出處:http://blog.sina.com.cn/s/blog_6c617ee30100u943.html

#include <afx.h>//send.cpp
#include <iostream>
#include <windows.h>
#include <process.h>
#include <string.h>
using namespace std;

HANDLE g_hCommDev=0;//串列埠控制代碼
HANDLE g_hEvent=0;
char filename[MAX_PATH];//檔名
char *wbuff;//指向輸出緩衝區，後面new
FILE *wf;
DWORD z=0;//檔案大小
void DiretorySearch(const char *dirPath);
void CommWatchProc(LPVOID pParam);
void CommLive(LPVOID pParam);
bool SetupSynCom()
{
 DCB dcb;
 COMMTIMEOUTS timeouts;
 if((g_hCommDev=CreateFile("COM1",GENERIC_WRITE,
  0,NULL,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,NULL))
  ==INVALID_HANDLE_VALUE)
  return false;
 timeouts.ReadIntervalTimeout=1000;
 timeouts.ReadTotalTimeoutConstant=1000;
 timeouts.ReadTotalTimeoutMultiplier=1000;
 timeouts.WriteTotalTimeoutConstant=1000;
 timeouts.WriteTotalTimeoutMultiplier=1000;
 SetCommTimeouts(g_hCommDev,&timeouts);
 SetupComm(g_hCommDev,1,102400);
 GetCommState(g_hCommDev,&dcb);
 dcb.BaudRate=CBR_115200 ;
 dcb.fParity=NOPARITY;
 dcb.ByteSize=8;
 dcb.StopBits=ONESTOPBIT;

 dcb.fOutxCtsFlow=true;
 dcb.fRtsControl=1;
SetCommState(g_hCommDev,&dcb);
 
 g_hEvent=CreateEvent(NULL,FALSE,true,"WatchEvevt");
 
 char pathName[MAX_PATH];
   char szPathTemp[MAX_PATH];
  GetModuleFileName(NULL, szPathTemp, MAX_PATH);
  for (int i=strlen(szPathTemp); i>=0; i--)
  {  
   if (szPathTemp[i] == '\\')
   {
    break;
   
   }
    szPathTemp[i]='\0';
  }
strcat(szPathTemp,"liuhansend.ini");
 CString myhere;
 ::GetPrivateProfileString("StudentInfo","Name",NULL,myhere.GetBuffer(MAX_PATH),MAX_PATH,szPathTemp);
 strcpy(pathName,myhere);
 cout<<"檔案目錄位於:"<<pathName<<endl;
 cout<<"配置檔案位於"<<szPathTemp<<endl;
 _beginthread(&CommWatchProc,0,pathName);
 _beginthread(&CommLive,0,NULL);
 return true;
}

bool WriteComm(char *lpSneBuffer,DWORD dwBytesToWrite)
{
 bool bWriteState;
 DWORD dwBytesWritten=0;
 bWriteState=WriteFile(g_hCommDev,lpSneBuffer,dwBytesToWrite,
    &dwBytesWritten,NULL);
 z=z-(int)dwBytesWritten;
 cout<<"傳送了"<<dwBytesWritten<<"位元組資料,本次還剩"<<z<<"位元組資料沒有傳送\n";
 if(!bWriteState || dwBytesWritten!=dwBytesToWrite)
 {
  cout<<"\n\n傳送失敗！"<<endl;
  Sleep(-1);
  return false;
 }
 else return true;
}
void CloseSynComm()
{

 SetCommMask(g_hCommDev,0);
 //WaitForSingleObject(hEvent,INFINITE);
 //CloseHandle(hEvent);
 PurgeComm(g_hCommDev,PURGE_TXCLEAR|PURGE_RXCLEAR);
 //CloseHandle(g_hCommDev);
}
void CommWatchProc(LPVOID pParam)
{
 char *p=(char *)pParam;
 wbuff=new char[102400];
 while(true)
 {

 DiretorySearch(p); 

 }
 delete wbuff;
}

void CommLive(LPVOID pParam)
{

 while(true){
 DWORD CTSUP=0;
 GetCommModemStatus(g_hCommDev,&CTSUP);
 if((CTSUP & MS_CTS_ON) != MS_CTS_ON)
 {
  cout<<"請檢查串列埠線是否插好！\n";
  int i=0;
  for(;i<10;i++)
  { CTSUP=0;
   GetCommModemStatus(g_hCommDev,&CTSUP);
   if((CTSUP & MS_CTS_ON) != MS_CTS_ON)
   { 
    Sleep(1000);
   }
   else break;
  }
  if(i>9)
  {
   cout<<"等待超時，請重啟兩邊程式！\n";
   exit(0);
  }

 }
 else {
   Sleep(3000);
 }
 }
}

 //遞迴遍歷指定資料夾下的所有資料夾和檔案
 void DiretorySearch(const char *dirPath)
 { 

  WIN32_FIND_DATAA lpFindFileData;  
  char dirPathTemp[MAX_PATH];
  char dirCodeTemp[MAX_PATH];
  strcpy(dirPathTemp, dirPath);
  strcpy(dirCodeTemp, dirPath);
  const char *pChar = strrchr(dirPath, '\\');
  if(pChar != NULL && strlen(pChar) == 1)
   strcat(dirCodeTemp, "*");
    else
   {
   strcat(dirCodeTemp, "\\*");
   strcat(dirPathTemp, "\");
   }
  
  HANDLE handle = FindFirstFileA(dirCodeTemp, &lpFindFileData);
 if(handle == INVALID_HANDLE_VALUE)
  {
   cout<<dirPathTemp<<"檢索失敗!"<<endl;
   return;
  }
  
 if((lpFindFileData.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY) == 0) //判斷檔案屬性
 {
  ZeroMemory(filename,MAX_PATH);
  strcpy(filename,dirPathTemp);
  int filelong=(lpFindFileData.nFileSizeHigh * (MAXDWORD+1) + lpFindFileData.nFileSizeLow);
  filename[strlen(filename)]='?';//檔名結束符，後面新增檔案大小，好一起傳輸
  sprintf((filename+strlen(filename)),"%d",filelong);
  
  if(filelong==0)
  {
   if(remove(dirPathTemp)==0)    
    cout<<dirPathTemp<<"為空檔案，直接刪除了\n\n";
   
  }
  else{
   
   DWORD dwBytesWritten1=0;
   WriteFile(g_hCommDev,filename,MAX_PATH,
    &dwBytesWritten1,NULL);
   PurgeComm(g_hCommDev,PURGE_TXCLEAR|PURGE_RXCLEAR);//清空緩衝區
   Sleep(50);
   cout<<"準備傳出檔案:"<<filename<<endl;
   wf=fopen(dirPathTemp,"rb+");   
   z=filelong;
   ZeroMemory(wbuff,102400);
   if(z<=102400)
   {
    if(z>0)
    {
     fread(wbuff,z,1,wf);
     WriteComm(wbuff,z);
    }
    
   }
   else{
    fread(wbuff,102400,1,wf);
    WriteComm(wbuff,102400);
    
    
    while(true)
    {
     ZeroMemory(wbuff,102400);
     
     if(z<=102400)
     {
      if(z>0)
      {
       fread(wbuff,z,1,wf);
       WriteComm(wbuff,z);
      }
      break;
     }
     else{