Int 2F/AX=1684h/BX=4321h

MS Windows - POSTMSG - GET API ENTRY POINT

AX = 1684h
BX = 4321h (virtual device ID for POSTMSG device) (see #02642)
ES:DI = 0000h:0000h

Return:
ES:DI -> VxD API entry point (see #02712,#02714)
0000h:0000h if the VxD does not support an API


(Table 02712)
Call POSTMSG protected-mode entry point with:
AX = window handle
CX:BX -> callback procedure (see #02713)

Return:
Nothing

Note: This call registers a WinApp with the VxD; the callback must be in a fixed, non-discardable code segment

See Also: #02714 - #02715

(Table 02713) Values POSTMSG callback routine is called with:.

STACK:
DWORD "lParam" parameter from DOSApp WORD "wParam" parameter from DOSApp WORD Windows message number (WM_USER + 100h) WORD registered HWND

(Table 02714) Call POSTMSG V86-mode entry point with:. BX = wParam value to pass to protected-mode callback. DX:AX = lParam value to pass to protected-mode callback

Return:
CF clear if successful CF set on error (no WinApp registered)

See Also: #02712

Category: Windows - Int 2Fh - M

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