create new file failed

[Calvin Liu]

i used the following code:

        const char *s = currentFolderPath.GetNativePathCString();
        nsCAutoString str(s);
        nsCOMPtr<nsILocalFile> fn;
        rv = NS_NewNativeLocalFile(str, PR_FALSE, getter_AddRefs(fn));
        if (NS_FAILED(rv)) return rv;

even rv returns NS_OK, i can't find the file anywhere, why?

this code got the same result:
        nsString aFileName(currentFolderNameStr);
        nsCAutoString aFileName;
        aFileName.AssignWithConversion(str.get());
        nsCOMPtr<nsILocalFile> fn;
        rv = NS_NewNativeLocalFile(aFileName, PR_FALSE, getter_AddRefs(fn));
        if (NS_FAILED(rv)) return rv;

what's wrong?