Linking Assembly code to C++

can anybody help me how to create a link-able macro in Assembly language for C++ source code?
for example I want to create some routines in assembly that handle disk I/O and want to link them to my C++ code.
bluebird031198Asked:
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nietodCommented:
Yes, I can help.  If you want qualifications, I've written a 500,000 line assembly language program.

Can you provide some details.?
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nietodCommented:
What operatig system?  DOS I assume?
Is this for the x86 computers?
What C++ compiler?
Why not provide at least one example procedure of what you want?

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bluebird031198Author Commented:
if can just give some examples in DOS, Unix, or even others OS.
thanks for all
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nietodCommented:
Answer coming.
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nietodCommented:
; A convenient macro for making DOS interrupt service calls.
BDOS          MACRO         U,V
              IFNB          <V>
              MOV       AL,V
              ENDIF
              MOV           AH,U
              INT           21H
              ENDM

; Assemply procedure top opne a file in DOS.  Caller specifies the file name and the mode to open in.  Procedure returns a non-zero handle if it succeeds.  zero if it fails.
; Returns
; AX file handle.
OPNFIL PROC NEAR PASCAL DWORD FILNAM,BYTE OPNMOD
   LDS DX FILNAM
   BDOS 3Dh,OPNMOD
  JNC OPNFILEND:
  XOR AX,AX

OPNFILEND: RET
OPNFIL END
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nietodCommented:
from C++ you would use.

extern "C" HANDLE OPNFIL(char *FilNam,char Mode);

handle FilHnd = OPNFIL("c:\autoexec.bat",0);
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nietodCommented:
That's about the best I can offer without more input from you.  
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