---
title: "CFURLCreateFromFileSystemRepresentationRelativeToBase(_:_:_:_:_:)"
framework: corefoundation
role: symbol
role_heading: Function
path: "corefoundation/cfurlcreatefromfilesystemrepresentationrelativetobase(_:_:_:_:_:)"
---

# CFURLCreateFromFileSystemRepresentationRelativeToBase(_:_:_:_:_:)

Creates a CFURL object from a native character string path relative to a base URL.

## Declaration

```swift
func CFURLCreateFromFileSystemRepresentationRelativeToBase(_ allocator: CFAllocator!, _ buffer: UnsafePointer<UInt8>!, _ bufLen: CFIndex, _ isDirectory: Bool, _ baseURL: CFURL!) -> CFURL!
```

## Parameters

- `allocator`: The allocator to use to allocate memory for the new CFURL object. Pass NULL or doc://com.apple.corefoundation/documentation/CoreFoundation/kCFAllocatorDefault to use the current default allocator.
- `buffer`: The character bytes to convert into a CFURL object. This should be the path as you would use in POSIX function calls.
- `bufLen`: The number of bytes in the buffer.
- `isDirectory`: A Boolean value that specifies whether the string is treated as a directory path when resolving against relative path components. Pass true if the pathname indicates a directory, false otherwise.
- `baseURL`: The URL against which to resolve the path.

## Return Value

Return Value A new CFURL object. Ownership follows the create rule. See The Create Rule.

## Discussion

Discussion This function takes a path name in the form of a native character string, resolves it against a base URL, and returns a new CFURL object containing the result.

## See Also

### Creating a CFURL

- [CFURLCopyAbsoluteURL(_:)](corefoundation/cfurlcopyabsoluteurl(_:).md)
- [CFURLCreateAbsoluteURLWithBytes(_:_:_:_:_:_:)](corefoundation/cfurlcreateabsoluteurlwithbytes(_:_:_:_:_:_:).md)
- [CFURLCreateByResolvingBookmarkData(_:_:_:_:_:_:_:)](corefoundation/cfurlcreatebyresolvingbookmarkdata(_:_:_:_:_:_:_:).md)
- [CFURLCreateCopyAppendingPathComponent(_:_:_:_:)](corefoundation/cfurlcreatecopyappendingpathcomponent(_:_:_:_:).md)
- [CFURLCreateCopyAppendingPathExtension(_:_:_:)](corefoundation/cfurlcreatecopyappendingpathextension(_:_:_:).md)
- [CFURLCreateCopyDeletingLastPathComponent(_:_:)](corefoundation/cfurlcreatecopydeletinglastpathcomponent(_:_:).md)
- [CFURLCreateCopyDeletingPathExtension(_:_:)](corefoundation/cfurlcreatecopydeletingpathextension(_:_:).md)
- [CFURLCreateFilePathURL(_:_:_:)](corefoundation/cfurlcreatefilepathurl(_:_:_:).md)
- [CFURLCreateFileReferenceURL(_:_:_:)](corefoundation/cfurlcreatefilereferenceurl(_:_:_:).md)
- [CFURLCreateFromFileSystemRepresentation(_:_:_:_:)](corefoundation/cfurlcreatefromfilesystemrepresentation(_:_:_:_:).md)
- [CFURLCreateFromFSRef(_:_:)](corefoundation/cfurlcreatefromfsref(_:_:).md)
- [CFURLCreateWithBytes(_:_:_:_:_:)](corefoundation/cfurlcreatewithbytes(_:_:_:_:_:).md)
- [CFURLCreateWithFileSystemPath(_:_:_:_:)](corefoundation/cfurlcreatewithfilesystempath(_:_:_:_:).md)
- [CFURLCreateWithFileSystemPathRelativeToBase(_:_:_:_:_:)](corefoundation/cfurlcreatewithfilesystempathrelativetobase(_:_:_:_:_:).md)
- [CFURLCreateWithString(_:_:_:)](corefoundation/cfurlcreatewithstring(_:_:_:).md)