Read functions

Functions
int32_t	VkDaqGetTaskData (const char *task, double dat[], int32_t sampsPerChan, int32_t fillmode, double timeout)
	Get task data.

Detailed Description

Function Documentation

VkDaqGetTaskData()

int32_t VkDaqGetTaskData	(	const char *	task,
		double	dat[],
		int32_t	sampsPerChan,
		int32_t	fillmode,
		double	timeout
	)

Get task data.

dat

data type	parameter	describe
const char*	task	Task name.
double[]	dat[]	Task data buffer, its size must be greater than or equal to the number of channels x sampsPerChan.
int32_t	sampsPerChan	The number of samples, per channel, to read.
int32_t	fillmode	Specifies whether or not the samples are interleaved. 0: Group by scan number (interleaved). 1: Group by channel (non-interleaved)
double	timeout	The waiting time for the function to read the sample (in seconds, double type, can be set within one second).

Returns

On success, return value >= 0, indicating the actual number of samples read by each channel
For example, the number of samples to be read for each channel (sampsPerChan) is 1000, and the number of channels is 8. The size of the provided task data buffer (dat []) must be ≥ 1000 * 8. Running successfully returns 1000 (actual number of samples), data has been written to the buffer

On failure, returns a negative error number.For detail, please Call VkDaqGetLastErrorInfo

C language reference

#include <stdio.h>
#include "libvkdaq.h"
 
int main(int argc, char* argv[])
{
    const char* task = "task1";
    float64     data[1000]; 
 
    int32_t result = VkDaqCreateTask(task);
 
    result = VkDaqCreateAIVoltageChan(task, "dev1/AIN1", "", VkDaq_Val_SingleEnded, -10.0, 10.0, VkDaq_Val_Volts, "");
 
    result = VkDaqCfgSampClkTiming(task, VkDaq_Val_ClkSrc_OnBoardClk, 10000, VkDaq_Val_Rising, VkDaq_Val_FiniteSamps, 1000);
 
    result = VkDaqStartTask(task); 
 
    result = VkDaqGetTaskData(task, data, 1000, VkDaq_Val_GroupByChannel, 1);
 
    if (result >= 0) {
        printf("Acquired %d samples.\n", result); 
        printf("Successful\n");
    }
    else {
        printf("Failed\n");
    }
 
    return 0;
}