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//===----------------------------------------------------------------------===//
//
// This source file is part of the Swift open source project
//
// Copyright (c) 2025 Apple Inc. and the Swift project authors
// Licensed under Apache License v2.0 with Runtime Library Exception
//
// See http://swift.org/LICENSE.txt for license information
// See http://swift.org/CONTRIBUTORS.txt for the list of Swift project authors
//
//===----------------------------------------------------------------------===//
#if os(Windows)
public import WinSDK
import Foundation
public struct Win32Error: Error, CustomStringConvertible {
public let error: DWORD
public init(_ error: DWORD) {
self.error = error
}
public var description: String {
let flags: DWORD = DWORD(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS)
var buffer: UnsafeMutablePointer<WCHAR>?
let length: DWORD = withUnsafeMutablePointer(to: &buffer) {
$0.withMemoryRebound(to: WCHAR.self, capacity: 2) {
FormatMessageW(flags, nil, error, 0, $0, 0, nil)
}
}
guard let buffer, length > 0 else {
return "Win32 Error Code \(error)"
}
defer { LocalFree(buffer) }
return String(decodingCString: buffer, as: UTF16.self).trimmingCharacters(in: .whitespacesAndNewlines)
}
}
#endif
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