在线程中监测文件夹的变化，并获得通知 【C++ Builder下例子】

线程的头文件和实现文件如下：

//---------------------------------------------------------------------------#ifndef Unit2H#define Unit2H//---------------------------------------------------------------------------#include <Classes.hpp>//---------------------------------------------------------------------------class TWorkThread : public TThread{ private: HANDLE hEvent;protected: void __fastcall Execute();public: __fastcall TWorkThread(bool CreateSuspended); __fastcall ~TWorkThread();};//---------------------------------------------------------------------------#endif  

 

 

//---------------------------------------------------------------------------#include <vcl.h>#pragma hdrstop#include "Unit2.h"#include "Unit1.h"#pragma package(smart_init)//---------------------------------------------------------------------------// Important: Methods and properties of objects in VCL can only be// used in a method called using Synchronize, for example://// Synchronize(UpdateCaption);//// where UpdateCaption could look like://// void __fastcall TWorkThread::UpdateCaption()// {// Form1->Caption = "Updated in a thread";// }//---------------------------------------------------------------------------__fastcall TWorkThread::TWorkThread(bool CreateSuspended) : TThread(true){ this->FreeOnTerminate = true; hEvent = FindFirstChangeNotification( frmMain->sPath.c_str(), TRUE, FILE_NOTIFY_CHANGE_SIZE | FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE ); if(hEvent == INVALID_HANDLE_VALUE) { this->Terminate(); }}//---------------------------------------------------------------------------__fastcall TWorkThread::~TWorkThread(){ FindCloseChangeNotification(hEvent); }//---------------------------------------------------------------------------void __fastcall TWorkThread::Execute(){ //---- Place thread code here ---- do { // hEvent为文件改变事件 // 等待hEvent被设定为信号态 WaitForSingleObject(hEvent, INFINITE); // 对变更文件进行处理或提醒 Application->MessageBox("文件夹改变!", "提示", MB_OK + MB_ICONINFORMATION); FindNextChangeNotification(hEvent); } while(!Terminated);}//---------------------------------------------------------------------------