RFmxInstr_GetAttributeI64Array
- Updated2025-04-08
- 2 minute(s) read
Queries the value of an RFmx 64-bit integer (int64) 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.
Syntax
int32 __stdcall RFmxInstr_GetAttributeI64Array(niRFmxInstrHandle instrumentHandle, char selectorString[], int32 attributeId, int64 attrVal[], int32 arraySize, int32 *actualArraySize)
Remarks
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
| Name | Direction | Type | Description |
|---|---|---|---|
| instrumentHandle | [in] | niRFmxInstrHandle | Identifies the RFmx session. You can obtain this parameter from the RFmxInstr_Initialize function. |
| selectorString | [in] | char | Comprises the signal name. If you do not specify the signal name, the default signal instance is used. Example: "" "signal::sig1" You can use the BuildSignalString function to build the selector string. |
| attributeId | [in] | int32 | Pass the ID of an attribute. |
| attrVal | [out] | int64 | Returns the current value of the attribute. |
| arraySize | [in] | 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. |
| actualArraySize | [out] | int32 * | Returns the actual size of the array, if you pass NULL to all output array parameters, and set the arraySize parameter to 0. |
Returns
Returns the status code of this operation. The status code either indicates success or describes an error or warning condition. 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 |