RFmxEVDO_GetAttributeI8Array
- Updated2024-10-14
- 2 minute(s) read
RFmxEVDO_GetAttributeI8Array
int32 __stdcall RFmxEVDO_GetAttributeI8Array (niRFmxInstrHandle instrumentHandle, char selectorString[], int32 attributeID, int8 attrVal[], int32 arraySize, int32 *actualArraySize);
Purpose
Queries the value of an RFmx 8-bit integer (int8) 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 RFmxEVDO_Initialize function. |
| selectorString | char[] | Specifies the selector string for the attribute being set. Refer to the Selector String (C/CVI) topic for more information about configuring the selector string. |
| 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 | int8[] | Returns the current value of the attribute. |
| actualArraySize | int32* | Returns the actual size of the array. If you set the arraySize parameter to 0, it returns the required array size. |
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 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 RFmxEVDO_GetError function. The general meaning of the status code is as follows:
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