Question

您每次尝试运行以下程序时都好：

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行中缺少符号”，但在第6行只有一个打印语句，所以我无法弄清楚我错过了什么。我在Mac OS X上通过Chipmunk Basic运行程序。

由于

Answer 1

我想

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令牌而没有成功，并且放弃了下一行。

Chipmunk BASIC文档说：

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

请参阅http://anoved.net/cbasdox/statements.html#open

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

示例FreeBASIC：

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 +”，...

语法错误，Basic中缺少符号

1 个答案: