Zhi-Wei Cai Zhi-Wei Cai - 3 months ago 41
Objective-C Question

Accessing temp directory in Swift

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)];
return tempDirectoryPath;

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



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.