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
|
1
2
3
4
5
6
7
8
9
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
|
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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
/// <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(@"ControlPanel\Volume", 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
|
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
|
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);
} |