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| #include <windows.h>
#include <tchar.h>
#include <stdio.h>
//void main(int argc, char *argv[])
void __cdecl _tmain(int argc, TCHAR *argv[])
{
DWORD dwFilter = REG_NOTIFY_CHANGE_NAME |
REG_NOTIFY_CHANGE_ATTRIBUTES |
REG_NOTIFY_CHANGE_LAST_SET |
REG_NOTIFY_CHANGE_SECURITY;
HANDLE hEvent;
HKEY hMainKey;
HKEY hKey;
LONG lErrorCode;
// Display the usage error message.
if (argc != 3)
{
_tprintf(TEXT("Usage: notify [HKLM|HKU|HKCU|HKCR|HCC] [<subkey>]\n"));
return;
}
// Convert parameters to appropriate handles.
if (_tcscmp(TEXT("HKLM"), argv[1]) == 0) hMainKey=HKEY_LOCAL_MACHINE;
else if(_tcscmp(TEXT("HKU"), argv[1]) == 0) hMainKey=HKEY_USERS;
else if(_tcscmp(TEXT("HKCU"), argv[1]) == 0) hMainKey=HKEY_CURRENT_USER;
else if(_tcscmp(TEXT("HKCR"), argv[1]) == 0) hMainKey=HKEY_CLASSES_ROOT;
else if(_tcscmp(TEXT("HCC"), argv[1]) == 0) hMainKey=HKEY_CURRENT_CONFIG;
else
{
_tprintf(TEXT("Usage: notify [HKLM|HKU|HKCU|HKCR|HCC] [<subkey>]\n"));
return;
}
// Open a key.
lErrorCode = RegOpenKeyEx(hMainKey, argv[2], 0, KEY_NOTIFY, &hKey);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegOpenKeyEx (%d).\n"), lErrorCode);
return;
}
// Create an event.
hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
if (hEvent == NULL)
{
_tprintf(TEXT("Error in CreateEvent (%d).\n"), GetLastError());
return;
}
// Watch the registry key for a change of value.
lErrorCode = RegNotifyChangeKeyValue(hKey,
TRUE,
dwFilter,
hEvent,
TRUE);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegNotifyChangeKeyValue (%d).\n"), lErrorCode);
return;
}
// Wait for an event to occur.
_tprintf(TEXT("Waiting for a change in the specified key...\n"));
if (WaitForSingleObject(hEvent, INFINITE) == WAIT_FAILED)
{
_tprintf(TEXT("Error in WaitForSingleObject (%d).\n"), GetLastError());
return;
}
else _tprintf(TEXT("\nChange has occurred.\n"));
// Close the key.
lErrorCode = RegCloseKey(hKey);
if (lErrorCode != ERROR_SUCCESS)
{
_tprintf(TEXT("Error in RegCloseKey (%d).\n"), GetLastError());
return;
}
// Close the handle.
if (!CloseHandle(hEvent))
{
_tprintf(TEXT("Error in CloseHandle.\n"));
return;
}
}
|