Chapter 20: Using External Functions and Other Processing Extensions

Using utility functions to manage information

The utility functions provide a way to obtain and pass Windows information to external functions and can be used as arguments in the PowerScript Send function. There are four utility functions.

Utility functions

**Table 20-2: Utility functions**
Function	Return value	Purpose
Handle	UnsignedInt	Returns the handle to a specified object.
IntHigh	UnsignedInt	Returns the high word of the specified long value. IntHigh is used to decode Windows values returned by external functions or the LongParm attribute of the Message object.
IntLow	UnsignedInt	Returns the low word of the specified long value. IntLow is used to decode Windows values returned by external functions or the LongParm attribute of the Message object.
Long	Long	Combines the low word and high word into a long. The Long function is used to pass values to external functions.

Example

This script uses the external function CreateWindowEx to create a child window that displays a calendar. The Handle function is used to pass the handle to the parent window of the window being created:

// Instance variable: ulong g_hwndCal
g_hwndCal = CreateWindowEx( 0, ClassName, "", &
      WS_BORDER + WS_CHILD + WS_VISIBLE, &
      0,0,0,0, &
      Handle(this), 0, 0, 0 )

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