使用swift的临时文件路径

本文介绍了使用swift的临时文件路径的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

如何在OS X上使用Swift/Cocoa获得唯一的临时文件路径? 可可似乎没有为此提供功能，只有NSTemporaryDirectory()可以返回临时目录的路径.使用BSD mktemp函数需要一个可变的C字符串作为参数.

How to get a unique temporary file path using Swift/Cocoa on OS X? Cocoa does not seem to provide a function for this, only NSTemporaryDirectory() which returns the path of the temporary directory. Using the BSD mktemp function requires a mutable C-string as argument.

推荐答案

以下是使用 Swift 3 及更高版本中的mkstemp()的一种可能方法. URL方法 用于在URL实例和代表文件系统路径的C字符串之间进行转换:

Here is a possible method to use mkstemp() from Swift 3 and later. URL methods are used to convert between URL instances and C strings representing the file system path:

// The template string: let template = URL(fileURLWithPath: NSTemporaryDirectory()).appendingPathComponent("file.XXXXXX") as NSURL // Fill buffer with a C string representing the local file system path. var buffer = [Int8](repeating: 0, count: Int(PATH_MAX)) template.getFileSystemRepresentation(&buffer, maxLength: buffer.count) // Create unique file name (and open file): let fd = mkstemp(&buffer) if fd != -1 { // Create URL from file system string: let url = URL(fileURLWithFileSystemRepresentation: buffer, isDirectory: false, relativeTo: nil) print(url.path) } else { print("Error: " + String(cString: strerror(errno))) }

Swift 2的旧代码

// The template string: let template = NSURL(fileURLWithPath: NSTemporaryDirectory()).URLByAppendingPathComponent("file.XXXXXX") // Fill buffer with a C string representing the local file system path. var buffer = [Int8](count: Int(PATH_MAX), repeatedValue: 0) template.getFileSystemRepresentation(&buffer, maxLength: buffer.count) // Create unique file name (and open file): let fd = mkstemp(&buffer) if fd != -1 { // Create URL from file system string: let url = NSURL(fileURLWithFileSystemRepresentation: buffer, isDirectory: false, relativeToURL: nil) print(url.path!) } else { print("Error: " + String(strerror(errno))) }