J'ai une application qui doit surveiller les changements dans un répertoire particulier. J'utilise le code suivant, cependant quand je renomme un fichier par exemple, l'action FILE_ACTION_RENAMED_NEW_NAME
n'est pas déclenchée. En fait, le UNDISCOVERED ACTION
est déclenché ce qui entraîne un comportement inattendu? Qu'est-ce que je fais mal ici?C++ Surveillance filechange avec ReadDirectoryChangesW ne déclenche pas toutes les actions?
char Dir[] = "DIRPATH";
HANDLE hDir = CreateFile(
Dir,
FILE_LIST_DIRECTORY,
FILE_SHARE_WRITE | FILE_SHARE_READ | FILE_SHARE_DELETE,
NULL,
OPEN_EXISTING,
FILE_FLAG_BACKUP_SEMANTICS,
NULL);
int nCounter = 0;
FILE_NOTIFY_INFORMATION strFileNotifyInfo[1024];
FILE_NOTIFY_INFORMATION *fni = NULL;
while (TRUE)
{
//strFileNotifyInfo = NULL;
DWORD dwBytesReturned = 0;
if (ReadDirectoryChangesW(hDir, (LPVOID)&strFileNotifyInfo, sizeof(strFileNotifyInfo), TRUE, FILE_NOTIFY_CHANGE_FILE_NAME | FILE_NOTIFY_CHANGE_DIR_NAME | FILE_NOTIFY_CHANGE_LAST_WRITE, &dwBytesReturned, NULL, NULL) == 0)
{
Exit(GetLastErrorAsString());
}
else
{
char fileName[MAX_PATH] = "";
DWORD offset = 0;
do {
fni = (FILE_NOTIFY_INFORMATION*)(&strFileNotifyInfo[offset]);
int ret = ::WideCharToMultiByte(CP_ACP, 0, fni->FileName, fni->FileNameLength/sizeof(WCHAR), fileName, sizeof(fileName), NULL, NULL);
string Test = Dir;
Test += "\\";
Test += fileName;
switch (fni->Action) {
case FILE_ACTION_ADDED:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory added: " << Dir << "\\" << fileName << endl;
}
else {
cout << "File added: " << Dir << "\\" << fileName << endl;
}
break;
case FILE_ACTION_MODIFIED:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory modified: " << Dir << "\\" << fileName << endl;
}
else {
cout << "File modified: " << Dir << "\\" << fileName << endl;
}
break;
case FILE_ACTION_REMOVED:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory removed: " << Dir << "\\" << fileName << endl;
}
else {
cout << "File removed: " << Dir << "\\" << fileName << endl;
}
break;
case FILE_ACTION_RENAMED_NEW_NAME:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory renamend (NEW): " << Dir << "\\" << fileName << endl;
}
else {
cout << "File renamed (NEW): " << Dir << "\\" << fileName << endl;
}
break;
case FILE_ACTION_RENAMED_OLD_NAME:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory renamed (OLD): " << Dir << "\\" << fileName << endl;
}
else {
cout << "File renamed (OLD): " << Dir << "\\" << fileName << endl;
}
break;
default:
if (boost::filesystem::is_directory(Test)) {
cout << "Directory UNDISCOVERED ACTION: " << Dir << "\\" << fileName << endl;
}
else {
cout << "File UNDISCOVERED ACTION: " << Dir << "\\" << fileName << endl;
}
break;
}
::memset(fileName, '\0', sizeof(fileName));
offset += fni->NextEntryOffset;
}
while (fni->NextEntryOffset != 0);
cout << "Loop: " << nCounter++ << endl;
}
}
Certains exemple de sortie sur renommer un fichier de file.txt
à file2.txt
sur la carte nommée: MAP
:
File renamed (OLD): DIRPATH\MAP\file.txt
Directory UNDISCOVERED ACTION: DIRPATH
Loop: 0
Directory modified: DIRPATH\MAP
Loop: 1
avoir une lecture de The Old New Thing: https://blogs.msdn.microsoft.com/oldnewthing/20110812-00/?p=9913 –
Notez en particulier le paragraphe à la fin de l'article que Richard a lié à: 'ReadDirectoryChangesW' peut échouer avec' ERROR_NOTIFY_ENUM_DIR' si son tampon interne manque de place. Dans ce cas, vous pouvez revenir à une boucle 'FindFirstFile' /' FindNextFile'. –