---
title: "CFNetServiceResolveWithTimeout(_:_:_:)"
framework: cfnetwork
role: symbol
role_heading: Function
path: "cfnetwork/cfnetserviceresolvewithtimeout(_:_:_:)"
---

# CFNetServiceResolveWithTimeout(_:_:_:)

Gets the IP address or addresses for a CFNetService.

## Declaration

```swift
func CFNetServiceResolveWithTimeout(_ theService: CFNetService, _ timeout: CFTimeInterval, _ error: UnsafeMutablePointer<CFStreamError>?) -> Bool
```

## Parameters

- `theService`: The CFNetService to resolve; cannot be NULL. The resolution will fail if the service doesn’t have a domain, a type, and a name.
- `timeout`: Value of type CFTimeInterval specifying the maximum amount of time allowed to perform the resolution. If the resolution is not performed within the specified amount of time, a timeout error will be returned. If timeout is less than or equal to zero, an infinite amount of time is allowed.
- `error`: Pointer to a doc://com.apple.documentation/documentation/CoreFoundation/CFStreamError structure that will be set to an error code and the error code’s domain if an error occurs; or NULL if you don’t want to receive the error code and its domain.

## Return Value

Return Value TRUE if an asynchronous service resolution was started or if a synchronous service resolution updated the CFNetService; FALSE if an asynchronous or synchronous resolution failed or timed out, or if a synchronous resolution was canceled.

## Discussion

Discussion This function updates the specified CFNetService with the IP address or addresses associated with the service. Call CFNetServiceGetAddressing(_:) to get the addresses. When resolving a service that runs in asynchronous mode, this function returns TRUE if the CFNetService has a domain, type, and name, and the underlying resolution process was started. Otherwise, this function returns FALSE. Once started, the resolution continues until it is canceled by calling CFNetServiceCancel(_:). When resolving a service that runs in synchronous mode, this function blocks until the CFNetService is updated with at least one IP address, until an error occurs, or until CFNetServiceCancel(_:) is called. Special Considerations This function is thread safe. If the service will be used in asynchronous mode, you must call CFNetServiceSetClient(_:_:_:) before calling this function.

## See Also

### Network Services

- [CFNetService](cfnetwork/cfnetservice.md)
- [CFNetServiceBrowser](cfnetwork/cfnetservicebrowser.md)
- [CFNetServiceBrowserFlags](cfnetwork/cfnetservicebrowserflags.md)
- [CFNetServiceMonitor](cfnetwork/cfnetservicemonitor.md)
- [CFNetServiceMonitorType](cfnetwork/cfnetservicemonitortype.md)
- [CFNetServiceClientContext](cfnetwork/cfnetserviceclientcontext.md)
- [CFNetServiceRegisterFlags](cfnetwork/cfnetserviceregisterflags.md)
- [CFNetServicesError](cfnetwork/cfnetserviceserror.md)
- [CFNetServiceBrowserInvalidate(_:)](cfnetwork/cfnetservicebrowserinvalidate(_:).md)
- [CFNetServiceBrowserScheduleWithRunLoop(_:_:_:)](cfnetwork/cfnetservicebrowserschedulewithrunloop(_:_:_:).md)
- [CFNetServiceBrowserCreate(_:_:_:)](cfnetwork/cfnetservicebrowsercreate(_:_:_:).md)
- [CFNetServiceBrowserGetTypeID()](cfnetwork/cfnetservicebrowsergettypeid().md)
- [CFNetServiceBrowserSearchForDomains(_:_:_:)](cfnetwork/cfnetservicebrowsersearchfordomains(_:_:_:).md)
- [CFNetServiceBrowserSearchForServices(_:_:_:_:)](cfnetwork/cfnetservicebrowsersearchforservices(_:_:_:_:).md)
- [CFNetServiceBrowserStopSearch(_:_:)](cfnetwork/cfnetservicebrowserstopsearch(_:_:).md)