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waveOutSetVolume (coredll)
coredll is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for waveOutSetVolume in other DLLs exists, click on Find References to the right.
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C# Signature:
[DllImport("coredll.dll", SetLastError=true)]
protected static extern int waveOutSetVolume(IntPtr device, uint volume);
VB Signature:
Declare Function waveOutSetVolume Lib "coredll.dll" (ByVal device As IntPtr, ByVal volume As Integer) As Integer
User-Defined Types:
None.
Notes:
values for 'volume' are between value between 0 (off) and 65536 (max)
if there is only one audio device, you can set 'device' to null (or IntPtr.Zero)
Tips & Tricks:
Please add some!
Sample Code:
// The volume to pass in (0xffff or 65535 equals max volume)
uint newVolume = (uint)0xffff;
// Set this value in the left and right channels
uint NewVolumeAllChannels = ((( uint )newVolume & 0x0000ffff) | (( uint )newVolume << 16));
// Call func to set volume.
waveOutSetVolume(IntPtr.Zero, NewVolumeAllChannels);
But I create this example below.
public enum Volumes : int {
OFF = 0,
LOW = 858993459,
NORMAL = 1717986918,
MEDIUM = -1717986919,
HIGH = -858993460,
VERY_HIGH = -1
}
[DllImport("coredll.dll", SetLastError=true)]
internal static extern int waveOutSetVolume(IntPtr device, int volume);
[DllImport("coredll.dll", SetLastError=true)]
internal static extern int waveOutGetVolume(IntPtr device, ref int volume);
public static Volumes Volume {
get {
int v = (int)0;
waveOutGetVolume(IntPtr.Zero, ref v);
switch (v) {
case (int)Volumes.OFF: return Volumes.OFF;
case (int)Volumes.LOW: return Volumes.LOW;
case (int)Volumes.NORMAL: return Volumes.NORMAL;
case (int)Volumes.MEDIUM: return Volumes.MEDIUM;
case (int)Volumes.HIGH: return Volumes.HIGH;
case (int)Volumes.VERY_HIGH: return Volumes.VERY_HIGH;
default: return Volumes.OFF;
}
}
set { waveOutSetVolume(IntPtr.Zero, (int)value); }
}
Alternative Managed API:
Do you know one? Please contribute it!
An IntPtr is a pointer to a memory location (unmanaged) that adapts to the platform it is running on (64-bit, etc.) UNLIKE a standard int/Integer. You should always use this type for unmanaged calls that require it, even though an int will appear to work on your development machine.
1/13/2008 4:00:13 AM - Damon Carr-72.43.165.29
Please edit this page!
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