TestCommMonitor.c

 
#include <winpr/crt.h>
#include <winpr/comm.h>
#include <winpr/file.h>
#include <winpr/synch.h>
#include <winpr/handle.h>
 
int TestCommMonitor(int argc, char* argv[])
{
  HANDLE hComm = NULL;
  DWORD dwError = 0;
  BOOL fSuccess = 0;
  DWORD dwEvtMask = 0;
  OVERLAPPED overlapped = { 0 };
  LPCSTR lpFileName = "\\\\.\\COM1";
 
  hComm = CreateFileA(lpFileName, GENERIC_READ | GENERIC_WRITE, 0, NULL, OPEN_EXISTING,
                      FILE_FLAG_OVERLAPPED, NULL);
 
  if (!hComm || (hComm == INVALID_HANDLE_VALUE))
  {
    printf("CreateFileA failure: %s\n", lpFileName);
    return -1;
  }
 
  fSuccess = SetCommMask(hComm, EV_CTS | EV_DSR);
 
  if (!fSuccess)
  {
    printf("SetCommMask failure: GetLastError() = %" PRIu32 "\n", GetLastError());
    return -1;
  }
 
  if (!(overlapped.hEvent = CreateEvent(NULL, TRUE, FALSE, NULL)))
  {
    printf("CreateEvent failed: GetLastError() = %" PRIu32 "\n", GetLastError());
    return -1;
  }
 
  if (WaitCommEvent(hComm, &dwEvtMask, &overlapped))
  {
    if (dwEvtMask & EV_DSR)
    {
      printf("EV_DSR\n");
    }
 
    if (dwEvtMask & EV_CTS)
    {
      printf("EV_CTS\n");
    }
  }
  else
  {
    dwError = GetLastError();
 
    if (dwError == ERROR_IO_PENDING)
    {
      printf("ERROR_IO_PENDING\n");
    }
    else
    {
      printf("WaitCommEvent failure: GetLastError() = %" PRIu32 "\n", dwError);
      return -1;
    }
  }
 
  (void)CloseHandle(hComm);
 
  return 0;
}