DAQmxReadCounterScalarF64
int32 DAQmxReadCounterScalarF64 (TaskHandle taskHandle, float64 timeout, float64 *value, bool32 *reserved);
Purpose
Reads a single floating-point sample from a counter task. Use this function when the counter sample is scaled to a floating-point value, such as for frequency and period measurement.
Parameters
| Input | ||
| Name | Type | Description |
|---|---|---|
| taskHandle | TaskHandle | The task to read the sample from. |
| timeout | float64 | The amount of time, in seconds, to wait for the function to read the sample(s). The default value is 10.0 seconds. To specify an infinite wait, pass -1 (DAQmx_Val_WaitInfinitely). This function returns an error if the timeout elapses. A value of 0 indicates to try once to read the requested samples. If all the requested samples are read, the function is successful. Otherwise, the function returns a timeout error and returns the samples that were actually read. |
| reserved |
|
Reserved for future use. Pass NULL to this parameter. |
| Output | ||
| Name | Type | Description |
| value |
|
The sample read from the task. |
Return Value
| Name | Type | Description |
|---|---|---|
| status | int32 | The error code returned by the function in the event of an error or warning. A value of 0 indicates success. A positive value indicates a warning. A negative value indicates an error. |