记录一下用到的C#在WinCE平台上的相关技巧备查
1。C#在WinCE上实现透明图片
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using System.Drawing.Imaging; public static void DrawImageTransparent(Graphics gx, Image image, Rectangle destRect) { ImageAttributes imageAttr = new ImageAttributes(); Color transpColor = ((Bitmap)image).GetPixel(image.Width - 1, image.Height - 1); imageAttr.SetColorKey(transpColor, transpColor); gx.DrawImage(image, destRect, 0, 0, image.Width, image.Height, GraphicsUnit.Pixel, imageAttr); } |
2。WinCE上播放声音文件
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public enum Flags { SND_SYNC = 0x0000, /* play synchronously (default) */ SND_ASYNC = 0x0001, /* play asynchronously */ SND_NODEFAULT = 0x0002, /* silence (!default) if sound not found */ SND_MEMORY = 0x0004, /* pszSound points to a memory file */ SND_LOOP = 0x0008, /* loop the sound until next sndPlaySound */ SND_NOSTOP = 0x0010, /* don't stop any currently playing sound */ SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */ SND_ALIAS = 0x00010000, /* name is a registry alias */ SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */ SND_FILENAME = 0x00020000, /* name is file name */ SND_RESOURCE = 0x00040004 /* name is resource name or atom */} [DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)] public extern static int WCE_PlaySound(string szSound, IntPtr hMod, int flags); /// <summary> /// 同步播放声音文件 /// </summary> /// <param name="filename"></param> public static void PlaySYNCSound(string filename) { if (!string.IsNullOrEmpty(filename)) { if (File.Exists(filename)) { WCE_PlaySound(filename, IntPtr.Zero, (int)(SendClass.Flags.SND_SYNC | SendClass.Flags.SND_FILENAME)); } } } /// <summary> /// 异步播放声音文件 /// </summary> /// <param name="filename"></param> public static void PlaySound(string filename) { if (!string.IsNullOrEmpty(filename)) { if (File.Exists(filename)) { WCE_PlaySound(filename, IntPtr.Zero, (int)(SendClass.Flags.SND_ASYNC | SendClass.Flags.SND_FILENAME)); } } } |
3。获取 / 设置WinCE系统音量
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/// <summary> /// 获取系统音量 /// </summary> /// <returns></returns> public static int GetVolume() { // By the default set the volume to 0 uint CurrVol = 0; // At this point, CurrVol gets assigned the volume SendClass.Common.waveOutGetVolume(IntPtr.Zero, ref CurrVol); // Calculate the volume ushort CalcVol = (ushort)(CurrVol & 0x0000ffff); // Get the volume on a scale of 1 to 20 (to fit the trackbar) return CalcVol / (ushort.MaxValue / 20); } /// <summary> /// 设置系统音量 /// </summary> /// <param name="value">要设置的音量值</param> public static void SetVolume(int value) { int volume = CalcVolumeValue(value); SendClass.Common.waveOutSetVolume(IntPtr.Zero, (uint)volume); RegistryKey hUSER = Registry.CurrentUser.OpenSubKey(@"ControlPanelVolume", true); hUSER.SetValue("Volume", volume, RegistryValueKind.DWord); hUSER.Flush(); hUSER.Close(); } private static int CalcVolumeValue(int value) { // Calculate the volume that's being set int NewVolume = (ushort.MaxValue * value / 20); // Set the same volume for both the left and the right channels return ((NewVolume & 0x0000ffff) | (NewVolume << 16)); } |
4。设定WinCE屏幕背光变暗的等待时间，以及唤醒屏幕背光
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public enum EventFlags { EVENT_PULSE = 1, EVENT_RESET = 2, EVENT_SET = 3 } [DllImport("coredll.dll")] public static extern IntPtr CreateEvent(IntPtr lpEventAttributes, bool bManualReset, bool bInitialState, String lpName); [DllImport("coredll.dll")] private static extern void EventModify(IntPtr h, int p); [DllImport("coredll.dll")] public static extern void CloseHandle(IntPtr h); public static void CreateChangeEvent(String EventName, bool bInitialState) { IntPtr hEvent = IntPtr.Zero; try { hEvent = CreateEvent(IntPtr.Zero, false, bInitialState, EventName); if (hEvent != IntPtr.Zero) { EventModify(hEvent, (int)EventFlags.EVENT_SET); } } catch { } finally { CloseHandle(hEvent); } } /// <summary> /// 设定背光超时时间 /// </summary> /// <param name="Seconds">背光超时时间（秒）</param> /// <param name="IsAC">设定交流供电还是电池供电</param> /// <returns></returns> public static bool SetBackLightTimeOut(int Seconds, bool IsAC) { Boolean returnvalue = false; try { using (RegistryKey key = Registry.CurrentUser.OpenSubKey("ControlPanel\Backlight", true)) { if (key != null) { if (IsAC) { key.SetValue("ACTimeout", Seconds, RegistryValueKind.DWord); key.SetValue("UseExt", 1, RegistryValueKind.DWord); } else { key.SetValue("BatteryTimeout", Seconds, RegistryValueKind.DWord); key.SetValue("UseBattery", 1, RegistryValueKind.DWord); } // 创建事件通知 CreateChangeEvent("BackLightChangeEvent", true); } else returnvalue = false; } } catch { returnvalue=false; } return returnvalue; } /// <summary> /// 如果屏幕背光是变暗的状态，则亮起屏幕背光 /// </summary> public static void SetBackLightOn() { CreateChangeEvent("BackLightChangeEvent", false); } |