mmioInstallIOProc

The mmioInstallIOProc function installs or removes a custom I/O procedure. This function also locates an installed I/O procedure, using its corresponding four-character code.

LPMMIOPROC mmioInstallIOProc(
  FOURCC fccIOProc,    
  LPMMIOPROC pIOProc,  
  DWORD dwFlags        
);
 

Parameters

fccIOProc

Four-character code identifying the I/O procedure to install, remove, or locate. All characters in this code should be uppercase.

pIOProc

Address of the I/O procedure to install. To remove or locate an I/O procedure, set this parameter to NULL. For more information about the I/O procedure, see MMIOProc.

dwFlags

Flag indicating whether the I/O procedure is being installed, removed, or located. The following values are defined:

MMIO_FINDPROC

Searches for the specified I/O procedure.

MMIO_GLOBALPROC

This flag is a modifier to the MMIO_INSTALLPROC flag and indicates the I/O procedure should be installed for global use. This flag is ignored if MMIO_FINDPROC or MMIO_REMOVEPROC is specified.

MMIO_INSTALLPROC

Installs the specified I/O procedure.

MMIO_REMOVEPROC

Removes the specified I/O procedure.

Return Values

Returns the address of the I/O procedure installed, removed, or located. Returns NULL if there is an error.

QuickInfo

  Windows NT: Requires version 3.1 or later.
  Windows: Requires Windows 95 or later.
  Windows CE: Unsupported.
  Header: Declared in mmsystem.h.
  Import Library: Use winmm.lib.
  Unicode: Implemented as Unicode and ANSI versions on Windows NT.

See Also

Multimedia File I/O Overview, Multimedia File I/O Functions, MMIOProc