niDCPower_GetAttributeViReal64

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Updated2023-04-15
2 minute(s) read

ViStatus niDCPower_GetAttributeViReal64(ViSession vi, ViConstString channelName, ViAttr attribute, ViReal64 *value);

Purpose

Queries the value of a ViReal64 attribute.

You can use this function to get the values of device-specific attributes and inherent IVI attributes.

Parameters

Input
Name	Type	Description
vi	ViSession	Identifies a particular instrument session. vi is obtained from the niDCPower_InitializeWithIndependentChannels function.
channelName	ViConstString	Specifies the channel(s) to use. Specify the channel(s) using the form PXI1Slot3/0,PXI1Slot3/2-3,PXI1Slot4/2-3 or PXI1Slot3/0,PXI1Slot3/2:3,PXI1Slot4/2:3, where PXI1Slot3 and PXI1Slot4 are instrument resource names and 0, 2, and 3 are channels. If you pass "" for this control, all channels in the session are used.
attribute	ViAttr	Specifies the ID of an attribute. From the function panel window, you can use this control as follows. In the function panel window, click on the control or press Enter or the spacebar to display a dialog box containing hierarchical list of the available attributes. Help text is shown for each attribute. Select an attribute by double-clicking on it or by selecting it and then pressing Enter. A ring control at the top of the dialog box allows you to see all IVI attributes or only the attributes of type ViReal64. If you choose to see all IVI attributes, the data types appear to the right of the attribute names in the list box. Attributes with data types other than ViReal64 are dim. If you select an attribute data type that is dim, LabWindows/CVI transfers you to the function panel for the corresponding function that is consistent with the data type. If you want to enter a variable name, press Ctrl+T to change this ring control to a manual input box. If the attribute in this ring control has named constants as valid values, you can view the constants by moving to the value control and pressing Enter.
Output
Name	Type	Description
value	ViReal64*	Returns the current value of the attribute. Passes the address of a ViReal64 variable. If the attribute currently showing in the attribute ring control has constants as valid values, you can view a list of the constants by pressing Enter on this control. Select a value by double-clicking on it or by selecting it and then pressing Enter.

Return Value

Name	Type	Description
Status	ViStatus	Reports the status of this operation. To obtain a text description of the status code, call the niDCPower_error_message function. To obtain additional information concerning the error condition, call the niDCPower_GetError function.

NI-DCPower C Function Reference Help

Table of Contents

niDCPower_GetAttributeViReal64

Purpose

Parameters

Return Value

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