swift - 如何处理 Process.run 抛出的异常

Question

根据可用的API和Apple Documentation Process.run 方法可能会抛出异常。我想处理潜在的异常，但我找不到任何有关这些异常的文档。

如何找到相关文档并处理 Process.run 异常？

示例代码:

func runProcess(process: Process) {
    do {
        try process.run()
    } catch ??? {
        // I don't know what exceptions can I catch here
    } catch {
        // If I use catch-all case, then the `error` object contains only
        // `localizedDescription` which doesn't help in handling errors either
    }
}

Answer 1

实际上是从[NSTask - (BOOL)launchAndReturnError:(out NSError **_Nullable)error]桥接过来的，所以抛出的异常是NSError，所以可以从

func runProcess(process: Process) {
    do {
        try process.run()
    } catch let error as NSError {
        // process NSError.code (domain, etc)
    } catch {
       // do anything else
    }
}

如果它对特定代码感兴趣，可以通过 CocoaError 处理(那里有很多声明的常量)

/// Describes errors within the Cocoa error domain.
public struct CocoaError {

do {
    try process.run()
} catch CocoaError.fileNoSuchFile {
    print("Error: no such file exists")
}

相关文档如下:

Handling Cocoa Errors in Swift

CocoaError constants