Article ID: 49396
Article Last Modified on 11/21/2006
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 Q49396
SUMMARY
The two programs below demonstrate how a Microsoft Basic program passes a variable-length string to assembly language by near 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 BSTR.BAS, which passes the offset of a variable-length string to assembly language:
DECLARE SUB RString(BYVAL soff AS INTEGER)
A$ = "This is the string" + "$" ' "$" terminates string for INT call
CALL RString(SADD(A$))
END
The following program is ASTR.ASM, which gets the address of a variable-length string and prints the string out:
.MODEL MEDIUM
.CODE
PUBLIC RString
RString PROC
push bp
mov bp, sp ; set stack frame
mov dx, [bp+6] ; get offset to string
mov ah, 9 ; DOS interrupt to print string
int 21h
pop bp
ret 2
RString ENDP
END
To demonstrate these programs from an .EXE program, compile and link as follows:
BC BSTR.BAS;
MASM ASTR.ASM;
LINK BSTR ASTR;
BSTR.EXE produces the following output:
This is the string
Additional query words: QuickBas BasicCom
Keywords: KB49396
