Explain Class

Thank you very much :) Sorry for bothering you but i'm a beginner in csharp and I want to learn it very well,and I noticed that you have a very good knowledg in csharp so if you dont mind can I ask you other questions please??????
I dont know exactly what this function do:

internal class WaveNative

{

// consts

public const int MMSYSERR_NOERROR = 0; // no error

public const int MM_WOM_OPEN = 0x3BB;

public const int MM_WOM_CLOSE = 0x3BC;

public const int MM_WOM_DONE = 0x3BD;

public const int MM_WIM_OPEN = 0x3BE;

public const int MM_WIM_CLOSE = 0x3BF;

public const int MM_WIM_DATA = 0x3C0;

public const int CALLBACK_FUNCTION = 0x00030000; // dwCallback is a FARPROC

public const int TIME_MS = 0x0001; // time in milliseconds

public const int TIME_SAMPLES = 0x0002; // number of wave samples

public const int TIME_BYTES = 0x0004; // current byte offset

// callbacks

public delegate void WaveDelegate(IntPtr hdrvr, int uMsg, int dwUser, ref WaveHdr wavhdr, int dwParam2);

// structs

[StructLayout(LayoutKind.Sequential)]

public struct WaveHdr

{

public IntPtr lpData; // pointer to locked data buffer

public int dwBufferLength; // length of data buffer

public int dwBytesRecorded; // used for input only

public IntPtr dwUser; // for client's use

public int dwFlags; // assorted flags (see defines)

public int dwLoops; // loop control counter

public IntPtr lpNext; // PWaveHdr, reserved for driver

public int reserved; // reserved for driver

}

private const string mmdll = "winmm.dll";

// WaveOut calls

[DllImport(mmdll)]

public static extern int waveOutGetNumDevs();

[DllImport(mmdll)]

public static extern int waveOutPrepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);

[DllImport(mmdll)]

public static extern int waveOutUnprepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);

[DllImport(mmdll)]

public static extern int waveOutWrite(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);

[DllImport(mmdll)]

public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormatStream lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);

[DllImport(mmdll)]

public static extern int waveOutReset(IntPtr hWaveOut);

[DllImport(mmdll)]

public static extern int waveOutClose(IntPtr hWaveOut);

[DllImport(mmdll)]

public static extern int waveOutPause(IntPtr hWaveOut);

[DllImport(mmdll)]

public static extern int waveOutRestart(IntPtr hWaveOut);

[DllImport(mmdll)]

public static extern int waveOutGetPosition(IntPtr hWaveOut, out int lpInfo, int uSize);

[DllImport(mmdll)]

public static extern int waveOutSetVolume(IntPtr hWaveOut, int dwVolume);

[DllImport(mmdll)]

public static extern int waveOutGetVolume(IntPtr hWaveOut, out int dwVolume);

// WaveIn calls

[DllImport(mmdll)]

public static extern int waveInGetNumDevs();

[DllImport(mmdll)]

public static extern int waveInAddBuffer(IntPtr hwi, ref WaveHdr pwh, int cbwh);

[DllImport(mmdll)]

public static extern int waveInClose(IntPtr hwi);

[DllImport(mmdll)]

public static extern int waveInOpen(out IntPtr phwi, int uDeviceID, WaveFormatStream lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);

[DllImport(mmdll)]

public static extern int waveInPrepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);

[DllImport(mmdll)]

public static extern int waveInUnprepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);

[DllImport(mmdll)]

public static extern int waveInReset(IntPtr hwi);

[DllImport(mmdll)]

public static extern int waveInStart(IntPtr hwi);

[DllImport(mmdll)]

public static extern int waveInStop(IntPtr hwi);

}

3 Replies

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Jaganathan Bantheswaran15y ago
Accepted answer
Hi,

They are defining a class called WaveNative which imports the methods from winmm.dll.

