Microsoft KB Archive/49393
Article ID: 49393
Article Last Modified on 11/21/2006
This article was previously published under Q49393
The two programs shown below demonstrate how a Microsoft Basic program passes a user-defined type 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.
For more information about passing other types of parameters between Basic and MASM, search in the Microsoft Knowledge Base using the following word:
The following Basic program is UNEAR.BAS, which passes a user-defined type to assembly language by near reference:
DEFINT A-Z TYPE mixed i AS INTEGER l AS LONG s AS SINGLE d AS DOUBLE fx AS STRING * 19 END TYPE DECLARE SUB MasmSub (dummy AS mixed) DIM dummy AS mixed CLS PRINT "Calling assembly routine to fill the user-defined type." CALL MasmSub(dummy) PRINT "Values in user-defined type:" PRINT "Integer: ", dummy.i PRINT "Long: ", dummy.l PRINT "Single: ", dummy.s PRINT "Double: ", dummy.d PRINT "fixed-length String: ", dummy.fx END
The following program is AUNEAR.ASM, which gets a Basic user-defined type by near reference and copies data into it:
.MODEL MEDIUM usrdefType STRUC iAsm DW 10 lAsm DD 43210 sAsm DD 32.10 dAsm DQ 12345.67 fxAsm DB 'Fixed-length string' usrdefType ENDS .DATA AsmRec usrdefType <> PUBLIC MasmSub MasmSub PROC push bp mov bp,sp ; set stack frame push es push di push si push cx push ds pop es mov di,[bp+6] ; get offset of user-defined type mov si,OFFSET AsmRec ; set up for copy mov cx,37 ; size of structure rep movsb ; copy values to Basic variable pop cx pop si pop di pop es pop bp ret 2 MasmSub ENDP END
To demonstrate these programs from an .EXE program, compile and link as follows:
LINK UNEAR UANEAR;
UNEAR.EXE produces the following output:
fixed-length String: Fixed-length string
Additional query words: QuickBas BasicCom