niHWS_RetrieveAnalogWfmI8
C Function Prototype
tHWS_Status niHWS_RetrieveAnalogWfmI8 (const char filePath[], double* rate, double* gain, double* offset, long wfmBufferSize, char* wfmBuffer, long* numSamplesInWfm);
Purpose
Retrieves the analog waveform samples as 8-bit signed integers from the file specified.
Parameters
| Name | Type | Description |
|---|---|---|
| filePath | const char[] | Specifies the path and filename of the HWS file to create or open. The .hws extension is typically used for HWS files, although using this extension is optional. |
| rate | double* | The rate of the Sample clock used to capture the waveform. |
| gain | double* | This parameter is equivalent to element 1 of the coeffArray.
NI-HWS stores polynomial scaling coefficients that are intended to be applied to waveform data by your application or your hardware. The offset and gain parameters in the high-level Store and Retrieve functions are identical to the first two elements of the coeffArray in the Get and Set Scaling Coefficients functions. |
| offset | double* | This parameter is equivalent to element 0 of the coeffArray.
NI-HWS stores polynomial scaling coefficients that are intended to be applied to waveform data by your application or your hardware. The offset and gain parameters in the high-level Store and Retrieve functions are identical to the first two elements of the coeffArray in the Get and Set Scaling Coefficients functions. |
| wfmBufferSize | long | Specifies how many samples to read into wfmBuffer.
If wfmBufferSize is 0, the total number of samples in the waveform is returned in numSamplesInWfm. |
| wfmBuffer | char* | Contains the data for the waveform. This array must be large enough to contain at least the amount of data indicated by the value assigned to wfmBufferSize. |
| numSamplesInWfm | long* | Returns the total number of samples in the waveform. |