If you are interested to learn C# very well then read some c# books and practice by doing project in C#.

if this reply helps you then mark it as Correct answer.
sawass sawass15y ago
Thank you very much :) Sorry for bothering you but i'm a beginner in csharp and I want to learn it very well,and I noticed that you have a very good knowledg in csharp so if you dont mind can I ask you other questions please??????
I dont know exactly what this function do:

internal class WaveNative
{
// consts
public const int MMSYSERR_NOERROR = 0; // no error

public const int MM_WOM_OPEN = 0x3BB;
public const int MM_WOM_CLOSE = 0x3BC;
public const int MM_WOM_DONE = 0x3BD;

public const int MM_WIM_OPEN = 0x3BE;
public const int MM_WIM_CLOSE = 0x3BF;
public const int MM_WIM_DATA = 0x3C0;

public const int CALLBACK_FUNCTION = 0x00030000; // dwCallback is a FARPROC

public const int TIME_MS = 0x0001; // time in milliseconds
public const int TIME_SAMPLES = 0x0002; // number of wave samples
public const int TIME_BYTES = 0x0004; // current byte offset

// callbacks
public delegate void WaveDelegate(IntPtr hdrvr, int uMsg, int dwUser, ref WaveHdr wavhdr, int dwParam2);

// structs

[StructLayout(LayoutKind.Sequential)]
public struct WaveHdr
{
public IntPtr lpData; // pointer to locked data buffer
public int dwBufferLength; // length of data buffer
public int dwBytesRecorded; // used for input only
public IntPtr dwUser; // for client's use
public int dwFlags; // assorted flags (see defines)
public int dwLoops; // loop control counter
public IntPtr lpNext; // PWaveHdr, reserved for driver
public int reserved; // reserved for driver
}

private const string mmdll = "winmm.dll";

// WaveOut calls
[DllImport(mmdll)]
public static extern int waveOutGetNumDevs();
[DllImport(mmdll)]
public static extern int waveOutPrepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
[DllImport(mmdll)]
public static extern int waveOutUnprepareHeader(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
[DllImport(mmdll)]
public static extern int waveOutWrite(IntPtr hWaveOut, ref WaveHdr lpWaveOutHdr, int uSize);
[DllImport(mmdll)]
public static extern int waveOutOpen(out IntPtr hWaveOut, int uDeviceID, WaveFormatStream lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
[DllImport(mmdll)]
public static extern int waveOutReset(IntPtr hWaveOut);
[DllImport(mmdll)]
public static extern int waveOutClose(IntPtr hWaveOut);
[DllImport(mmdll)]
public static extern int waveOutPause(IntPtr hWaveOut);
[DllImport(mmdll)]
public static extern int waveOutRestart(IntPtr hWaveOut);
[DllImport(mmdll)]
public static extern int waveOutGetPosition(IntPtr hWaveOut, out int lpInfo, int uSize);
[DllImport(mmdll)]
public static extern int waveOutSetVolume(IntPtr hWaveOut, int dwVolume);
[DllImport(mmdll)]
public static extern int waveOutGetVolume(IntPtr hWaveOut, out int dwVolume);

// WaveIn calls
[DllImport(mmdll)]
public static extern int waveInGetNumDevs();
[DllImport(mmdll)]
public static extern int waveInAddBuffer(IntPtr hwi, ref WaveHdr pwh, int cbwh);
[DllImport(mmdll)]
public static extern int waveInClose(IntPtr hwi);
[DllImport(mmdll)]
public static extern int waveInOpen(out IntPtr phwi, int uDeviceID, WaveFormatStream lpFormat, WaveDelegate dwCallback, int dwInstance, int dwFlags);
[DllImport(mmdll)]
public static extern int waveInPrepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);
[DllImport(mmdll)]
public static extern int waveInUnprepareHeader(IntPtr hWaveIn, ref WaveHdr lpWaveInHdr, int uSize);
[DllImport(mmdll)]
public static extern int waveInReset(IntPtr hwi);
[DllImport(mmdll)]
public static extern int waveInStart(IntPtr hwi);
[DllImport(mmdll)]
public static extern int waveInStop(IntPtr hwi);
}
Jaganathan Bantheswaran15y ago
Hi,

They are calculating the Bytes of wave stream for one second.