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public static extern uint waveInAddBuffer(IntPtr hwi, ref WAVEHDR pwh, int cbwh);
VB Signature:
<DllImport("winmm.dll")> _
Shared Function waveInAddBuffer(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByVal pwh As IntPtr, ByVal cbwh As UInteger) As MMRESULT
End Function
<DllImport("winmm.dll")> _
Shared Function waveInAddBuffer(<MarshalAs(UnmanagedType.I4)> ByVal hwi As Integer, ByRef pwh As WAVEHDR, ByVal cbwh As UInteger) As MMRESULT
End Function
When recording waveform audio, usually buffers are allocated with unmanaged functions and kept in an IntPtr() array; for this reason the function is provided in two versions, one processing a WAVEHDR ByRef and the other working with an IntPtr.
Tips & Tricks:
Instead of allocating memory using an unmanaged function, it is possible to lock the WAVEHDR and Buffer in place using GCHandle.Allocate(object, GCHandleType.Pinned);
Sample Code:
Please add some!
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
TODO - a short description
12/30/2010 2:45:57 PM - -92.238.51.9
Enumeration for the MMRESULT possible values in winmm.dll
7/21/2010 3:53:56 PM - -65.122.179.242
ByRef is a VB keyword that specifies a variable to be passed as a parameter BY REFERENCE. In other words, the pointer to the variable is passed and any change to its value made within the function or sub will change its value outside the function/sub.
4/25/2007 3:19:29 AM - anonymous
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
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