在Swift中访问temp目录 [英] Accessing temp directory in Swift

问题描述

我试图访问临时目录在Swift。在Objective-C中，我可以使用下面的代码：

   - （NSString *）tempDirectory {
 
 NSString * tempDirectoryTemplate = 
 [NSTemporaryDirectory（）stringByAppendingPathComponent：@XXXXX]; 
 const char * tempDirectoryTemplateCString = [tempDirectoryTemplate fileSystemRepresentation]; 
 char * tempDirectoryNameCString =（char *）malloc（strlen（tempDirectoryTemplateCString）+ 1）; 
 strcpy（tempDirectoryNameCString，tempDirectoryTemplateCString）; 
 char * result = mkdtemp（tempDirectoryNameCString）; 
 if（！result）{
 return nil; 
} 
 NSString * tempDirectoryPath = [[NSFileManager defaultManager] stringWithFileSystemRepresentation：tempDirectoryNameCString length：strlen（result）]; 
 free（tempDirectoryNameCString）; 
 return tempDirectoryPath; 
} 
  

但是，我有点困惑的类型转换和从目标-C to Swift，例如 const char * 或 CMutablePointer 。

解决方案

p>如下所示：

  func createTempDirectory（） - >串？ {
 let tempDirectoryTemplate = NSTemporaryDirectory（）。stringByAppendingPathComponent（XXXXX）
 
 let fileManager = NSFileManager.defaultManager（）
 
 var err：NSErrorPointer = nil 
 if fileManager.createDirectoryAtPath（tempDirectoryTemplate，withIntermediateDirectories：true，attributes：nil，error：err）{
 return tempDirectoryTemplate 
} else {
 return nil 
} 
 } 
  

它不回答你关于char *的问题，但它更干净...

NSFileManager参考此处。

还可以查看关于唯一名称的此SO问题。

I was trying to access temp directory in Swift. In Objective-C, I could use the following code to do so:

- (NSString *)tempDirectory {

    NSString *tempDirectoryTemplate =
    [NSTemporaryDirectory() stringByAppendingPathComponent:@"XXXXX"];
    const char *tempDirectoryTemplateCString = [tempDirectoryTemplate fileSystemRepresentation];
    char *tempDirectoryNameCString           = (char *)malloc(strlen(tempDirectoryTemplateCString) + 1);
    strcpy(tempDirectoryNameCString, tempDirectoryTemplateCString);
    char *result                             = mkdtemp(tempDirectoryNameCString);
    if (!result) {
        return nil;
    }
    NSString *tempDirectoryPath = [[NSFileManager defaultManager] stringWithFileSystemRepresentation:tempDirectoryNameCString length:strlen(result)];
    free(tempDirectoryNameCString);
    return tempDirectoryPath;
}

However, I'm a bit confuse about the type conversion and casting from Objective-C to Swift, such as const char * or CMutablePointer<CChar>. Is there any documents that I should look into?

Thanks.

解决方案

How about something like :

func createTempDirectory() -> String? {
    let tempDirectoryTemplate = NSTemporaryDirectory().stringByAppendingPathComponent("XXXXX")

    let fileManager = NSFileManager.defaultManager()

    var err: NSErrorPointer = nil
    if fileManager.createDirectoryAtPath(tempDirectoryTemplate, withIntermediateDirectories: true, attributes: nil, error: err) {
        return tempDirectoryTemplate
    } else {
        return nil
    }
}

It doesn't answer your question about char* but it's cleaner...

NSFileManager reference here.

Also check out this SO question regarding unique names.

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