#undef

InstallShield 2019 » InstallScript Language Reference

Use the #undef directive to undefine a constant that was previously defined with #define. If you specify a constant with this directive that was not previously defined with the #define directive, an error will occur when you attempt to compile your script. In the following example, two constants are defined; then, the first constant is undefined if the second has been defined:

#define NORMSETUP

#define BONUSPAK

. . .

#ifdef NORMSETUP

    MessageBox('Compiling for normal setup .',INFORMATION);

#else

    MessageBox('Compiling for super setup.',INFORMATION);

#endif

#ifdef BONUSPAK

    #undef NORMSETUP

#endif

#ifdef NORMSETUP

    MessageBox('Compiling for normal setup .',INFORMATION);

#else

    MessageBox('Compiling for super setup.',INFORMATION);

#endif

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