ScreenCaptureKit 里面的 SCStreamOutput 没有被顺利触发，是那个步骤错了，求解惑

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这是一个创建于 384 天前的主题，其中的信息可能已经有所发展或是发生改变。

代码如下：

import SwiftUI import ScreenCaptureKit struct ContentView: View { @State private var showingScreenshotAlert = false @State private var screenshotRect = CGRect(x: 100, y: 100, width: 400, height: 300) // 示例区域 @State private var cc = "截图 1" var body: some View { VStack { Text("点击下方按钮进行截图") .padding() Button(action: takeScreenshot) { Text(cc) .padding() .background(Color.blue) .foregroundColor(.white) .cornerRadius(8) } } .alert(isPresented: $showingScreenshotAlert) { Alert(title: Text("截图完成"), message: Text("截图已保存至桌面"), dismissButton: .default(Text("确定"))) } } class MyStreamOutput: NSObject, SCStreamOutput { var onCaptureCompletion: (() -> Void)? // 闭包，用于通知截图完成 func stream(_ stream: SCStream, didOutputSampleBuffer sampleBuffer: CMSampleBuffer, of type: SCStreamOutputType) { // 每当捕获到新的样本帧时打印消息 print("Captured a new frame of type") onCaptureCompletion?()// 调用闭包通知截图完成 } } func takeScreenshot() { cc = "在截图 1..." showingScreenshotAlert = true SCShareableContent.getWithCompletionHandler { (content, error) in if let error = error { print("Error: \(error)") } else if let cOntent= content { print("Displays: \(content.displays)") print("Displays: \(content.displays[0])") print("Displays: \(content.displays[0].width)") print("Displays: \(content.displays[0].height)") print("Windows:\(content.windows[23])") print("Windows ID:\(content.windows[23].windowID)") print("Windows Count:\(content.windows.count)") // MARK: - 创建 // 创建一个过滤器以捕获整个屏幕 let filter1 = SCContentFilter(display: content.displays[0], excludingWindows: []) let config1 = SCStreamConfiguration() let stream1 = SCStream(filter: filter1, configuration: config1, delegate: nil) // 实例化我们的输出处理类 let streamOutput = MyStreamOutput() // 定义截图完成时的动作 streamOutput.OnCaptureCompletion= { DispatchQueue.main.async { cc = "截图完成了" print("-----------") } } // 添加输出 do { try stream1.addStreamOutput(streamOutput, type: .screen, sampleHandlerQueue: DispatchQueue.main) print("流输出已成功添加") } catch { print("添加流输出时出错: \(error)") } stream1.startCapture { error in if let error = error { print("Failed to start capture: \(error)") } else { print("Capture started successfully!") } } } } } }

SCStreamOutput

触发

错误

1 条回复

happydoze

2024-09-22 14:55:11 +08:00

那自己回答吧,不知道为什么，只有异步才成功。不知道是不是线程的问题。有知道答案的人分析一下么
贴一下成功的代码

```swift

func signIn4() {
Task {
do {
let cOntent= try await getShareableContent()
guard let display = content.displays.first else { return }
print(display)
let filter = SCContentFilter(display: display, excludingWindows: [])
let cOnfig= SCStreamConfiguration()
config.minimumFrameInterval = CMTime(value: 1, timescale: 10)
let stream = SCStream(filter: filter, configuration: config, delegate: nil)
let output = Output()
try stream.addStreamOutput(output, type: .screen, sampleHandlerQueue: nil)
try await stream.startCapture()
try await Task.sleep(nanoseconds: 200_000_000)
try await stream.stopCapture()
} catch {
print("Failed to retrieve capturable content or start stream: \(error.localizedDescription)")
}
}
}

func getShareableContent() async throws -> SCShareableContent {
return try await withCheckedThrowingContinuation { continuation in
SCShareableContent.getWithCompletionHandler { content, error in
if let error = error {
continuation.resume(throwing: error)
} else if let cOntent= content {
continuation.resume(returning: content)
}
}
}
}

```