sample11.c

此源码事基于ＣＶＩ的

#include <utility.h>
#include <easyio.h>
#include <cvirte.h>		/* Needed if linking in external compiler; harmless otherwise */
#include <userint.h>
#include "sample11.h"

#define MAX_CH_NUM 4
#define SCAN_NUM 100

static int panelHandle;
unsigned long  numChannels;
unsigned long  taskID;
short          device;
char           channelString[100];
double         waveform[MAX_CH_NUM*SCAN_NUM];

int main (int argc, char *argv[])
{
	if (InitCVIRTE (0, argv, 0) == 0)	
		return -1;	
		
	if ((panelHandle = LoadPanel (0, "sample11.uir", PANEL)) < 0)
		return -1;
		
	DisableBreakOnLibraryErrors();
	
	DisplayPanel (panelHandle);
	RunUserInterface ();
	
	EnableBreakOnLibraryErrors();
	return 0;
}

int CVICALLBACK TimerCallback (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	int i;
	unsigned long scanBacklog;
	switch (event)
		{
		case EVENT_TIMER_TICK:
		
            //获取已采集的数据长度
            AICheckAcquisition (taskID, &scanBacklog);
            
            //检查采集是否完毕
            if (scanBacklog >= SCAN_NUM)
            {
                //读取数据
                AIReadAcquisition (taskID, SCAN_NUM, LATEST_MODE,
                                           &scanBacklog, GROUP_BY_CHANNEL, waveform);
            
                //删除控件GRAPH上的所有曲线
                DeleteGraphPlot (panel, PANEL_GRAPH, -1, VAL_DELAYED_DRAW);

                //作曲线图
                for (i=0; i<numChannels; i++)
                    PlotY (panel, PANEL_GRAPH, &waveform[i*SCAN_NUM], SCAN_NUM,
                           VAL_DOUBLE, VAL_THIN_LINE, VAL_EMPTY_SQUARE, VAL_SOLID, 1,
                           VAL_GREEN);
                           
                //设置控件SAMPLE、DEVICE、CHANNEL有效
                SetCtrlAttribute (panelHandle, PANEL_SAMPLE, ATTR_DIMMED, 0);
				SetCtrlAttribute (panelHandle, PANEL_DEVICE, ATTR_DIMMED, 0);
				SetCtrlAttribute (panelHandle, PANEL_CHANNEL, ATTR_DIMMED, 0);
		
                //设置TIMER控件无效
                SetCtrlAttribute (panel, control, ATTR_ENABLED, 0);
            }

			break;
		}
	return 0;
}

int CVICALLBACK SampleCallback (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
		{
		case EVENT_COMMIT:
		
                //获取控件DEVICE和CHANNEL的值
                GetCtrlVal (panel, PANEL_DEVICE, &device);
                GetCtrlVal (panel, PANEL_CHANNEL, channelString);
                
                //获取采样通道数
                GetNumChannels (device, channelString, ANALOG_INPUT, 
                                    &numChannels);
                                    
                //开始采样
                AIStartAcquisition (device, channelString, SCAN_NUM*numChannels, 2000,
									5.0, -5.0, 0, &taskID);
									
                //设置控件SAMPLE、DEVICE、CHANNEL无效
                SetCtrlAttribute (panelHandle, PANEL_SAMPLE, ATTR_DIMMED, 1);
				SetCtrlAttribute (panelHandle, PANEL_DEVICE, ATTR_DIMMED, 1);
				SetCtrlAttribute (panelHandle, PANEL_CHANNEL, ATTR_DIMMED, 1);
				
                //设置TIMER控件有效
                SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 1);
		   break;
		}
	return 0;
}

int CVICALLBACK PanelCallback (int panel, int event, void *callbackData,
		int eventData1, int eventData2)
{
	switch (event)
		{
		case EVENT_CLOSE:
		
			QuitUserInterface (0);
			
			break;
		}
	return 0;
}

int CVICALLBACK QuitCallback (int panel, int control, int event,
		void *callbackData, int eventData1, int eventData2)
{
	switch (event)
		{
		case EVENT_COMMIT:
		
			QuitUserInterface (0);
			
			break;
		}
	return 0;
}