VC++檔案監控(一) ReadDirectoryChangesW
VC++實施檔案監控：例項和詳解
我這裡只介紹採用ReadDirectoryChangesW對檔案目錄實施監控
關鍵程式碼
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CfgdsgDlg * dlg = (CfgdsgDlg*)lparam;
HANDLE
hDir;
char
notify[1024];
DWORD
cbBytes,i;
char
AnsiChar[3];
wchar_t
UnicodeChar[2];
CString path;
FILE_NOTIFY_INFORMATION *pnotify=(FILE_NOTIFY_INFORMATION *)notify;
FILE_NOTIFY_INFORMATION *tmp;
GetCurrentDirectory(MAX_PATH,path.GetBuffer(MAX_PATH+1));
hDir = CreateFile( path, FILE_LIST_DIRECTORY,
FILE_SHARE_READ |
FILE_SHARE_WRITE |
FILE_SHARE_DELETE, NULL,
OPEN_EXISTING, FILE_FLAG_BACKUP_SEMANTICS |
FILE_FLAG_OVERLAPPED, NULL);
if
(hDir == INVALID_HANDLE_VALUE)
{
dlg->m_edit.ReplaceSel("hDir:INVALID_HANDLE_VALUE\r\n");
return
0;
}
while
(TRUE)
{
if(ReadDirectoryChangesW(hDir, ¬ify,
sizeof(notify),
FALSE, FILE_NOTIFY_CHANGE_FILE_NAME| FILE_NOTIFY_CHANGE_LAST_WRITE,
&cbBytes, NULL, NULL))
{
tmp = pnotify;
switch(tmp->Action)
{
case
FILE_ACTION_ADDED:
dlg->m_edit.ReplaceSel("Directory/File added （新增檔案）- \r\n");
break;
case
FILE_ACTION_REMOVED:
dlg->m_edit.ReplaceSel("Directory/File removed （刪除檔案）- \r\n");
break;
case
FILE_ACTION_MODIFIED:
dlg->m_edit.ReplaceSel("Directory/File modified （修改檔案內容）- \r\n");
break;
case
FILE_ACTION_RENAMED_OLD_NAME:
dlg->m_edit.ReplaceSel("Directory/File old name （修改檔名字）- \r\n");
break;
case
FILE_ACTION_RENAMED_NEW_NAME:
dlg->m_edit.ReplaceSel("Directory/File new name - \r\n");
break;
default:
break;
}
}
}
|
FILE_NOTIFY_INFORMATION //可以確定是那個檔案進行的修改
typedef struct _FILE_NOTIFY_INFORMATION {
DWORD NextEntryOffset;
DWORD Action;//動作
DWORD FileNameLength;//檔名字的長度
WCHAR FileName[1];//檔名字
} FILE_NOTIFY_INFORMATION,
*PFILE_NOTIFY_INFORMATION;
ReadDirectoryChangesW 返回型別(見MSDN)
| Value | Meaning |
|---|---|
|
FILE_ACTION_ADDED |
The file was added to the directory. |
|
FILE_ACTION_REMOVED |
The file was removed from the directory. |
|
FILE_ACTION_MODIFIED |
The file was modified. This can be a change in the time stamp or attributes. |
|
FILE_ACTION_RENAMED_OLD_NAME |
The file was renamed and this is the old name. |
|
FILE_ACTION_RENAMED_NEW_NAME |
The file was renamed and this is the new name. |
效果如下：
不足的地方:
只能檢測到指定目錄和下一級目錄，超過目錄級數，該函式檢測不到。