原创 Labwindows/cvi8.5学习日志(24)-- windows API函数---电脑驱蚊程序

//*********************************************************
// Labwindows/cvi8.5 windows API函数---电脑驱蚊程序
// 演示了扬声器的使用
// szlihongtao
// 2010-06-19
// 参照 王建新的<Labwindows/cvi测试技术及工程应用> page245
// 稍有改写
//*********************************************************
#include "windows.h"   //包含文件，调用Windows API函数
#include <cvirte.h>  
#include <userint.h>
#include "mos.h"
//*********************************************************
static int duration;
static int frequency;  
static int panelHandle;
//*********************************************************
int main (int argc, char *argv[])
{
 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
 if ((panelHandle = LoadPanel (0, "mos.uir", PANEL)) < 0)
  return -1;
 DisplayPanel (panelHandle);
 RunUserInterface ();
 DiscardPanel (panelHandle);
 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;
}
//*********************************************************
int CVICALLBACK start (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 1);// 允许定时器的运行
   break;
 }
 return 0;
}
//*********************************************************
int CVICALLBACK timer (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_TIMER_TICK:
   
   //声音频率（从37Hz到32767Hz）,在windows95中忽略
   GetCtrlVal (panelHandle, PANEL_NUMERIC, &frequency);
   
   //声音的持续时间，以毫秒为单位
   GetCtrlVal (panelHandle, PANEL_NUMERIC_2, &duration);
   Beep(frequency, duration);
   break;
 }
 return 0;
}
//*********************************************************
int CVICALLBACK stop (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
   SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 0); // 禁止定时器的运行
   break;
 }
 return 0;
}
//*********************************************************
//*********************************************************
//*********************************************************