InstallShield 2019 » InstallScript Language Reference
A constant is a named data item with a defined value. InstallShield supports two types of constants:
| • | Predefined constants, such as TRUE and RESET, are part of InstallScript. These constants, which are used as function parameters and return values for built-in functions, cannot be redefined in the script. Attempting to redefine a predefined constant results in a compiler error. |
| • | User-defined constants are declared by the programmer as needed for individual scripts. Although a user-defined constant can be redefined after the initial declaration, it is generally not considered good programming practice to do so. |
User-defined constants are declared with a #define preprocessor statement. (InstallScript does not support the const keyword for declaring variable constants as the C++ language does.) String constants must be enclosed within quotation marks; numeric constants are defined without quotation marks and contain only numeric characters. Once declared, a string constant can be used anywhere that a string literal can be used. Likewise, number constants can be used anywhere that a numeric literal can be used.
In the following example, a string constant and a numeric constant are declared:
#define COMPANY_NAME "Example_Company"
#define MAXCOUNT 1000
A constant name must follow the rules for InstallScript identifiers. By convention, constant identifiers are created with all uppercase characters. InstallScript’s predefined constants follow that convention.
See Also
Defining Constants Through the Compiler
Defining Constants Through the Compiler
Using String Entries in InstallShield
InstallShield 2019 Help LibraryApril 2019 |
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