@msdn=http://search.microsoft.com/search/results.aspx?qu=$$$ @pinvoke=http://pinvoke.net/$$$.htm Summary: TODO - a short description !!!!C# Definition: [StructLayout(LayoutKind.Sequential, CharSet = CharSet.Ansi, Pack = 4)] public struct MIXERLINECONTROLS { private UInt32 cbStruct; /* size in bytes of MIXERLINECONTROLS */ private UInt32 dwLineID; /* line id (from MIXERLINE.dwLineID) */ private UInt32 dwControlID; /* MIXER_GETLINECONTROLSF_ONEBYID */ // private UInt32 dwControlType; //UNIONED with dwControlID /* MIXER_GETLINECONTROLSF_ONEBYTYPE */ private UInt32 cControls; /* count of controls pmxctrl points to */ private UInt32 cbmxctrl; /* size in bytes of _one_ MIXERCONTROL */ private IntPtr pamxctrl; /* pointer to first MIXERCONTROL array */ #region Properties /// <summary>size in bytes of MIXERLINECONTROLS</summary> public UInt32 StructSize { get { return this.cbStruct; } set { this.cbStruct = value; } } /// <summary>line id (from MIXERLINE.dwLineID)</summary> public UInt32 LineID { get { return this.dwLineID; } set { this.dwLineID = value; } } /// <summary>MIXER_GETLINECONTROLSF_ONEBYID</summary> public UInt32 ControlID { get { return this.dwControlID; } set { this.dwControlID = value; } } /// <summary>MIXER_GETLINECONTROLSF_ONEBYTYPE</summary> public MIXERCONTROL_CONTROLTYPE ControlType { get { return (MIXERCONTROL_CONTROLTYPE)this.dwControlID; } set { this.dwControlID = (uint)value; } } /// <summary>count of controls pmxctrl points to</summary> public UInt32 Controls { get { return this.cControls; } set { this.cControls = value; } } /// <summary>size in bytes of _one_ MIXERCONTROL</summary> public UInt32 MixerControlItemSize { get { return this.cbmxctrl; } set { this.cbmxctrl = value; } } /// <summary>pointer to first MIXERCONTROL array</summary> public IntPtr MixerControlArray { get { return this.pamxctrl; } set { this.pamxctrl = value; } } #endregion } !!!!VB Definition: THIS IS MY CONVERSION FROM THE C# ABOVE. I have used an UInt32 instead of the MIXERCONTROL_CONTROLTYPE enum as I didn't bother converting it. Also I set dwLineID as an Integer as I was getting a negative number come back from the APIs. <StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Ansi, Pack:=4)> _ Public Structure MIXERLINECONTROLS Private cbStruct As UInt32 '/* size in bytes of MIXERLINECONTROLS */ Private dwLineID As Integer '/* line id (from MIXERLINE.dwLineID) */ Private dwControlID As UInt32 '/* MIXER_GETLINECONTROLSF_ONEBYID */ 'private UInt32 dwControlType; //UNIONED with dwControlID /* MIXER_GETLINECONTROLSF_ONEBYTYPE */ Private cControls As UInt32 '/* count of controls pmxctrl points to */ Private cbmxctrl As UInt32 '/* size in bytes of _one_ MIXERCONTROL */ Private pamxctrl As IntPtr '/* pointer to first MIXERCONTROL array */ '/// <summary>size in bytes of MIXERLINECONTROLS</summary> Public Property StructSize As UInt32 Get Return cbStruct End Get Set(ByVal value As UInt32) cbStruct = value End Set End Property '/// <summary>line id (from MIXERLINE.dwLineID)</summary> Public Property LineID As Integer Get Return dwLineID End Get Set(ByVal value As Integer) dwLineID = value End Set End Property '/// <summary>MIXER_GETLINECONTROLSF_ONEBYID</summary> Public Property ControlID As UInt32 Get Return dwControlID End Get Set(ByVal value As UInt32) dwControlID = value End Set End Property '/// <summary>MIXER_GETLINECONTROLSF_ONEBYTYPE</summary> Public Property ControlType As UInt32 Get Return dwControlID End Get Set(ByVal value As UInt32) dwControlID = value End Set End Property '/// <summary>count of controls pmxctrl points to</summary> Public Property Controls As UInt32 Get Return cControls End Get Set(ByVal value As UInt32) cControls = value End Set End Property '/// <summary>size in bytes of _one_ MIXERCONTROL</summary> Public Property MixerControlItemSize As UInt32 Get Return cbmxctrl End Get Set(ByVal value As UInt32) cbmxctrl = value End Set End Property '/// <summary>pointer to first MIXERCONTROL array</summary> Public Property MixerControlArray As IntPtr Get Return pamxctrl End Get Set(ByVal value As IntPtr) pamxctrl = value End Set End Property End Structure !!!!User-Defined Field Types: None. !!!!Notes: The winmm dll may not execute properly on 64-bit systems. Consequently, the StructLayout must be Sequential, with