WINCE重新启动

因为要在WINCE上面开发一个系统，监测数据。长时间运行下去容易导致死机。所以设定定时重启。认真分析与查阅相关资料后，发现下面几种方法：

一、使用SetSystemPowerState，通过测试后发现该方法重启的效果并不理想，有点像WINDOWS的注销而不是断电重启。

#ifndef POWER_STATE_RESET
#define POWER_STATE_RESET DWORD(0x00800000)
#endif

typedef BOOL (*SetSystemPowerState)(   
									LPCWSTR psState,
									DWORD StateFlags,
									DWORD Options
                                    );



//在函数中调用如下：
HINSTANCE hModule = LoadLibrary(_T("Coredll.dll"));
SetSystemPowerState f = (SetSystemPowerState)::GetProcAddress(hModule, TEXT("SetSystemPowerState"));
f(NULL, POWER_STATE_RESET, 0);
::FreeLibrary(hModule);

二、使用看门狗，因为看门狗必须定时喂食，所以我在调用时不给它喂食就会造成系统重启。我用的EMD9263的板子，重启代码如下：

#define AT91SAM9263_ENABLE_WATCHDOG			2400
#define AT91SAM9263_DISABLE_WATCHDOG		2401
#define AT91SAM9263_CLEAR_WATCHDOG			2402
#define FILE_DEVICE_DATALINK            0x00000005
#define METHOD_BUFFERED                 0
#define FILE_WRITE_ACCESS         ( 0x0002 )    // file & pipe
#define CTL_CODE( DeviceType, Function, Method, Access ) (                 \
	((DeviceType) << 16) | ((Access) << 14) | ((Function) << 2) | (Method) \
	)

#define IOCTL_ENABLE_WATCHDOG CTL_CODE(FILE_DEVICE_DATALINK, AT91SAM9263_ENABLE_WATCHDOG, METHOD_BUFFERED, FILE_WRITE_ACCESS)
#define IOCTL_DISABLE_WATCHDOG CTL_CODE(FILE_DEVICE_DATALINK, AT91SAM9263_DISABLE_WATCHDOG, METHOD_BUFFERED, FILE_WRITE_ACCESS)
#define IOCTL_CLEAR_WATCHDOG CTL_CODE(FILE_DEVICE_DATALINK, AT91SAM9263_CLEAR_WATCHDOG, METHOD_BUFFERED, FILE_WRITE_ACCESS)


//调用如下:
 HANDLE  hFileWatchdog= CreateFile(_T("DOG1:"), 
		                               GENERIC_READ | GENERIC_WRITE,
		                                0,
										NULL, 
										OPEN_EXISTING,
										FILE_ATTRIBUTE_NORMAL,
										NULL);
	if (hFileWatchdog != INVALID_HANDLE_VALUE)
	{
		DWORD dwReturn;
		BOOL ret=::DeviceIoControl(hFileWatchdog,IOCTL_ENABLE_WATCHDOG,NULL,0,NULL,0,&dwReturn,NULL);
		if(ret!=TRUE)
		{
			::CloseHandle(hFileWatchdog);
		}
	}	

在实际运用中，我用的是第二种方法。第一种方法可以适当使用。

@written by .cpp

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