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
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# include < iostream >
# include < windows.h >
# include < process.h >
# include < tchar.h >
# include < string >
using namespace std;
typedef void( * CHANGESCALLBACK)(const std::wstring strFileName);
/*
@ 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
*/
void CheckFilesChanges(const std::wstring strDirPath, DWORD dwChangesType, CHANGESCALLBACK onCallBack);
void PrintMsg(const std::wstring strFileName) {
wprintf_s(L "new add File:\t %s\r\n", strFileName.c_str());
}
void CheckFilesChanges(const std::wstring strDirPath, DWORD dwChangesType, CHANGESCALLBACK onCallBack) {
if (strDirPath.empty() || !onCallBack)
return;
HANDLE hDir = INVALID_HANDLE_VALUE;
BYTE lpBuffer[1024];
ZeroMemory(lpBuffer, 1024);
DWORD cbBytes = NULL;
BOOL isOk = 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;
PWSTR fileName = nullptr;
std::wstring strFileName;
if (tmp->FileNameLength) {
DWORD dwLength = tmp->FileNameLength + 1;
fileName = new wchar_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){
case FILE_ACTION_ADDED: //当前目录新增文件{
onCallBack(strFileName);
}break;
case FILE_ACTION_REMOVED: //该文件已从目录中删除{
onCallBack(strFileName);
}
break;
case FILE_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;
case FILE_ACTION_RENAMED_OLD_NAME: //该文件已重命名，这是旧名称。{
onCallBack(strFileName);
}
break;
case FILE_ACTION_RENAMED_NEW_NAME: //该文件已重命名，这是新名称。{
onCallBack(strFileName);
}
break;
default:
break;
}*/
}
}
CloseHandle(hDir);
}
unsigned int CALLBACK ThreadProc(void * arg) {
CheckFilesChanges(_T("E:\\GoCode"), FILE_ACTION_ADDED, PrintMsg);
return 0;
}
int main(int argc, char * argv[]) {
HANDLE hThread = NULL;
hThread = (HANDLE)::_beginthreadex(nullptr, NULL, ThreadProc, NULL, NULL, NULL);
system("pause");
return 0;
}
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好了这篇文章就介绍到这了，需要的朋友可以参考一下。
原文链接：https://www.cnblogs.com/guolongzheng/p/9969746.html