Calling assembly code in VC environment

In the VC environment, the assembly code is called.

Programming Environment: VC6 and MASM 6.11

The main program is as follows:

Masm_C.cpp:Defines the entry point for the console application.

//

<?xml:namespace prefix = o ns = "Urn:schemas-microsoft-com:office:office"/>

#include <stdio.h>

extern "C" int _cdecl Add (int a);

void Main ()

{

int a = 1;

printf ("Before add (a) a =%d/n", a);

A = Add (a); Add implements a simple addition to a sub-function, which is implemented using a compilation

printf ("After add (a) a =%d/n", a);

Return

}

Its assembly code is:

; Add.asm

.386

Public _add

_text segment byte Public ' code '

Assume Cs:_text

_add proc Near

Push EBP

MOV Ebp,esp

mov eax,[ebp+8]; here ebp+8 is the value of the passed parameter a

inc EAX; add eax as a return value

Pop EBP

Ret

_add ENDP

_text Ends

End

This section of assembly language is compiled with ML but not connected

D:/MASM611/BIN>ML/C/coff Add.asm

Microsoft (R) Macro assembler Version 6.11

Copyright (C) Microsoft Corp 1981-1993. All rights reserved.

Assembling:add.asm

Generate Add.obj.

The next step is to link CPP and ASM together. Copy the add.obj to the Masm_c directory, and project-----setting------link to add add.obj to the project options in link, separated from the other lib spaces. Passed after compilation.

The result is:

Before add (a) a = 1

After add (a) a = 2

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