waitKeyEx1

waitKeyEx1 is a function primarily found in older versions of certain software development kits or libraries, particularly those related to multimedia processing or graphical user interfaces. Its purpose is to pause program execution for a specified duration, waiting for a keyboard event. The "Ex1" suffix often indicates an extended or experimental version of a base `waitKey` function, suggesting it might have additional parameters or slightly different behavior.

Typically, `waitKeyEx1` would accept a timeout value, usually in milliseconds. If a key is pressed within this timeout period, the function would return a value representing the pressed key. If the timeout expires before any key is pressed, the function would return a specific indicator, often a negative value, to signify that no event occurred. This functionality is crucial for interactive applications, allowing them to respond to user input without consuming excessive CPU resources while waiting. It's commonly used in conjunction with displaying images or video frames, where a pause is needed to allow the user to view the content and potentially interact with it before the program proceeds. The exact implementation and return values can vary significantly depending on the specific library or SDK it originates from.