Syntax |
String |
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Description |
A data type capable of holding a number of characters. |
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Comments |
Strings are used to hold sequences of characters, each character having a value between 0 and 255. Strings can be any length up to a maximum length of 32767 characters. Strings can contain embedded nulls, as shown in the following example: s$ = "Hello" + Chr$(0) + "there" 'String with embedded null |
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The length of a string can be determined using the Len function. This function returns the number of characters that have been stored in the string, including unprintable characters. The type-declaration character for String is $. |
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String variables that have not yet been assigned are set to zero-length by default. |
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Strings are normally declared as variable-length, meaning that the memory required for storage of the string depends on the size of its content. The following script statements declare a variable-length string and assign it a value of length 5: Dim s As String |
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Fixed-length strings are given a length in their declaration: Dim s As String * 20 |
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When a string expression is assigned to a fixed-length string, the following rules apply: |
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If the string expression is less than the length of the fixed-length string, then the fixed-length string is padded with spaces up to its declared length. |
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If the string expression is greater than the length of the fixed-length string, then the string expression is truncated to the length of the fixed-length string. Fixed-length strings are useful within structures when a fixed size is required, such as when passing structures to external routines. |
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The storage for a fixed-length string depends on where the string is declared, as described in the following table: |
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Strings Declared |
Are Stored |
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In structures |
In the same data area as that of the structure. Local structures are on the stack; public structures are stored in the public data space; and private structures are stored in the private data space. Local structures should be used sparingly as stack space is limited. |
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In arrays |
In the global string space along with all the other array elements. |
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Local routines |
On the stack. The stack is limited in size, so local fixed-length strings should be used sparingly. |
See Also |
Currency (data type);Date (data type); Double (data type); Integer (data type); Long (data type); Object (data type); Single (data type); Variant (data type); Boolean (data type); DefType (statement); CStr (function). |
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