Question

我有一些代码用于更新设备在进入睡眠状态之前等待的时间。

我更新了注册表，然后尝试告诉操作系统重新加载该值，但它无法正常工作。（重新加载部分不起作用。注册表更新正常。）

我将发布我的代码，希望有人知道我做错了什么：

// Change the amount of seconds that the OS will wait before it goes to sleep.
public void ChangeBatteryTimeout(int timeoutInSeconds)
{
    // Attempt to open the key
    RegistryKey key = Registry.LocalMachine.OpenSubKey("SYSTEM\\CurrentControlSet\\Control\\Power\\Timeouts", true) ??
                      // If the return value is null, the key doesn't exist, so create it.
                      Registry.LocalMachine.CreateSubKey("SYSTEM\\CurrentControlSet\\Control\\Power\\Timeouts");

    if (key == null)
        throw new KeyNotFoundException("Could not find or make the key for timeout manangment.");

    // This value must be set for the timeout stuff to work.  
    //  See:http://msdn.microsoft.com/en-us/library/aa932196.aspx
    if (key.GetValue("ACUserIdle") == null)
        key.SetValue("ACUserIdle", 0, RegistryValueKind.DWord);

    // Set the Battery Suspend Timeout to be the passed in value.
    key.SetValue("BattSuspendTimeout", timeoutInSeconds, RegistryValueKind.DWord); 

    // Signal the OS to reload the value we just changed.
    DoAutoResetEvent();
}

// Tell to OS to reload the timeouts.
private static void DoAutoResetEvent()
{
    const string eventString = "PowerManager/ReloadActivityTimeouts";
    IntPtr newHandle = CreateEvent(IntPtr.Zero, false, false, eventString);
    EventModify(newHandle, (int)EventFlags.EVENT_SET);
    CloseHandle(newHandle); 
}


private enum EventFlags
{
    EVENT_PULSE = 1,EVENT_RESET = 2,EVENT_SET = 3
}

[DllImport("coredll.dll", SetLastError = true)]
private static extern IntPtr CreateEvent(IntPtr lpEventAttributes, 
    bool bManualReset, bool bInitialState, string lpName);

[DllImport("coredll")]
static extern bool EventModify(IntPtr hEvent, int func);

[DllImport("coredll.dll", SetLastError = true)]
private static extern bool CloseHandle(IntPtr hObject);

我用ChangeBatteryTimeout(10);调用它，但是，当注册表更改时，设备不会在10秒内休眠。（它需要先前设定的值190秒。）

任何帮助都将不胜感激。

Answer 1

查看CE公共源代码中控制面板的源代码（您现在已经下载了Platform Builder，对吧？）。 IIRC在您进行更改时会广播WM_SETTINGCHANGE消息。

告诉操作系统从注册表重新加载电源超时值

1 个答案: