使用Swift的临时文件路径

tmlen 发表于 Dev

109

特伦

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，仅NSTemporaryDirectory()返回临时目录的路径。使用BSDmktemp函数需要一个可变的C字符串作为参数。

马丁·R

这是mkstemp()从Swift 3及更高版本中可以使用的一种方法。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：

// 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)))
}

本文收集自互联网，转载请注明来源。

如有侵权，请联系 [email protected] 删除。