Command
QisLib_GetDataVectorExactWindows

QisLib_GetDataVectorExactWindows

Function:
	int QisLib_GetDataVectorExactWindows(const CQisWindow* WindowList, int NumWindows);

Inputs:
	WindowList: List of Windows. (each with lower left and upper right vertices)
	NumWindows: Number of Windows in the list.

Return:
	success: 0
	failure: one of the following values :

Errors:
	-1: QisLib has not been initialized.
	-2: The callback function to handle vector data has not been set.
	-3: Internal error occurred while processing vector data.
	-4: One or more of the input arguments is invalid (null).
	-5: File open in progress, operation not permitted.

Description:
	- This function can be used to get vector data for multiple windows.
	- Its behavior is similar to multiple combination calls to QisLib_SetExactWindow and
	QisLib_GetDataVector.
	- In order to use this function, a vector data handler must be set using
	QisLib_SetVectorDataCallback.