nsCOMPtr<nsIFile> profileDir(do_CreateInstance(NS_LOCAL_FILE_CONTRACTID)); rv = profileDir->InitWithPath(nsDependentCString("/home/adele"));
and got no matching function for call to `nsDerivedSafe<nsIFile>:: InitWithNativePath(nsDependentCString)'
You'd need nsILocalFile for that, not nsIFile.
Also, NS_LITERAL_CSTRING is preferred to nsDependentCString for literal strings; and InitWithPath takes a unicode string, so you'd need NS_LITERAL_STRING (note missing C).
However, as you're in C++, you have this nice helper method:
nsCOMPtr<nsILocalFile> result;
nsresult rv = NS_NewLocalFile(NS_LITERAL_STRING("/home/adele", PR_TRUE, getter_AddRefs(result));
if (NS_FAILED(rv)) {
// error handling
}
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