while...endwhile

InstallShield 2015 » InstallScript Language Reference

Use the while statement when you want to execute one or more statements repeatedly, as long as a particular condition is true. If the condition is not true when the statement is first executed, the loop is not performed.

To create a while loop:

Set the variable you are using as the condition to an initial state.

Type the keyword while, followed by the conditional test in parentheses. Do not punctuate this line.

Build the operation(s) that you want repeated.

Add the operation that changes the test variable (for example, nCount = nCount + 1, or nCount = SomeVariable).

End the loop by typing endwhile, followed by a semicolon.

In the following example, the message box is displayed four times.

nCount = 1;

while (nCount < 5)

MessageBox ("This is still true.", INFORMATION);

nCount = nCount + 1;

endwhile;

Because nCount is assigned an initial value of 1, the while statement evaluates TRUE the first time it is executed; the message box is displayed and nCount is incremented by 1. After the fourth pass through the loop, nCount is equal to 5; the while statement evaluates FALSE and the program continues executing with the statement after endwhile.

Note: You cannot define a label within a while block. You can, however, nest while statements in InstallScript. You must end each while block with endwhile.

while...endwhile

InstallShield 2015 Help Library

June 2015