Install_Mult_IO_Handlers

include vmm.inc

mov     edi, OFFSET32 IOTable   ; points to an I/O table
VMMCall Install_Mult_IO_Handlers

jnc     installed               ; carry flag clear if all procedures installed
mov     [BadPort], edx          ; I/O port number that failed
 

Installs I/O callback procedures for one or more I/O ports. For Windows 95, this service can be called following initialization. Uses Flags.

• Returns with the carry flag clear if all callback procedures were installed, set otherwise. If the carry flag is set, the EDX register contains the number of the I/O port for which the procedure could not be installed.

IOTable

Address of an I/O table created using the Begin_Vxd_IO_Table, End_Vxd_IO_Table, and Vxd_IO macros. For more information about the table, see below.

This service repeatedly calls the Install_IO_Handler service until all entries in the specified I/O table have been installed.

A virtual device can create an I/O table using the Begin_Vxd_IO_Table, End_Vxd_IO_Table, and Vxd_IO macros. The following example shows a table containing three entries for ports 30, 31, and 32:

Begin_Vxd_IO_Table  My_IO_Table
Vxd_IO              30,IO_Handler_1
Vxd_IO              31,IO_Handler_2
Vxd_IO              32,IO_Handler_1
End_Vxd_IO_Table    My_IO_Table
 

See Also

Begin_Vxd_IO_Table, End_Vxd_IO_Table, Install_IO_Handler, Vxd_IO