RFmxInstr_GetAttributeF32Array

NI-RFmx GSM 2.5 Help

Edition Date: June 2018

Part Number: 375416F-01

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int32 __stdcall RFmxInstr_GetAttributeF32Array (niRFmxInstrHandle instrumentHandle, char channelName[], int32 attributeID, float32 attrVal[], int32 arraySize, int32 *actualArraySize);

Purpose

Queries the value of an RFmx 32-bit floating point number (float32) attribute. You must provide a char array to serve as a buffer for the value. Pass the number of bytes in the buffer as the arraySize parameter. If you want to call this function just to get the required buffer size, you must pass 0 for arraySize and NULL for the attrVal buffer.

If the current value of the attribute, including the terminating NULL byte, is larger than the size you indicate in the arraySize parameter, the function copies buffer size - 1 bytes into the buffer, places an ASCII NULL byte at the end of the buffer, and returns the buffer size you must pass to get the entire value. For example, if the value is "123456" and the buffer size is 4, the function places "123" into the buffer and returns 7.

Parameters

Input
Name Type Description
instrumentHandle niRFmxInstrHandle Specifies the instrument session. The RFmx driver obtains this parameter from the RFmxInstr_Initialize function.
channelName char[] Specifies the channel to which the settings must be applied. Specify an empty string as the value of this parameter.
attributeID int32 Pass the ID of an attribute.
arraySize int32 Specifies the size of the array. Set the arraySize parameter to 0 to get the size of all the arrays in the actualArraySize parameter.
Output
Name Type Description
attrVal float32[] Returns the current value of the attribute.
actualArraySize int32* Returns the actual size of the array, if you pass NULL to all output array parameters, and set the arraySize parameter to 0.

Return Value

Name Type Description
status int32 Returns the status code of this operation. The status code either indicates success or describes an error or warning. Examine the status code from each call to an RFmx function to determine if an error has occurred.

To obtain a text description of the status code and additional information about the error condition, call the RFmxInstr_GetError function.

The general meaning of the status code is as follows:

Value Meaning
0 Success
Positive Values Warnings
Negative Values Errors

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