Before writing a multimedia application, you should be familiar with programming in the Windows environment.
When using the multimedia services, you must include the MMSYSTEM.H header file in all source modules that call a multimedia function. This header file depends on declarations made in the WINDOWS.H header file, so you must first include WINDOWS.H. The MMSYSTEM.H header file provides function prototypes as well as definitions of multimedia data types and constants.
In addition to the normal Windows libraries, you must also link to the MMSYSTEM.LIB import library when linking an application that uses multimedia functions.