---
title: "LSGetExtensionInfo(_:_:_:)"
framework: coreservices
role: symbol
role_heading: Function
path: coreservices/1446043-lsgetextensioninfo
---

# LSGetExtensionInfo(_:_:_:)

Obtains the starting index of the extension within a filename.

## Declaration

```swift
func LSGetExtensionInfo(_ inNameLen: Int, _ inNameBuffer: UnsafePointer<UniChar>!, _ outExtStartIndex: UnsafeMutablePointer<Int>!) -> OSStatus
```

## Parameters

- `inNameLen`: The number of characters in the filename specified by the inNameBuffer parameter.
- `inNameBuffer`: The buffer containing the filename’s Unicode characters.
- `outExtStartIndex`: A pointer to a value of type UniCharCount that, on return, will give the starting index of the extension within the filename. If the name does not contain a valid extension (one with no spaces in it), the value on return will be kLSInvalidExtensionIndex.

## Return Value

Return Value A result code; see Result Codes.

## Discussion

Discussion The starting index is the number of Unicode characters from the start of the filename buffer to the first character of the extension (not including the period). Version-Notes Thread-safe since Mac OS version 10.2.

## See Also

### Deprecated Functions

- [LSGetHandlerOptionsForContentType(_:)](coreservices/1445296-lsgethandleroptionsforcontenttyp.md)
- [LSSetHandlerOptionsForContentType(_:_:)](coreservices/1447588-lssethandleroptionsforcontenttyp.md)
- [LSCopyAllHandlersForURLScheme(_:)](coreservices/1443240-lscopyallhandlersforurlscheme.md)
- [LSCopyDefaultHandlerForURLScheme(_:)](coreservices/1441725-lscopydefaulthandlerforurlscheme.md)
- [LSGetApplicationForItem(_:_:_:_:)](coreservices/1446185-lsgetapplicationforitem.md)
- [LSGetApplicationForURL(_:_:_:_:)](coreservices/1445210-lsgetapplicationforurl.md)
- [LSGetApplicationForInfo(_:_:_:_:_:_:)](coreservices/1449928-lsgetapplicationforinfo.md)
- [LSCopyApplicationForMIMEType(_:_:_:)](coreservices/1448586-lscopyapplicationformimetype.md)
- [LSCanRefAcceptItem(_:_:_:_:_:)](coreservices/1442183-lscanrefacceptitem.md)
- [LSFindApplicationForInfo(_:_:_:_:_:)](coreservices/1449588-lsfindapplicationforinfo.md)
- [LSOpenApplication(_:_:)](coreservices/1447930-lsopenapplication.md)
- [LSOpenItemsWithRole(_:_:_:_:_:_:_:)](coreservices/1449783-lsopenitemswithrole.md)
- [LSOpenURLsWithRole(_:_:_:_:_:_:)](coreservices/1448184-lsopenurlswithrole.md)
- [LSOpenFSRef(_:_:)](coreservices/1445663-lsopenfsref.md)
- [LSOpenFromRefSpec(_:_:)](coreservices/1444466-lsopenfromrefspec.md)
- [LSCopyItemInfoForRef(_:_:_:)](coreservices/1445227-lscopyiteminfoforref.md)
- [LSCopyItemInfoForURL(_:_:_:)](coreservices/1445685-lscopyiteminfoforurl.md)
- [LSCopyDisplayNameForRef(_:_:)](coreservices/1442576-lscopydisplaynameforref.md)
- [LSCopyDisplayNameForURL(_:_:)](coreservices/1446850-lscopydisplaynameforurl.md)
- [LSCopyKindStringForRef(_:_:)](coreservices/1448593-lscopykindstringforref.md)
- [LSCopyKindStringForURL(_:_:)](coreservices/1447481-lscopykindstringforurl.md)
- [LSCopyKindStringForTypeInfo(_:_:_:_:)](coreservices/1446207-lscopykindstringfortypeinfo.md)
- [LSCopyKindStringForMIMEType(_:_:)](coreservices/1442446-lscopykindstringformimetype.md)
- [LSCopyItemAttribute(_:_:_:_:)](coreservices/1445023-lscopyitemattribute.md)
- [LSCopyItemAttributes(_:_:_:_:)](coreservices/1446078-lscopyitemattributes.md)
- [LSSetExtensionHiddenForRef(_:_:)](coreservices/1442766-lssetextensionhiddenforref.md)
- [LSSetExtensionHiddenForURL(_:_:)](coreservices/1443948-lssetextensionhiddenforurl.md)
- [LSRegisterFSRef(_:_:)](coreservices/1444582-lsregisterfsref.md)