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acmSTREAMHEADER Structure

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bzirk (VIP)

I am trying to call the acmStreamPrepareHeader function in the msacm32.dll
library as follows:

Public Declare Auto Function acmStreamPrepareHeader Lib "msacm32.dll" (ByVal
has As IntPtr, ByRef pash As sACMSTREAMHEADER, ByVal fdwPrepare As Int32) As
Int16

mmr = acmStreamPrepareHeader(hstr, strhdr, 0)

where hstr is an IntPtr returned by a preceding acmStreamOpen call and
strhdr is defined as:

<StructLayout(LayoutKind.Sequential, CharSet:=CharSet.Auto)> Public
Structure sACMSTREAMHEADER
Dim cbStruct As Int32
Dim fdwStatus As Int32
Dim dwUser As Int32
Dim pbSrc As UInt32
Dim cbSrcLength As Int32
Dim cbSrcLengthUsed As Int32
Dim cbSrcUser As Int32
Dim pbDst As UInt32
Dim cbDstLength As Int32
Dim cbDstLengthUsed As Int32
Dim dwDstUser As Int32
Dim dwReservedDriver As Int32
End Structure

and initialized as follows:

Dim strhdr As sACMSTREAMHEADER
strhdr.cbStruct = Marshal.SizeOf(strhdr)
strhdr.fdwStatus = 0
strhdr.pbSrc = pSrcWaveData.ToInt32
strhdr.cbSrcLength = SrcWaveData.Length
strhdr.pbDst = pDstWaveData.ToInt32
strhdr.cbDstLength = pdwOutputBytes

where pSrcWaveData is given by
pSrcWaveData = Marshal.AllocHGlobal(SrcWaveData.Length)

and pDstWaveData is given by
pDstWaveData = Marshal.AllocHGlobal(pdwOutputBytes)

SrcWaveData is a byte array.

The call to acmSteamPrepareHeader always return mmr=11, which is 'one or
more invalid parameters' What am I missing?

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William DePalo [MVP VC++] (VIP)

"bzirk" <Click here to reveal e-mail address> wrote in message
news:Click here to reveal e-mail address...
[Original message clipped]

There are two problems posting here:

1) This group is concerened with Visual C++ and not Visual Basic.

2) Multimedia issues like yours concerning the ACM are the subject of the
group

microsoft.public.win32.programmer.mmedia

If you don't get a reply here you should post again in a VB group (which? I
have no idea.) or the multimedia group I mentioned above.

Regards,
Will

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	System.IntPtr
	System.Runtime.InteropServices.CharSet
	System.Runtime.InteropServices.LayoutKind
	System.Runtime.InteropServices.Marshal
	System.UInt32

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