注册表键要求双重删除

在使用RegDeleteKey函数删除注册表键时，如果该键的子项未被完全删除，则需要重新调用一次RegDeleteKey函数以删除未删除的子项。示例代码如下：

LONG DeleteKeyAndSubkeys(HKEY hKeyParent, LPCSTR lpszKeyChild) { HKEY hKeyChild; LONG lRes = RegOpenKeyEx(hKeyParent, lpszKeyChild, 0, KEY_ALL_ACCESS, &hKeyChild); if (lRes != ERROR_SUCCESS) { return lRes; }

TCHAR szBuffer[MAX_PATH];
DWORD dwSize = ARRAYSIZE(szBuffer);

// Enumerate child subkeys of KeyChild.
for (DWORD dwIndex = 0; ; dwIndex++)
{
    lRes = RegEnumKeyEx(hKeyChild, dwIndex, szBuffer, &dwSize, NULL, NULL, NULL, NULL);
    if (lRes == ERROR_NO_MORE_ITEMS)
    {
        break;
    }

    // Delete the child subkey.
    lRes = DeleteKeyAndSubkeys(hKeyChild, szBuffer);
    if (lRes != ERROR_SUCCESS)
    {
        RegCloseKey(hKeyChild);
        return lRes;
    }

    dwSize = ARRAYSIZE(szBuffer);
}

// Close the child key.
RegCloseKey(hKeyChild);

// Delete the current key.
return RegDeleteKey(hKeyParent, lpszKeyChild);

}