acmStreamSize - Win32 Multimedia Programmer's Reference

Custom Search

	Overview

	Group

	Quick Info

acmStreamSize

The acmStreamSize function returns a recommended size for a source or destination buffer on an ACM stream.

MMRESULT acmStreamSize(

HACMSTREAM has,
DWORD cbInput,
LPDWORD pdwOutputBytes,
DWORD fdwSize
);

Parameters
has

Handle of the conversion stream.

cbInput

Size, in bytes, of the source or destination buffer. The fdwSize flags specify what the input parameter defines. This parameter must be nonzero.

pdwOutputBytes

Address of a variable that contains the size, in bytes, of the source or destination buffer. The fdwSize flags specify what the output parameter defines. If the acmStreamSize function succeeds, this location will always be filled with a nonzero value.

fdwSize

Flags for the stream size query. The following values are defined:

ACM_STREAMSIZEF_DESTINATION

The cbInput parameter contains the size of the destination buffer. The pdwOutputBytes parameter will receive the recommended source buffer size, in bytes.

ACM_STREAMSIZEF_SOURCE

The cbInput parameter contains the size of the source buffer. The pdwOutputBytes parameter will receive the recommended destination buffer size, in bytes.

Return Values
Returns zero if successful or an error otherwise. Possible error values include the following:

ACMERR_NOTPOSSIBLE	The requested operation cannot be performed.
MMSYSERR_INVALFLAG	At least one flag is invalid.
MMSYSERR_INVALHANDLE	The specified handle is invalid.
MMSYSERR_INVALPARAM	At least one parameter is invalid.

Remarks
An application can use this function to determine suggested buffer sizes for either source or destination buffers. The buffer sizes returned might be only an estimation of the actual sizes required for conversion. Because actual conversion sizes cannot always be determined without performing the conversion, the sizes returned will usually be overestimated.

In the event of an error, the location pointed to by pdwOutputBytes will receive zero. This assumes that the pointer specified by pdwOutputBytes is valid.

Last news from Greatis Software

    Nostalgia .Net     .Net is powerful, but not all-powerful, so sometimes we need to use Win32 API for our .Net applications. It's simple enough with Platform Invoke if you have Win32 skill, but we do not always have time to dig the ancient documentation, declare the special types that are compatible with Win32, find the values of the Win32's constants and so on. Nostalgia .Net offers several simple-to-use classes, and components that will allow you to forget about the headache of Win32 and just use the power of Win32 in your application the same way as you use the native. Net classes. More »

Recommended software for developers

    Ultimate Pack     Component pack for Delphi and C++ Builder that contains runtime form designer, runtime object inspector, print suite and much more for the very special price. More »

    Form Designer .Net     Unique runtime form design solution that allows to edit any form in .Net WinForms application at runtime with full source codes for only 300 euro! More »

    Print Suite .Net     Print Suite .Net is a set of components for easy printing texts, images and grids from your WinForms applications. Full C# source codes are available More »

    Gradient Controls .Net     Gradient Controls .Net offers controls with gradient background feature. Labels, panels and so on... Full C# source codes are available More »

    Greatis iGrid     iGrid plots drawing grid right over your desktop, so you can use it everywhere, with any drawing application without any special plugins for different graphic editors. More »

All the contacts and projects

Dmitry Vasiliev (just.dmitry)

More Online Helps

Win32 Programmer's Reference
Win32 Multimedia Programmer's Reference
OLE Programmer's Reference
Microsoft Windows Pen API Programmer's Reference
Microsoft Windows Sockets 2 Reference
Microsoft Windows Telephony API (TAPI) Programmer's Reference
Unix Manual Pages

greatis just4fun network