通过一个抢答器的项目设计了解CVI常用控件的几个基本使用方法。

设定和读取控件值方法：

控件值一般是控件的最主要的一个属性值，如按钮的ON/OFF状态；number的数值等。

GetCtrlVal (面板名, 控件名, 返回值地址)：获取控件值；
SetCtrlVal (面板名, 控件名, 设定值)：设定控制值;

设定和读取控件属性方法：

具体某个控件的属性名关键字，可以通过帮助或函数输入助手查询到。

GetCtrlAttribute (面板名, 控件名, 属性名,返回值地址 );
SetCtrlAttribute (面板名, 控件名, 属性名,设定值);

界面设计：

打开CVI开发软件，通过模板创建一个项目，在面板上拖放相关控件，效果如下图。

拖放一个COMMAND button控件作为退出按钮；拖放一个SWITCH控件作为主持人开关；拖放6个LED控件指示抢答结果；拖放6个toggle button控件为抢答按钮；顶部一个string控件显示开始抢答的状态指示；

当主持人开关在ON位置时，开始抢答，任意选手按下按钮，点亮相应LED灯，其它选手不能再抢答。

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全部代码如下:

#include <cvirte.h>
#include <userint.h>
#include "CVIResponder.h"
static int panelHandle;
//全局变量，主持人开关状态
int startflag=0 ;
//复位各控件状态
void ResetCtrlStatus()
{
  //把LED灯控件全部灭掉
  SetCtrlVal (panelHandle, PANEL_LED1, 0);
  SetCtrlVal (panelHandle, PANEL_LED2, 0);
  SetCtrlVal (panelHandle, PANEL_LED3, 0);
  SetCtrlVal (panelHandle, PANEL_LED4, 0);
  SetCtrlVal (panelHandle, PANEL_LED5, 0);
  SetCtrlVal (panelHandle, PANEL_LED6, 0);
  //把抢答按钮置于未选择状态
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON1,0);
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON2,0);
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON3,0);
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON4,0);
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON5,0);
  SetCtrlVal(panelHandle,PANEL_TOGGLEBUTTON6,0);

  //抢答按钮初始状态禁止操作
  SetCtrlDimmed();
}

//设置抢答按钮禁止使用
void SetCtrlDimmed()
{
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON1, ATTR_DIMMED, 1);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON2, ATTR_DIMMED, 1);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON3, ATTR_DIMMED, 1);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON4, ATTR_DIMMED, 1);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON5, ATTR_DIMMED, 1);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON6, ATTR_DIMMED, 1);
}

//设置抢答按钮允许使用
void ResetCtrlDimmed()
{
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON1, ATTR_DIMMED, 0);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON2, ATTR_DIMMED, 0);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON3, ATTR_DIMMED, 0);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON4, ATTR_DIMMED, 0);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON5, ATTR_DIMMED, 0);
  SetCtrlAttribute (panelHandle, PANEL_TOGGLEBUTTON6, ATTR_DIMMED, 0);
}

//抢答器程序，num表示几号抢答按钮被按下
void Responder(int num)
{
  if(startflag){
    switch (num)
    {
      case 1:
        SetCtrlVal(panelHandle,PANEL_LED1,1);
        break;
    case 2:
      SetCtrlVal(panelHandle,PANEL_LED2,1);
      break;
    case 3:
      SetCtrlVal(panelHandle,PANEL_LED3,1);
      break;
    case 4:
      SetCtrlVal(panelHandle,PANEL_LED4,1);
      break;
    case 5:
      SetCtrlVal(panelHandle,PANEL_LED5,1);
      break;
    case 6:
      SetCtrlVal(panelHandle,PANEL_LED6,1);
      break;
    default:
      break;
  }
  SetCtrlDimmed();
}
}

int main (int argc, char *argv[])
{
  if (InitCVIRTE (0, argv, 0) == 0)
    return -1; /* out of memory */
  if ((panelHandle = LoadPanel (0, "CVIResponder.uir", PANEL)) < 0)
    return -1;
  DisplayPanel (panelHandle);
  ResetCtrlStatus();
  RunUserInterface ();
  DiscardPanel (panelHandle);
  return 0;
}

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

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

int CVICALLBACK btnPerson1 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(1);
      break;
  }
  return 0;
}

int CVICALLBACK btnPerson2 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(2);
      break;
  }
  return 0;
}

int CVICALLBACK btnPerson3 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(3);
      break;
  }
  return 0;
}

int CVICALLBACK btnPerson4 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(4);
      break;
  }
  return 0;
}

int CVICALLBACK btnPerson5 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(5);
      break;
  }
  return 0;
}

int CVICALLBACK btnPerson6 (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      Responder(6);
      break;
  }
  return 0;
}

int CVICALLBACK btnSwitch (int panel, int control, int event,void *callbackData, int eventData1, int eventData2)
{
  switch (event)
  {
    case EVENT_COMMIT:
      GetCtrlVal (panelHandle, PANEL_BINARYSWITCH, &startflag);
      if(startflag)
      {
        SetCtrlAttribute (panelHandle, PANEL_STRING, ATTR_TEXT_COLOR, VAL_GREEN);
        ResetCtrlDimmed();
      }
      else
      {
        SetCtrlAttribute (panelHandle, PANEL_STRING, ATTR_TEXT_COLOR, VAL_GRAY);
        ResetCtrlStatus();
      }
      break;
   }
  return 0;
}

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

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