public void SuppressStandby()
{
// Clear current power request if there is any.
if (currentPowerRequest != IntPtr.Zero)
{
NativeAPIs.PowerClearRequest(currentPowerRequest, PowerRequestType.PowerRequestAwayModeRequired);
currentPowerRequest = IntPtr.Zero;
}
// Create new power request.
NativeAPIs.POWER_REQUEST_CONTEXT pContext;
pContext.Flags = NativeAPIs.POWER_REQUEST_CONTEXT_SIMPLE_STRING;
pContext.Version = NativeAPIs.POWER_REQUEST_CONTEXT_VERSION;
// This is the reason for standby suppression. It is shown when the command "powercfg -requests" is executed.
pContext.SimpleReasonString = "Standby suppressed by ButtonHandler.exe";
currentPowerRequest = NativeAPIs.PowerCreateRequest(ref pContext);
if (currentPowerRequest == IntPtr.Zero)
{
// Failed to create power request.
var error = Marshal.GetLastWin32Error();
if (error != 0)
{
throw new Win32Exception(error);
}
}
bool success = NativeAPIs.PowerSetRequest(currentPowerRequest, PowerRequestType.PowerRequestAwayModeRequired);
if (!success)
{
// Failed to set power request.
currentPowerRequest = IntPtr.Zero;
var error = Marshal.GetLastWin32Error();
if (error != 0)
{
throw new Win32Exception(error);
}
}
}
public void EnableStandby()
{
// Only try to clear power request if any power request is set.
if (currentPowerRequest != IntPtr.Zero)
{
var success = NativeAPIs.PowerClearRequest(currentPowerRequest, PowerRequestType.PowerRequestAwayModeRequired);
if (!success)
{
// Failed to clear power request.
currentPowerRequest = IntPtr.Zero;
var error = Marshal.GetLastWin32Error();
if (error != 0)
{
throw new Win32Exception(error);
}
}
else
{
currentPowerRequest = IntPtr.Zero;
}
}
}