Function 440Ch Minor Code 4Ah Select Code Page

mov bx, Handle ;handle of device

mov ch, Category ;device category

mov cl, 4Ah ;Select Code Page

mov dx, seg CodePageID

mov ds, dx

mov dx, offset CodePageID ;ds:dx points to CODEPAGE structure

mov ax, 440Ch ;IOCTL for Character Device

int 21h

jc error_handler ;carry set means error

Select Code Page (Function 440Ch Minor Code 4Ah) selects the code page used by the specified device. The code page must be in the list of prepared code pages for the device.

Parameters

Handle

Identifies the device to set the code page for.

Category

Specifies the type of device. This parameter must be one of the following values:

Value

Device

01h	Serial device
03h	Console (screen)
05h	Parallel printer

CodePageID

Points to a CODEPAGE structure that contains the identifier of the code page to be selected. The CODEPAGE structure has the following form:

CODEPAGE STRUC

cpLength dw 2 ;structure size, excluding this field (always 2)

cpId dw ? ;code-page identifier

CODEPAGE ENDS

For a full description of the CODEPAGE structure, see Chapter 6, “National Language Support.”

Return Value

If the function is successful, the carry flag is clear. Otherwise, the carry flag is set.