cwavefile.cpp

windows embedded ce (wince6.0)上录音事例程序源码。可编成.exe在系统上运行。

//
// Copyright (c) Microsoft Corporation.  All rights reserved.
//
//
// Use of this sample source code is subject to the terms of the Microsoft
// license agreement under which you licensed this sample source code. If
// you did not accept the terms of the license agreement, you are not
// authorized to use this sample source code. For the terms of the license,
// please see the license agreement between you and Microsoft or, if applicable,
// see the LICENSE.RTF on your install media or the root of your tools installation.
// THE SAMPLE SOURCE CODE IS PROVIDED "AS IS", WITH NO WARRANTIES.
//
/*++

Module Name:

	WaveFile.cpp

Abstract:

	This file contains the code for WAVE-RIFF file library.  This library
	creates, opens, reads, writes, and closes WAVE-RIFF files.

Notes:

--*/
#include "CWaveFile.h"

inline DWORD CWaveFile::WaveFileError( void )
{
    RETAILMSG(1, (TEXT("ERROR: WaveFileError void")));
    dwLastError = GetLastError();
    Close();
    return dwLastError;

} // end inline DWORD CWaveFile::WaveFileError( void )

inline DWORD CWaveFile::WaveFileError( DWORD dwError )
{
    RETAILMSG(1, (TEXT("ERROR: WaveFileError %d"), dwError));
    dwLastError = dwError;
    Close();
    return dwLastError;

} // end

/*++

CWaveFile::Close:

	This function closes all of the file handles.

Arguments:

	NONE

Return Value:

	NONE

Notes:

--*/
inline VOID CWaveFile::Close()
{
    BOOL    bRtn;
    DWORD   dwRtn;
    BYTE    byTemp;

    if(INVALID_HANDLE_VALUE != hWaveData)
    {
	

    dwRtn = GetFileSize( hWaveData, NULL );
    if( dwRtn % 2 )
    {
        SetFilePointer( hWaveData, 0, NULL, FILE_END );
        byTemp = 0;
        WriteFile( hWaveData, &byTemp, 1, &dwRtn, NULL );
    }
    }


    if (INVALID_HANDLE_VALUE != hWaveData)
    {
        bRtn = CloseHandle( hWaveData );
        if( bRtn )
            hWaveData = INVALID_HANDLE_VALUE;

    }

    if (INVALID_HANDLE_VALUE != hRiffSize)
    {
        bRtn = CloseHandle( hRiffSize );
        if( bRtn )
            hRiffSize = INVALID_HANDLE_VALUE;
    }

    if (INVALID_HANDLE_VALUE != hWaveSize)
    {
        bRtn = CloseHandle( hWaveSize );
        if( bRtn )
            hWaveSize = INVALID_HANDLE_VALUE;
    }

    /* --------------------------------------------------------------------
    	Reset all offset and sizes to zero
    -------------------------------------------------------------------- */
    nRiffSize = 0;
    nWaveSize = 0;
    dwDataOffSet = 0;
    dwInfoOffSet = 0;

    nSamples = 0;

} // end CWaveFile:Close();

/*++

CWaveFile::WriteSize:

	This function writes the new value of the RIFF chunks data size.

Arguments:

    HANDLE  hFileSize   -> Handle to write to.
    DWORD   nBytes     -> The number of bytes in the chunks data size.

Return Value:

	TRUE    ->  Success
	FALSE   ->  Failed

Notes:

--*/
inline BOOL CWaveFile::WriteSize(HANDLE hFileSize, DWORD nBytes)
{
    BOOL    bRtn;
    DWORD   dwRtn;

    // CHECK ME
    if (INVALID_HANDLE_VALUE == hFileSize)
    	{
              RETAILMSG(1, (TEXT("ERROR:WRITESIZE:  hFileSize == INVALID_HANDLE_VALUE")));
		return FALSE;
    	}

    bRtn = WriteFile( hFileSize, &nBytes, 4, &dwRtn, NULL );
    dwLastError = GetLastError();

    if( dwRtn < 4 )
        bRtn = FALSE;

    dwRtn = SetFilePointer( hFileSize,
                            -4,
                            NULL,
                            FILE_CURRENT );	

    if( 0xFFFFFFFF == dwRtn )
    {
        bRtn = FALSE;
        dwLastError = GetLastError();
    }


    return bRtn;

} // end inline BOOL CWaveFile::WriteSize(HANDLE hFileSize, DWORD nBytes)

/*++

CWaveFile::CWaveFile:

	Default Constructor for CWaveFile

Arguments:

	NONE

Return Value:

	NONE

Notes:

--*/
CWaveFile::CWaveFile( )
{
    hWaveData = INVALID_HANDLE_VALUE;
    hRiffSize = INVALID_HANDLE_VALUE;
    hWaveSize = INVALID_HANDLE_VALUE;

    nRiffSize = 0;
    nWaveSize = 0;
    dwDataOffSet = 0;
    dwInfoOffSet = 0;

    nSamples = 0;

    dwLastError = ERROR_FILE_NOT_FOUND;

} // end CWaveFile::~CWaveFile()


/*++

CWaveFile::CWaveFile:

    Full constructor for a WAVE-RIFF file.

