原创 Labwindows/cvi8.5学习日志(25)----RS232与电子天平的通讯

//*********************************************************
// Labwindows/cvi8.5 RS232与电子天平的通讯
// szlihongtao           
// 2010-06-20
// 参照 王建新的<Labwindows/cvi测试技术及工程应用> page189
// 稍有改写
//*********************************************************
#include <userint.h>
#include <rs232.h>
#include <utility.h>
#include <ansi_c.h>
#include <formatio.h>
#include "RS232实例.h"
//*********************************************************
static int panelHandle; 
static int ComPort = 1;
static void *callbackdata;
void ComCallback(int COMport, int eventMask, void *callbackdata); 
//*********************************************************
int main (int argc, char *argv[])
{
 if (InitCVIRTE (0, argv, 0) == 0)
  return -1; /* out of memory */
 if ((panelHandle = LoadPanel (0, "RS232实例.uir", PANEL)) < 0)
  return -1;
 DisplayPanel (panelHandle);
            
 OpenComConfig (ComPort, "", 9600, 0, 8, 1, 32767, 32767);   //打开并配置串口
 RunUserInterface ();
 DiscardPanel (panelHandle);
 return 0;
}
//*********************************************************
int CVICALLBACK rs232quit (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {            
  case EVENT_COMMIT:
  {
   SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 0);
   CloseCom (ComPort);
   QuitUserInterface (0);
   break;
  }
 }
 return 0;
}
//*********************************************************
int CVICALLBACK rs232receive (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 switch (event)
 {
  case EVENT_COMMIT:
  {
   //给串口Com1安装指定的回调函数，当输入队列满50个字符时产生中断
   InstallComCallback (ComPort, LWRS_RECEIVE, 50, 0, ComCallback, 0);
   
   //设置Timer的Enable属性为1，开始计时
   SetCtrlAttribute (panelHandle, PANEL_TIMER, ATTR_ENABLED, 1); 
   SetCtrlAttribute (panelHandle, PANEL_CMD_232_RECEIVE, ATTR_DIMMED, 1);  
   break;
  }
 }          
 return 0;
}   
//*********************************************************
//将接收到的数据储存在指定文件中
//*********************************************************
int CVICALLBACK timerweight (int panel, int control, int event,
  void *callbackData, int eventData1, int eventData2)
{
 char *time;
 char *date;
 char filename[260];
 char value[256];
 char weigh[20];
 double weightvlaue;
 int FileHandle;
 
 switch (event)
 {
  case EVENT_TIMER_TICK:
  {  
   date="\0";       //初始化指针  
   time="\0";    
   date = DateStr ();    //获得系统当前时间和日期
   time = TimeStr ();
   
   filename[0]=0;      //初始化指针       
   //GetProjectDir (filename);  //以下代码为创建一个文件路径  
   //strcat (filename, "\\");
   strcat (filename, date);
   strcat (filename, "-");
   strcat (filename, "weight.txt");
   
   //获得天平重量值
      GetCtrlVal (panelHandle, PANEL_NUMERICGAUGE, &weightvlaue);
   Fmt(weigh,"%s<%f  ", weightvlaue);
        
   strcpy(value,date);  
   strcat(value,"  ");
   strcat(value,time);
   strcat(value,"  ");  
   strcat(value,weigh);
   
   //将文本内容加上换行与回车
   strcat (value, "\r\n");  // 注意这句话，已经修正，原来的程序有误      
   strcat (value, "\r\n");  // 注意这句话，已经修正，原来的程序有误      
             
   //写入到文件中  
   FileHandle = OpenFile (filename, VAL_READ_WRITE, VAL_APPEND, VAL_BINARY);
   WriteFile (FileHandle,value ,strlen (value) );
   CloseFile (FileHandle);  
   break;
  }
 }
 return 0;
}
//*********************************************************
//Com1端口中断回调函数
//*********************************************************
void ComCallback(int COMport, int eventMask, void *callbackdata)
{
 int inputqueuelength;
 int bytesread;
 char buffer[512];
 char *matchedchar = 0;
 double value;
 int i;
         
 inputqueuelength = GetInQLen (ComPort);    //获得指定端口输入队列字符数
 bytesread = ComRd (ComPort, buffer, inputqueuelength);  //读取输入队列中字符串     
 for (i = 0; i <= bytesread; i ++)
 {
  //当字符为"+"（0x2B）时，执行以下代码
  if (buffer == 0x2B)
  {
   //将matchedchar的指针对准字符"+"的下一位，即指向接收的数据
   matchedchar = buffer + i + 1;
   
   //将字符串格式数据转化为双精度格式
   Fmt (&value, "%f<%s", matchedchar);
   SetCtrlVal (panelHandle, PANEL_NUMERICGAUGE, value);
             
   FlushInQ (ComPort);    //清空指定端口的输入队列  
  }
  break;
 } 
}
//*********************************************************
//*********************************************************
//*********************************************************