Command
QisLib_GetVertexInfo

QisLib_GetVertexInfo

Function:
	int QisLib_GetVertexInfo(CQisMetric X, CQisMetric Y);

Inputs:
	X: X-Coordinate of the vertex.
	Y: Y-Coordinate of the vertex.

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: File open in progress, operation not permitted.

Description:
	- This function can be used to output all data with a vertex near to the specified
	point.
	- The search area around the specified point defaults to 4 pixels. The user program
	can use QisLib_SetVertexInfoRadius to change the radius of the search area.
	- While executing this function, QisLib looks for boundary/path vertices, text, cell
	reference and array reference insertion points within the search area.
	- Just like QisLib_GetDataVector and QisLib_GetDisplayVector, this function returns
	data by calling a handler function set by the user program using
	QisLib_SetVectorDataCallback. This handler function must be set in order to use
	QisLib_GetWindowInfo.
	- Just as QisLib_GetDataVector, this function is not affected by display filters.
	- To stop this function while it is returning data, the user program can call
	QisLib_Stop. This feature can only be used if QisLib_SetProcessEvents is 'On' and
	for Unix/Linux, the program's application context was passed as a parameter to
	QisLib_InitLib.