# CFNetServiceBrowserSearchForServices(_:_:_:_:) Searches a domain for services of a specified type. ``` func CFNetServiceBrowserSearchForServices(_ browser: CFNetServiceBrowser, _ domain: CFString, _ serviceType: CFString, _ error: UnsafeMutablePointer?) -> Bool ``` ## Parameters `browser` The CFNetServiceBrowser, obtained by previously calling [`CFNetServiceBrowserCreate(_:_:_:)`](/documentation/CFNetwork/CFNetServiceBrowserCreate(_:_:_:)), that is to perform the search; cannot be `NULL`. `domain` The domain to search for the service type; cannot be `NULL`. To get the domains that are available for searching, call [`CFNetServiceBrowserSearchForDomains(_:_:_:)`](/documentation/CFNetwork/CFNetServiceBrowserSearchForDomains(_:_:_:)). `error` A pointer to a structure, that, if an error occurs, will be set to the error and the error’s domain and passed to your callback function. Pass `NULL` if you don’t want to receive the error that may occur as a result of this particular call. ## Return Value `TRUE` if the search was started (asynchronous mode); `FALSE` if another search is already in progress for this CFNetServiceBrowser or if an error occurred. ## Discussion This function searches the specified domain for services that match the specified service type. The search continues until the search is canceled by calling [`CFNetServiceBrowserStopSearch(_:_:)`](/documentation/CFNetwork/CFNetServiceBrowserStopSearch(_:_:)). When a match is found, the callback function specified when the CFNetServiceBrowser was created is called and passed an instance of a CFNetService representing the service that was found. In asynchronous mode, this function returns `TRUE` if the search was started. Otherwise, it returns `FALSE`. In synchronous mode, this function blocks until the search is stopped by calling [`CFNetServiceBrowserStopSearch(_:_:)`](/documentation/CFNetwork/CFNetServiceBrowserStopSearch(_:_:)) from another thread, in which case this function returns `FALSE`, or until an error occurs. ### Special Considerations This function is thread safe. For any one CFNetServiceBrowser, only one domain search or one service search can be in progress at the same time. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)