Microsoft KB Archive/49385

= Example Passing Numerics from Basic to MASM by Far Reference =

Article ID: 49385

Article Last Modified on 8/16/2005

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APPLIES TO


 * Microsoft QuickBasic 4.0
 * Microsoft QuickBASIC 4.0b
 * Microsoft QuickBasic 4.5 for MS-DOS
 * Microsoft BASIC Compiler 6.0
 * Microsoft BASIC Compiler 6.0b
 * Microsoft BASIC Professional Development System 7.0
 * Microsoft BASIC Professional Development System 7.1

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This article was previously published under Q49385



SUMMARY
The two programs below demonstrate how a Microsoft Basic program can pass standard numeric types to assembly language routines.



MORE INFORMATION
For more information about passing other types of parameters between Basic and MASM, search in the Microsoft Knowledge Base using the following word:

BAS2MASM

Code Example
The following Basic program is BNUMFAR.BAS, which passes standard numeric types to assembly language routines: DECLARE SUB Numint(SEG i%) DECLARE SUB Numlong(SEG l&) DECLARE SUB Numsng(SEG s!) DECLARE SUB Numdbl(SEG d#) i% = 2 l& = 4 s! = 3.4 d# = 5.6 CLS

PRINT &quot;        BEFORE&quot;,&quot;AFTER&quot; PRINT &quot;Integer: &quot;;i%,, CALL Numint(i%) PRINT i%

PRINT &quot;Long  : &quot;;HEX$(l&),, CALL Numlong(l&) PRINT HEX$(l&)

PRINT &quot;Single : &quot;;s!, CALL Numsng(s!) PRINT s!

PRINT USING &quot;Double : ##.####           &quot;;d#, CALL Numdbl(d#) PRINT USING &quot;##.####&quot;; d#

END The following program is ANUMFAR.ASM, which accepts standard numerics by far reference and alters their values: ; The following handy .MODEL MEDIUM,Basic directive is found in MASM .MODEL MEDIUM, Basic .CODE PUBLIC Numint, Numlong, Numsng, Numdbl Numint PROC push bp       mov bp, sp        ; set stack frame push es       mov es, [bp+8]    ; get seg mov bx, [bp+6]   ; get offset mov ax, es:[bx]  ; get actual integer shl ax, 1        ; multiply by 2 mov es:[bx], ax  ; put back new value pop es       pop bp        ret 4 Numint ENDP
 * 5.10 but not in earlier versions:

Numlong PROC push bp       mov bp, sp        ; set stack frame push es       mov es, [bp+8]    ; get seg mov bx, [bp+6]   ; get offset mov cx, es:[bx]  ; get actual long mov ax, es:[bx+2] ; switch high and low words mov es:[bx+2], cx ; put back new value mov es:[bx], ax       pop es        pop bp        ret 4 Numlong ENDP

Numsng PROC push bp       mov bp, sp        ; set stack frame push es       mov es, [bp+8]    ; get seg mov bx, [bp+6]   ; get offset mov ax, es:[bx+2] ; get actual single or ah, 80h       ; set sign bit mov es:[bx+2], ax ; put back new value pop es       pop bp        ret 4 Numsng ENDP

Numdbl PROC push bp       mov bp, sp         ; set stack frame push es       mov es, [bp+8]     ; get seg mov bx, [bp+6]    ; get offset mov ax, es:[bx+6] ; get actual double or ah, 80h        ; set sign bit mov es:[bx+6], ax ; put back new value pop es       pop bp        ret 4 Numdbl ENDP

END To demonstrate these programs from an .EXE program, compile and link as follows:

BC /O BNUMFAR.BAS;

MASM ANUMFAR.ASM;

LINK BNUMFAR ANUMFAR;

BNUMFAR.EXE produces the following output:            BEFORE     AFTER Integer: 2          4 Long  :  4          40000 Single : 3.4       -3.4 Double : 5.6000    -5.6000

Additional query words: QuickBas BasicCom

Keywords: KB49385

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