GPSID: GPS data in unattended power mode on WM6 device
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From: Kevin FL on 5 Oct 2008 07:43 Roger - did you ever figure out anything on this? "Roger Vincent" wrote: > We found that on WM5 devices when we went into unattended mode we had to > issue a IOCTL_SERVICE_STOP / IOCTL_SERVICE_START to get GPS going again as it > stoped as soon as we went into unattended mode. > > On WM6 devices we get an error (device is an O2 XDA Orbit 2 aka HTC Polaris > aka HTC Touch Cruise). The last error value after the DeviceIoControl call > is 4319 'device not ready for use'. > > relevant .NET code snippet with PInvoke declarations as follows (this gets > called when we get notified that the device has entered the unattended power > state): > > [DllImport("coredll", SetLastError = true)] > static extern IntPtr CreateFile(String lpFileName, > [MarshalAs(UnmanagedType.U4)]FileAccess fileaccess, > [MarshalAs(UnmanagedType.U4)]FileShare fileshare, IntPtr > lpSecurityAttributes, [MarshalAs(UnmanagedType.U4)]FileMode > creationdisposition, UInt32 dwFlagsAndAttributes, IntPtr hTemplateFile); > > [DllImport("coredll.dll", EntryPoint = "DeviceIoControl", > SetLastError = true)] > internal static extern int DeviceIoControlCE( > IntPtr hDevice, > uint dwIoControlCode, > IntPtr lpInBuffer, > int nInBufferSize, > IntPtr lpOutBuffer, > int nOutBufferSize, > ref int lpBytesReturned, > IntPtr lpOverlapped); > > [DllImport("coredll", SetLastError = false)] > static extern ulong GetLastError(); > > > [DllImport("coredll.dll", SetLastError = true, CallingConvention = > CallingConvention.Winapi, CharSet = CharSet.Auto)] > [return: MarshalAs(UnmanagedType.Bool)] > public static extern bool CloseHandle(IntPtr hObject); > > public const uint IOCTL_SERVICE_START = 0x41000004; > public const uint IOCTL_SERVICE_STOP = 0x41000008; > public const uint IOCTL_SERVICE_REFRESH = 0x4100000C; > public const uint IOCTL_SERVICE_STATUS = 0x41000020; > > IntPtr deviceHandle = CreateFile("GPD0:", FileAccess.Read, > FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero); > int numBytesReturned = 0; > int result = 0; > int lastError = 0; > result = DeviceIoControlCE(deviceHandle, IOCTL_SERVICE_STOP, > IntPtr.Zero, 0, IntPtr.Zero, 0, ref numBytesReturned, > IntPtr.Zero); > if(result==0) > { > lastError = Marshal.GetLastWin32Error(); > } > Thread.Sleep(5000); > result = DeviceIoControlCE(deviceHandle, IOCTL_SERVICE_START, > IntPtr.Zero, 0, IntPtr.Zero, 0, ref numBytesReturned, > IntPtr.Zero); > if (result == 0) > { > lastError = Marshal.GetLastWin32Error(); > } > > We've also tried a call to SetPowerRequirement on GPD0: with > DevicePowerState DO prior to the CreateFile on GPD0: and that seems to have > the effect of changing the Win32 error code to 21 "The device is not ready.", > rather than 4319 "The device is not ready for use. " > > Any thoughts, suggestions, or especially fixes are welcome.
From: Roger Vincent on 6 Oct 2008 07:30 Hi Kevin, We haven't yet found a solution to this. I've had a suggestion that calling SetPowerRequirement may help but this does not seem to resolve the problem. "Kevin FL" wrote: > Roger - did you ever figure out anything on this? > > "Roger Vincent" wrote: > > > We found that on WM5 devices when we went into unattended mode we had to > > issue a IOCTL_SERVICE_STOP / IOCTL_SERVICE_START to get GPS going again as it > > stoped as soon as we went into unattended mode. > > > > On WM6 devices we get an error (device is an O2 XDA Orbit 2 aka HTC Polaris > > aka HTC Touch Cruise). The last error value after the DeviceIoControl call > > is 4319 'device not ready for use'. > > > > relevant .NET code snippet with PInvoke declarations as follows (this gets > > called when we get notified that the device has entered the unattended power > > state): > > > > [DllImport("coredll", SetLastError = true)] > > static extern IntPtr CreateFile(String lpFileName, > > [MarshalAs(UnmanagedType.U4)]FileAccess fileaccess, > > [MarshalAs(UnmanagedType.U4)]FileShare fileshare, IntPtr > > lpSecurityAttributes, [MarshalAs(UnmanagedType.U4)]FileMode > > creationdisposition, UInt32 dwFlagsAndAttributes, IntPtr hTemplateFile); > > > > [DllImport("coredll.dll", EntryPoint = "DeviceIoControl", > > SetLastError = true)] > > internal static extern int DeviceIoControlCE( > > IntPtr hDevice, > > uint dwIoControlCode, > > IntPtr lpInBuffer, > > int nInBufferSize, > > IntPtr lpOutBuffer, > > int nOutBufferSize, > > ref int lpBytesReturned, > > IntPtr lpOverlapped); > > > > [DllImport("coredll", SetLastError = false)] > > static extern ulong GetLastError(); > > > > > > [DllImport("coredll.dll", SetLastError = true, CallingConvention = > > CallingConvention.Winapi, CharSet = CharSet.Auto)] > > [return: MarshalAs(UnmanagedType.Bool)] > > public static extern bool CloseHandle(IntPtr hObject); > > > > public const uint IOCTL_SERVICE_START = 0x41000004; > > public const uint IOCTL_SERVICE_STOP = 0x41000008; > > public const uint IOCTL_SERVICE_REFRESH = 0x4100000C; > > public const uint IOCTL_SERVICE_STATUS = 0x41000020; > > > > IntPtr deviceHandle = CreateFile("GPD0:", FileAccess.Read, > > FileShare.ReadWrite, IntPtr.Zero, FileMode.Open, 0, IntPtr.Zero); > > int numBytesReturned = 0; > > int result = 0; > > int lastError = 0; > > result = DeviceIoControlCE(deviceHandle, IOCTL_SERVICE_STOP, > > IntPtr.Zero, 0, IntPtr.Zero, 0, ref numBytesReturned, > > IntPtr.Zero); > > if(result==0) > > { > > lastError = Marshal.GetLastWin32Error(); > > } > > Thread.Sleep(5000); > > result = DeviceIoControlCE(deviceHandle, IOCTL_SERVICE_START, > > IntPtr.Zero, 0, IntPtr.Zero, 0, ref numBytesReturned, > > IntPtr.Zero); > > if (result == 0) > > { > > lastError = Marshal.GetLastWin32Error(); > > } > > > > We've also tried a call to SetPowerRequirement on GPD0: with > > DevicePowerState DO prior to the CreateFile on GPD0: and that seems to have > > the effect of changing the Win32 error code to 21 "The device is not ready.", > > rather than 4319 "The device is not ready for use. " > > > > Any thoughts, suggestions, or especially fixes are welcome.
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