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    <p>My experience with GPS is that it takes a while to get a fix (at least on my device), so I think you have to keep the phone from suspended state all the time. When I’ve been playing around with my device I’ve noticed that I have to use the built in music player to get a fix while the screen is off. As ratchetr pointed out PowerPolicyNotify(PPN_UNATTENDEDMODE,TRUE) seems to be the right way to prevent the "music player requirement".</p> <p>Edit: It also seems like you have to use SetPowerRequirement / ReleasePowerRequirement on some devices.</p> <p>Here is a C# sample:</p> <pre><code> public const int PPN_UNATTENDEDMODE = 0x0003; public const int POWER_NAME = 0x00000001; public const int POWER_FORCE = 0x00001000; [DllImport("coredll.dll")] public static extern bool PowerPolicyNotify(int dwMessage, bool dwData); [DllImport("coredll.dll", SetLastError = true)] public static extern IntPtr SetPowerRequirement(string pvDevice, CedevicePowerStateState deviceState, uint deviceFlags, string pvSystemState, ulong stateFlags); [DllImport("coredll.dll", SetLastError = true)] public static extern int ReleasePowerRequirement(IntPtr hPowerReq); public enum CedevicePowerStateState : int { PwrDeviceUnspecified = -1, D0 = 0, D1, D2, D3, D4, } //Keep the GPS and device alive: PowerPolicyNotify(PPN_UNATTENDEDMODE, true) IntPtr gpsPowerHandle = SetPowerRequirement("gpd0:", CedevicePowerStateState.D0, POWER_NAME | POWER_FORCE, null, 0); //Call before exiting your app: ReleasePowerRequirement(gpsPowerHandle); PowerPolicyNotify(PPN_UNATTENDEDMODE, false); </code></pre>
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    1. COthe most clear answer over the web!!! it works great.. i noticed it keeps wifi on.
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