Arguments:

    lpFileName -> Same As CreateFile
    dwDesiredAccess -> Same As CreateFile, except can't be 0
    dwShareMode -> Same As CreateFile except, can't be FILE_SHARE_DELETE
    dwCreationDistribution -> Same As CreateFile
    dwFlagsAndAttributes -> Same As CreateFile

Return Value:

    NONE:

Notes:

    Most file CreateFile options are supported with the limitation that an
    open WAVE-RIFF file must be able to played and/or recorded.

    Also, security and templetes are not supported.

--*/
CWaveFile::CWaveFile( LPCTSTR   lpFileName,
                       DWORD    dwDesiredAccess,
                       DWORD    dwCreationDistribution,
                       DWORD    dwFlagsAndAttributes,
                       LPVOID*  lplpWaveFormat,
                       LPVOID*  lplpInfo )
{
    hWaveData = INVALID_HANDLE_VALUE;
    hRiffSize = INVALID_HANDLE_VALUE;
    hWaveSize = INVALID_HANDLE_VALUE;

    nRiffSize = 0;
    nWaveSize = 0;
    dwDataOffSet = 0;
    dwInfoOffSet = 0;

    nSamples = 0;

    dwLastError = Create(lpFileName,
                         dwDesiredAccess,
                         dwCreationDistribution,
                         dwFlagsAndAttributes,
                         lplpWaveFormat,
                         lplpInfo );

} // end CWaveFile::CWaveFile( ... )



/*++

CWaveFile::~CWaveFile:

	This is the class Destructor.

Arguments:

	NONE

Return Value:

	NONE

Notes:

--*/
CWaveFile::~CWaveFile()
{
    Close();

} // CWaveFile::~CWaveFile()


/*++

CWaveFile::Create:

    This function creates or opens WAVE-RIFF file with complete header
    information.	

    If the file already exists and the file creation parameters allow it
    to be opened. lpPcmWaveFormat is filled with the WAVE-RIFF file's
    format data.  It is the calling function's responsability to call
    GetLastError in order to see if the file already existed.

    If the file already exists but isn't a legal wave file the HANDLE will
    be closed and INVALID_HANDLE_VALUE will be returned. GetLastError will
    be set to ERROR_FILE_CORRUPT.

Arguments:

    lpFileName -> Same As CreateFile
    dwDesiredAccess -> Same As CreateFile, except can't be 0
    dwShareMode -> Same As CreateFile except, can't be FILE_SHARE_DELETE
    dwCreationDistribution -> Same As CreateFile
    dwFlagsAndAttributes -> Same As CreateFile
    lpPcmWaveFormat     -> Pointer to a wave format structure
    lplpInfo            -> Pointer to a pointer that will hold the info data.

Return Value:

    If function is successful then ERROR_SUCCESS is returned.

    If the specified file exists before the function call
    and dwCreationDistribution is CREATE_ALWAYS or OPEN_ALWAYS, then
    ERROR_ALREADY_EXISTS (even though the function has succeeded).
    If the file does not exist before the call, function returns zero.

    If the function fails, the file creation error is returned.

Notes:

    Most file CreateFile options are supported with the limitation that an
    open WAVE-RIFF file must be able to played and/or recorded.

    Also, security and templetes are not supported.

    If the file is new and lplpInfo isn't NULL then it is assumed that
    lplpInfo contains a valid LIST-INFO chunk and that chunk is writen
    to the file.

--*/
DWORD CWaveFile::Create( LPCTSTR         lpFileName,
                         DWORD           dwDesiredAccess,
                         DWORD           dwCreationDistribution,
                         DWORD           dwFlagsAndAttributes,
                         LPVOID          *lplpWaveFormat,
                         LPVOID          *lplpInfo )
{

    hWaveData = CreateFile( lpFileName,
                            dwDesiredAccess,
                            FILE_SHARE_READ | FILE_SHARE_WRITE,
                            NULL,
                            dwCreationDistribution,
                            dwFlagsAndAttributes,
                            NULL );
    if( INVALID_HANDLE_VALUE == hWaveData )
    {
        RETAILMSG(1, (TEXT("ERROR: CREATE:  hWaveData == INVALID_HANDLE_VALUE")));
        return dwLastError = GetLastError();
    }

    /* --------------------------------------------------------------------
        NOTE:  hRiffSize and hWaveSize are write optimizations.  They are
        not needed for read only files and there for will not be used for
        read only files.
    -------------------------------------------------------------------- */
    if( dwDesiredAccess & GENERIC_WRITE )
    {
        hRiffSize = CreateFile( lpFileName,
                                dwDesiredAccess,
                                FILE_SHARE_READ | FILE_SHARE_WRITE,