正在复制目标文件夹不存在的文件

Question

我正在编写一个应用程序来批量导入文件。我已经完成了大部分工作，但当目标文件夹不存在时，这个过程就会停止。

以下是代码的简化版本：

let fm = FileManager.default
do {
try fm.copyItem(atPath: "/…/source/file.ext",toPath: "/…/destination/NewFolder/file.ext")
}
catch let error as NSError {
print("Drat: (error)")
}

在这种情况下，需要创建NewFolder。如果我不这样做，我会收到一条消息，类似于：

Drat:Error Domain＝NSCocoaErrorDomain Code＝4〃；文件"file.ext"不存在"UserInfo=｛NSSourceFilePathErrorKey=/…/source/file.ext，NSUserStringVariant=(复制)，NSDestinationFilePath=/…/destination/NewFolder/file.ext，NSFilePath==/…source/file.ext，NSUnderlyingError=0x7fbaa9071270｛错误域=NSPOSIXErrorDomain代码=2"没有这样的文件或目录"｝｝

I认为这意味着目标文件夹不存在，尽管从消息中看并不明显。我发现，如果删除目标的NewFolder/部分，则文件复制成功。

如何快速创建丢失的目标文件夹。

我可以补充一点，作为大容量复制，将有多个丢失的目标文件夹要创建。

Answer 1

也许这太复杂或代码太多，但您尝试过这种方式吗？

/// This method copies the objects in the pathList from the given sourceURL to the targetURL. If the object in the pathList is a folder the existence is being checked by calling
/// checkExistenceOf(path: String, at sourcePath: String, in targetPath: String). If the object is not a directory, the object is copied from the source to the target. The delegate is expected to
/// handle the conflict options set by the user.
/// - Parameters:
///   - sourceURL: The source folder from where the objects are being copied.
///   - targetURL: The target folder to where the objects need to be copied.
///   - pathList: The objects that need to be copied.
private func copy(sourceURL: URL, to targetURL: URL, with pathList: [String]) {

for path in pathList {

let fullSourceURL = sourceURL.appendingPathComponent(path)
let reportPath = path
let reportSource = fullSourceURL.lastPathComponent.replacingOccurrences(of: "%20", with: " ")
let reportTarget = targetURL.path
if fullSourceURL.hasDirectoryPath {
//The path is a directory and we are checking the existence.
checkExistenceOf(path: path, at: sourceURL, in: targetURL)
} else {
//The path is a file and we are going to copy it.
let fullTargetURL = targetURL.appendingPathComponent(path)

do {
try mainFileManager.manager.copyItem(at: fullSourceURL, to: fullTargetURL)
} catch {
print(error.localizedDescription)
}
}
}
}

然后使用checkExistenceOf((方法，如下所示：

/// This method checks if a folder in the source location already exists in the target location. If the folder does not exist at the target, the folder is created by the method.
/// - Parameters:
///   - path: The folder that needs to be checked.
///   - sourcePath: The source location where the path already exists.
///   - targetPath: The target location where the existence of path is being chekced.
private func checkExistenceOf(path: String, at sourceURL: URL, in targetURL: URL) {

//The function fileExists can't deal with the %20 for space and the file:// for the source and target.
let sourcePath = sourceURL.relativePath
let targetPath = targetURL.relativePath
let fullSourcePath = String(sourcePath + "/" + path)
let fullTargetPath = String(targetPath + "/" + path)

//If the path doesn't exist create the folder at target with the same attributes as pth at source.
if !mainFileManager.manager.fileExists(atPath: fullTargetPath) {

let newDirectory = targetURL.appendingPathComponent(path)

do {
let attributes = try mainFileManager.manager.attributesOfItem(atPath: fullSourcePath)
try mainFileManager.manager.createDirectory(at: newDirectory, withIntermediateDirectories: false, attributes: attributes)

} catch {
print(error.localizedDescription)
}
}
}

代码来自以前的项目。我很抱歉没有擦洗它。