CharSet = Ansi, and Pack = 4. This particular type has some special layout considerations (the c '''union''' keyword) which typically means developers would use the explicit layout. However, the explicit layout breaks down on 64-bit systems for any type with an [IntPtr] in the type. Consequently, the C# types have been redesigned to use [Sequential] layout so that they will automatically adjust to 64-bit systems. This means private fields with public properties which perform the gunky work of making it look like there is a union. !!!!Sample Code: There is more code that is necessary to use the C# types listed above. private const uint MIXERCONTROL_CT_CLASS_MASK = 0xF0000000u; private const uint MIXERCONTROL_CT_CLASS_CUSTOM = 0x00000000u; private const uint MIXERCONTROL_CT_CLASS_METER = 0x10000000u; private const uint MIXERCONTROL_CT_CLASS_SWITCH = 0x20000000u; private const uint MIXERCONTROL_CT_CLASS_NUMBER = 0x30000000u; private const uint MIXERCONTROL_CT_CLASS_SLIDER = 0x40000000u; private const uint MIXERCONTROL_CT_CLASS_FADER = 0x50000000u; private const uint MIXERCONTROL_CT_CLASS_TIME = 0x60000000u; private const uint MIXERCONTROL_CT_CLASS_LIST = 0x70000000u; private const uint MIXERCONTROL_CT_SUBCLASS_MASK = 0x0F000000u; private const uint MIXERCONTROL_CT_SC_SWITCH_BOOLEAN = 0x00000000u; private const uint MIXERCONTROL_CT_SC_SWITCH_BUTTON = 0x01000000u; private const uint MIXERCONTROL_CT_SC_METER_POLLED = 0x00000000u; private const uint MIXERCONTROL_CT_SC_TIME_MICROSECS = 0x00000000u; private const uint MIXERCONTROL_CT_SC_TIME_MILLISECS = 0x01000000u; private const uint MIXERCONTROL_CT_SC_LIST_SINGLE = 0x00000000u; private const uint MIXERCONTROL_CT_SC_LIST_MULTIPLE = 0x01000000u; private const uint MIXERCONTROL_CT_UNITS_MASK = 0x00FF0000u; private const uint MIXERCONTROL_CT_UNITS_CUSTOM = 0x00000000u; private const uint MIXERCONTROL_CT_UNITS_BOOLEAN = 0x00010000u; private const uint MIXERCONTROL_CT_UNITS_SIGNED = 0x00020000u; private const uint MIXERCONTROL_CT_UNITS_UNSIGNED = 0x00030000u; private const uint MIXERCONTROL_CT_UNITS_DECIBELS = 0x00040000u; /* in 10ths */ private const uint MIXERCONTROL_CT_UNITS_PERCENT = 0x00050000u; /* in 10ths */ /// <summary>Commonly used control types for specifying MIXERCONTROL.dwControlType</summary> public enum MIXERCONTROL_CONTROLTYPE : uint { CUSTOM =(MIXERCONTROL_CT_CLASS_CUSTOM | MIXERCONTROL_CT_UNITS_CUSTOM), BOOLEANMETER =(MIXERCONTROL_CT_CLASS_METER | MIXERCONTROL_CT_SC_METER_POLLED | MIXERCONTROL_CT_UNITS_BOOLEAN), SIGNEDMETER =(MIXERCONTROL_CT_CLASS_METER | MIXERCONTROL_CT_SC_METER_POLLED | MIXERCONTROL_CT_UNITS_SIGNED), PEAKMETER =(SIGNEDMETER + 1), UNSIGNEDMETER =(MIXERCONTROL_CT_CLASS_METER | MIXERCONTROL_CT_SC_METER_POLLED | MIXERCONTROL_CT_UNITS_UNSIGNED), BOOLEAN =(MIXERCONTROL_CT_CLASS_SWITCH | MIXERCONTROL_CT_SC_SWITCH_BOOLEAN | MIXERCONTROL_CT_UNITS_BOOLEAN), ONOFF =(BOOLEAN + 1), MUTE =(BOOLEAN + 2), MONO =(BOOLEAN + 3), LOUDNESS =(BOOLEAN + 4), STEREOENH =(BOOLEAN + 5), BASS_BOOST =(BOOLEAN + 0x00002277), BUTTON =(MIXERCONTROL_CT_CLASS_SWITCH | MIXERCONTROL_CT_SC_SWITCH_BUTTON | MIXERCONTROL_CT_UNITS_BOOLEAN), DECIBELS =(MIXERCONTROL_CT_CLASS_NUMBER | MIXERCONTROL_CT_UNITS_DECIBELS), SIGNED =(MIXERCONTROL_CT_CLASS_NUMBER | MIXERCONTROL_CT_UNITS_SIGNED), UNSIGNED =(MIXERCONTROL_CT_CLASS_NUMBER | MIXERCONTROL_CT_UNITS_UNSIGNED), PERCENT =(MIXERCONTROL_CT_CLASS_NUMBER | MIXERCONTROL_CT_UNITS_PERCENT), SLIDER =(MIXERCONTROL_CT_CLASS_SLIDER | MIXERCONTROL_CT_UNITS_SIGNED), PAN =(SLIDER + 1), QSOUNDPAN =(SLIDER + 2), FADER =(MIXERCONTROL_CT_CLASS_FADER | MIXERCONTROL_CT_UNITS_UNSIGNED), VOLUME =(FADER + 1), BASS =(FADER + 2), TREBLE =(FADER + 3), EQUALIZER =(FADER + 4), SINGLESELECT =(MIXERCONTROL_CT_CLASS_LIST | MIXERCONTROL_CT_SC_LIST_SINGLE | MIXERCONTROL_CT_UNITS_BOOLEAN), MUX =(SINGLESELECT + 1), MULTIPLESELECT =(MIXERCONTROL_CT_CLASS_LIST | MIXERCONTROL_CT_SC_LIST_MULTIPLE | MIXERCONTROL_CT_UNITS_BOOLEAN), MIXER =(MULTIPLESELECT + 1), MICROTIME =(MIXERCONTROL_CT_CLASS_TIME | MIXERCONTROL_CT_SC_TIME_MICROSECS | MIXERCONTROL_CT_UNITS_UNSIGNED), MILLITIME =(MIXERCONTROL_CT_CLASS_TIME | MIXERCONTROL_CT_SC_TIME_MILLISECS | MIXERCONTROL_CT_UNITS_UNSIGNED), } Documentation: MIXERLINECONTROLS@msdn on MSDN
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