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X Property Library Chapter 9
LabWindows/CVI Standard Libraries 9-8 © National Instruments Corporation
Parameters
Input
displayName
string Determines the X server connection and
which communication domain to use.
Output
display
DisplayPtrX
(passed by
reference)
Pointer to the display of the remote X server.
Use this value as the argument to other
library functions to communicate with the
remote X server.
rootWindow
WindowX
(passed by
reference)
Root window of the remote X server. Use
this value as the parameter to other library
functions to access properties on the root
window of the remote X server.
Return Values
The return value indicates the success or failure status of the function call. A negative value
indicates an error. status values are shown in the following table.
NoXErr
0 The function was successful.
InvalidParamXErr
-1 NULL was passed to one or more of the parameters.
TooManyConnectionsXErr
-6 The program has already made the maximum
number of connections as defined by the constant
MAX_X_DISPLAYS. Use
DisconnectFromXDisplay to allow more
connections.
CannotConnectXErr
-7 The connection could not be made to the X server.
This happens for a number of reasons including an
invalid display name, a network problem, or a
security problem.
Parameter Discussion
Valid values for displayName include any valid arguments to the Xlib function
XOpenDisplay. The format is hostname:server or hostname:server.screen,
where:
• hostname specifies the name of the host computer on which the display is physically
connected.
• server specifies the number of the server on its host computer (usually 0).
• screen specifies the number of the default screen on the server (usually 0).