syntax-error - 语法错误，基本中缺少符号

Question

您好，每次我尝试运行以下程序:

L=-1
OPEN "tty.usbserial-FTG7QLFS:300,N,8,1,CS0,DS" FOR OUTPUT AS #1
WHILE L
    J=63
    MENU:   PRINT
        PRINT
        PRINT
        PRINT
        PRINT
        PRINT

    PRINT "WAITING FOR KEYSTROKE COMMAND"
        PRINT "TYPE:"
        PRINT "  C-CLOSE SHUTTER"
        PRINT "  O-OPEN SHUTTER"
        PRINT "  R-RESET CONTROL"
        PRINT "  Q-TERMINATE PROGRAM"
        PRINT
        PRINT

    START:
    A$ = INKEY$
    IF A$ = "O" THEN
        PRINT #1,CHR$(J+1);
        PRINT "SHUTTER OPEN COMMAND SENT"
        GOSUB TIMEOUT
        GOTO MENU
        ELSEIF A$ = "C" THEN
            PRINT #1,CHR$(J+2);
            PRINT "SHUTTER CLOSE COMMAND SENT"
            GOSUB TIMEOUT
            GOTO MENU
        ELSEIF A$ = "R" THE
            PRINT #1,CHR$(J+3);
            PRINT "CONTROL RESET COMMAND SENT"
            GOSUB TIMEOUT
            GOTO MENU
        ELSEIF A$ = "Q" THEN
            L = 0
            PRINT "PROGRAM TERMINATED"
        ELSE GOTO START
    END IF
WEND
END
TIMEOUT:    FOR I=1 TO 100:NEXT I
             CLS 0
             RETURN

我收到以下错误“语法错误，第6行缺少符号”，但是在第6行只有一条打印语句，因此我无法弄清缺少的内容。我正在Mac OS X上通过Chipmunk Basic运行该程序。

谢谢

Answer 1

我猜

OPEN "tty.usbserial-FTG7QLFS:300,N,8,1,CS0,DS" AS#1

缺少文件访问模式。也许编译器正在寻找这样的 token 但没有成功，因此放弃了。

花栗鼠BASIC文档说:

open STRINGEXPR for { input|output|append } as # FNUM
-- or --
open STRINGEXPR for random as # FNUM len = VAL

参见http://anoved.net/cbasdox/statements.html#open

我不是很了解Chipmunk BASIC，但在其他BASIC方言(QBasic，FreeBASIC，VisualBASIC Classic等)中，您必须声明要打开文件的操作。

FreeBASIC示例:

OPEN SomeFile FOR INPUT AS #1     ' input (read-only)
OPEN OtherFile FOR OUTPUT AS #2   ' write (replace existing file)
OPEN FooFile FOR BINARY AS #3     ' binary (read + write)

就像在C-ish语言中使用fopen时指定“r”，“r +”，...一样。