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