操作符 [] (String Index)
返回对字符串中字符的引用
Declare Operator [] ( ByRef lhs As String, ByRef rhs As Integer ) ByRef As UByte
Declare Operator [] ( ByRef lhs As ZString, ByRef rhs As Integer ) ByRef As UByte
Declare Operator [] ( ByRef lhs As WString, ByRef rhs As Integer ) ByRef As T
result = lhs [ rhs ]
lhs
此运算符返回对字符串中特定字符的引用：
会打印
语法
Declare Operator [] ( ByRef lhs As String, ByRef rhs As Integer ) ByRef As UByte
Declare Operator [] ( ByRef lhs As ZString, ByRef rhs As Integer ) ByRef As UByte
Declare Operator [] ( ByRef lhs As WString, ByRef rhs As Integer ) ByRef As T
用法
result = lhs [ rhs ]
参数
lhs
字符串（字符串引用，而不是作为本地副本返回的字符串）。
rhs 与第一个字符基于零的偏移量。
T 宽字符类型（每个平台不同）。
说明
此运算符返回对字符串中特定字符的引用：
- 由于引用未定义（引发运行时错误），因此在空字符串的情况下不得使用此运算符。
- 否则，用户必须确保索引不超过范围“[0, Len(lhs ) - 1]”。在这个范围之外，结果是未定义的。
例子
Dim a As String = "你好，世界！"
Dim i As Integer
For i = 0 To Len(a) - 1
Print Chr(a[i]) & "";
Next i
Print
Dim i As Integer
For i = 0 To Len(a) - 1
Print Chr(a[i]) & "";
Next i
会打印
H e l l o , w o r l d !
与QB差别
- 新的FreeBASIC
参考