vc++ 监控指定路径下文件变化实现代码
参考MSDN文档
https://docs.microsoft.com/zh-cn/windows/desktop/api/winbase/nf-winbase-readdirectorychangesw
https://docs.microsoft.com/zh-cn/windows/desktop/api/winnt/ns-winnt-_file_notify_information
具体看代码
#include#include #include #include #include usingnamespacestd; typedefvoid(*CHANGESCALLBACK)(conststd::wstringstrFileName); /* @监控指定目录下文件变化 @strDirPath需要监控的目录 @dwChangesType需要监控文件变化方式 @onCallBack变化后的回调处理函数 */ voidCheckFilesChanges(conststd::wstringstrDirPath,DWORDdwChangesType,CHANGESCALLBACKonCallBack); voidPrintMsg(conststd::wstringstrFileName){ wprintf_s(L"newaddFile:\t%s\r\n",strFileName.c_str()); } voidCheckFilesChanges(conststd::wstringstrDirPath,DWORDdwChangesType,CHANGESCALLBACKonCallBack){ if(strDirPath.empty()||!onCallBack) return; HANDLEhDir=INVALID_HANDLE_VALUE; BYTElpBuffer[1024]; ZeroMemory(lpBuffer,1024); DWORDcbBytes=NULL; BOOLisOk=FALSE; FILE_NOTIFY_INFORMATION*pnotify=(FILE_NOTIFY_INFORMATION*)lpBuffer; FILE_NOTIFY_INFORMATION*tmp; ZeroMemory(&lpBuffer,sizeof(FILE_NOTIFY_INFORMATION)); hDir=CreateFile(strDirPath.c_str(),FILE_LIST_DIRECTORY, FILE_SHARE_READ| FILE_SHARE_WRITE| FILE_SHARE_DELETE,NULL, OPEN_EXISTING,FILE_FLAG_BACKUP_SEMANTICS| FILE_FLAG_OVERLAPPED,NULL); if(INVALID_HANDLE_VALUE==hDir) return; while(true){ isOk=ReadDirectoryChangesW(hDir,&lpBuffer, sizeof(lpBuffer), TRUE, FILE_NOTIFY_CHANGE_FILE_NAME|FILE_NOTIFY_CHANGE_LAST_WRITE, &cbBytes, NULL, NULL); if(isOk){ tmp=pnotify; PWSTRfileName=nullptr; std::wstringstrFileName; if(tmp->FileNameLength){ DWORDdwLength=tmp->FileNameLength+1; fileName=newwchar_t[dwLength]; if(fileName){ memset(fileName,0,dwLength*2); memcpy(fileName,tmp->FileName,dwLength*2); strFileName=fileName; } if(fileName) delete[]fileName; } if(tmp->Action==dwChangesType){ onCallBack(strFileName); } ZeroMemory(tmp,1024); /*switch(tmp->Action){ caseFILE_ACTION_ADDED://当前目录新增文件{ onCallBack(strFileName); }break; caseFILE_ACTION_REMOVED://该文件已从目录中删除{ onCallBack(strFileName); } break; caseFILE_ACTION_MODIFIED://该文件已被修改。也可以是时间戳或属性的更改{ onCallBack(strFileName); } break; caseFILE_ACTION_RENAMED_OLD_NAME://该文件已重命名，这是旧名称。{ onCallBack(strFileName); } break; caseFILE_ACTION_RENAMED_NEW_NAME://该文件已重命名，这是新名称。{ onCallBack(strFileName); } break; default: break; }*/ } } CloseHandle(hDir); } unsignedintCALLBACKThreadProc(void*arg){ CheckFilesChanges(_T("E:\\GoCode"),FILE_ACTION_ADDED,PrintMsg); return0; } intmain(intargc,char*argv[]){ HANDLEhThread=NULL; hThread=(HANDLE)::_beginthreadex(nullptr,NULL,ThreadProc,NULL,NULL,NULL); system("pause"); return0; }
好了这篇文章就介绍到这了，需要的朋友可以参考一下。