读性处理程序的通知方法更干净。在这里,在 Swift 5:
class ProcessViewController: NSViewController {
var executeCommandProcess: Process!
func executeProcess() {
DispatchQueue.global().async {
self.executeCommandProcess = Process()
let pipe = Pipe()
self.executeCommandProcess.standardOutput = pipe
self.executeCommandProcess.launchPath = ""
self.executeCommandProcess.arguments = []
var bigOutputString: String = ""
pipe.fileHandleForReading.readabilityHandler = { (fileHandle) -> Void in
let availableData = fileHandle.availableData
let newOutput = String.init(data: availableData, encoding: .utf8)
bigOutputString.append(newOutput!)
print("\(newOutput!)")
// Display the new output appropriately in a NSTextView for example
}
self.executeCommandProcess.launch()
self.executeCommandProcess.waitUntilExit()
DispatchQueue.main.async {
// End of the Process, give feedback to the user.
}
}
}
}
请注意,Process 必须是 属性,因为在上面的例子中,假设命令在后台执行,如果它是一个局部变量,process 将立即被释放。感谢您的关注。