重启PPC或smartphone调用ExitWindowsEx的问题-优快云博客

本文介绍在不同版本的Windows Mobile操作系统上实现设备软重启的三种方法：通过KernelIoControl、SetSystemPowerState和ExitWindowsEx函数。针对不同的操作系统版本，提供了具体的代码示例。

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转自http://www.pocketpcdn.com/articles/articles.php?&atb.set(a_id)=3937&atb.set(c_id)=66&atb.perform(details)=&

以下是关于如何软启动Windows Mobile device。

关于软启动有三种方法：

1.调用KernelIoControl

(This approach was used in previous edition of this article but it has a number of disadvantages (implementing of this function is not required for OEMs and some old Pocket PC devices really miss this functionality, this function usually restricted so it could be used only in privileged mode ?now this is an issue only for Smartphones but not for Pocket PC and finally but most important buffers is not flushed so user could lost his data)

2.By SetSystemPowerState

3.使用ExitWindowsEx

第一种方法适用于老版本的Pocket PC，第二种适用于Windows Mobile 2003的操作系统，第三种方法适用于Windows Mobile 5.0以上的操作系统

code:

#include <winioctl.h>

void SoftReset();

extern "C" __declspec(dllimport) BOOL KernelIoControl(DWORD dwIoControlCode, LPVOID lpInBuf, DWORD nInBufSize, LPVOID lpOutBuf, DWORD nOutBufSize, LPDWORD lpBytesReturned);

static void ResetWithExitWindows()
{
HMODULE hModule = ::LoadLibrary(TEXT("aygshell.dll"));

typedef BOOL (*ExitWindowsExFunction)(UINT uFlags, DWORD dwReserved);

ExitWindowsExFunction f = (ExitWindowsExFunction)::GetProcAddress(hModule, TEXT("ExitWindowsEx"));

#ifndef EWX_REBOOT
#define EWX_REBOOT 2
#endif

f(EWX_REBOOT, 0);

FreeLibrary(hModule);

}

static void ResetWithSetSystemPowerState()
{
typedef DWORD (*SetSystemPowerStateFunction)(LPCWSTR pwsSystemState, DWORD StateFlags, DWORD Options);
HMODULE hModule = ::LoadLibrary(TEXT("Coredll.dll"));

SetSystemPowerStateFunction f = (SetSystemPowerStateFunction)
   ::GetProcAddress(hModule, TEXT("SetSystemPowerState"));

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

f(NULL, POWER_STATE_RESET, 0);
::FreeLibrary(hModule);
}

static void ResetWithKernelIoControl()
{
#ifndef IOCTL_HAL_REBOOT
#define IOCTL_HAL_REBOOT CTL_CODE(FILE_DEVICE_HAL, 15, METHOD_BUFFERED, FILE_ANY_ACCESS)
#endif

KernelIoControl(IOCTL_HAL_REBOOT, NULL, 0, NULL, 0, NULL);
}

void SoftReset()
{
OSVERSIONINFO vi;
memset(&vi, 0, sizeof(vi));
vi.dwOSVersionInfoSize = sizeof(vi);
VERIFY(GetVersionEx(&vi));
if (vi.dwMajorVersion >= 5) {
   ResetWithExitWindows();
} else if (vi.dwMajorVersion==4 && vi.dwMinorVersion>=20) {
   ResetWithSetSystemPowerState();
} else {
   ResetWithKernelIoControl();
}
}