VC知识库BLOG-龙仪的家-代码库之四

代码库之四－多事件

多事件类
在线程中经常要等待多个事件，每次创建很多事件很繁琐，所以写了这个类
你可以为按照事件序号为每个事件定义枚举，这样使用的时候很方便。这个代码能帮到你我很高兴，有什么问题请告诉我。
//////////////////////////////////H////////////////////////////////////////////////////////////
#ifndef LGLIB_MULTIEVENT_H
#define LGLIB_MULTIEVENT_H

namespace lglib
{
class __LGLIB__ lg_MultiEvent
{
public:
  lg_MultiEvent(uint16 count);
  virtual ~lg_MultiEvent();
public:
  void resetall();
  BOOL reset( uint16 npos);

  void setall();
  BOOL set( uint16 npos);

  int32 wait( BOOL bWaitAll = FALSE );
  int32 wait( uint32 timeout , BOOL bWaitAll = FALSE );

  uint16 GetEventCount() const;

private:
  uint16 m_EventCount;
  HANDLE *m_hCond;
};
}
#endif

///////////////////////////////////CPP//////////////////////////////////////////////////////////

namespace lglib
{
lg_MultiEvent::lg_MultiEvent(uint16 count)
{
  //////////////////////////////////////////////////////////////////////////
  //MAXIMUM_WAIT_OBJECTS = 64
  //WaitForMultipleObjects 最多能等待 64个事件，所以事件的定义不能超过64
  //////////////////////////////////////////////////////////////////////////
  m_EventCount = (count > 64 ) ? 64 : count;

  m_hCond = new HANDLE[count];

  for( uint16 i = 0; i < m_EventCount ; i++)
  {
   m_hCond[i] = CreateEvent(NULL,TRUE,FALSE,NULL);
  }
}

lg_MultiEvent::~lg_MultiEvent()
{
  for(uint16 i = 0;i < m_EventCount;i++)
  {
   CloseHandle(m_hCond[i]);
  }

  delete [] m_hCond;
}
void lg_MultiEvent::resetall()
{
  for(int16 i = 0; i < m_EventCount; i++)
  {
   reset(i);
  }
}
BOOL lg_MultiEvent::reset( uint16 npos )
{
  if(npos >= m_EventCount)
   return FALSE;

  ::ResetEvent( m_hCond[npos] );

  return TRUE;
}
void lg_MultiEvent::setall()
{
  for(uint16 i = 0;i < m_EventCount; i++)
  {
   set(i);
  }
}

BOOL lg_MultiEvent::set( uint16 npos)
{
if(npos >= m_EventCount)
return FALSE;

::SetEvent( m_hCond[npos] );

return TRUE;
}

int32 lg_MultiEvent::wait( BOOL bWaitAll )
{
uint32 Ret = ::WaitForMultipleObjects(m_EventCount, m_hCond, bWaitAll,INFINITE );

  if(Ret < (WAIT_OBJECT_0 + m_EventCount))
   return (Ret - WAIT_OBJECT_0);

  return -1;
}
int32 lg_MultiEvent::wait( uint32 timeout , BOOL bWaitAll)
{
  uint32 Ret = WaitForMultipleObjects(m_EventCount, m_hCond, bWaitAll, timeout );

  if(Ret < (WAIT_OBJECT_0 + m_EventCount))
   return (Ret - WAIT_OBJECT_0);
  return -1;
}
uint16 lg_MultiEvent::GetEventCount() const
{
  return m_EventCount;
}
}