Article ID: 49389
Article Last Modified on 8/16/2005
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
This article was previously published under Q49389
SUMMARY
The two programs shown below demonstrate how Microsoft Basic passes a fixed-length string to assembly language by far reference.
This information about interlanguage calling applies to QuickBasic versions 4.00, 4.00b, and 4.50 for MS-DOS, to Microsoft Basic Compiler versions 6.00 and 6.00b for MS-DOS and MS OS/2, and to Microsoft Basic Professional Development System (PDS) versions 7.00 and 7.10 for MS-DOS and MS OS/2.
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 BFSTRF.BAS, which creates a fixed-length string and passes it to assembly language to be printed:
DECLARE SUB RString(BYVAL sseg AS INTEGER, BYVAL soff AS INTEGER)
DIM a AS STRING * 20
CLS
a = "Basic String$" ' "$" terminates string for assembly
CALL RString(VARSEG(a), VARPTR(a))
END
The following program is AFSTRF.ASM, which gets a fixed-length string from Basic and prints it:
.MODEL MEDIUM, Basic
.CODE
PUBLIC RString
RString PROC
push bp
mov bp, sp ; set stack frame
push ds
mov ds, [bp+8] ; segment of string
mov dx, [bp+6] ; offset of string
mov ah, 9 ; DOS interrupt to print string
int 21h
pop ds
pop bp
ret 4
RString ENDP
END
To demonstrate these programs from an .EXE program, compile and link as follows:
BC BFSTRF.BAS;
MASM AFSTRF.ASM;
LINK BFSTRF AFSTRF;
BFSTRF.EXE produces the following output:
Basic String
Additional query words: QuickBas BasicCom
Keywords: KB49389
