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Tricks of the Windows Gam…ming Gurus (2nd Edition)
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dstrenum.c
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1997-07-14
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142 lines
/*==========================================================================
*
* Copyright (C) 1995-1996 Microsoft Corporation. All Rights Reserved.
*
* File: dstrenum.c
* Content: Illustrates enumerating DirectSound drivers
*
***************************************************************************/
#define WIN32_LEAN_AND_MEAN
#include <windows.h>
#include <windowsx.h>
#include <mmsystem.h>
#include <dsound.h>
#include <memory.h>
#include "dsstream.h"
extern HINSTANCE hInst;
extern HWND hWndMain;
/****************************************************************************/
/* DoDSoundEnumerate() */
/* */
/* This function takes care of handling the DirectSound enumeration, which*/
/* simply means creating a dialog box, at this point... */
/****************************************************************************/
BOOL DoDSoundEnumerate( LPGUID lpGUID )
{
if( DialogBoxParam( hInst, MAKEINTRESOURCE(IDD_DSENUMBOX), hWndMain,
DSEnumDlgProc, (LPARAM)lpGUID ))
return( TRUE );
return( FALSE );
}
/****************************************************************************/
/* DSEnumDlgProc() */
/* */
/* Dialog procedure for the DSound enumeration choice dialog. Allows the */
/* user to choose from installed drivers. Returns TRUE on error. */
/****************************************************************************/
BOOL CALLBACK DSEnumDlgProc( HWND hDlg, UINT msg,
WPARAM wParam, LPARAM lParam )
{
static HWND hCombo;
static LPGUID lpGUID;
LPGUID lpTemp;
int i;
switch( msg )
{
case WM_INITDIALOG:
hCombo = GetDlgItem( hDlg, IDC_DSENUM_COMBO );
lpGUID = (LPGUID)lParam;
if( DirectSoundEnumerate( (LPDSENUMCALLBACK)DSEnumProc, &hCombo ) != DS_OK )
{
EndDialog( hDlg, TRUE );
return( TRUE );
}
if( ComboBox_GetCount( hCombo ))
ComboBox_SetCurSel( hCombo, 0 );
else
{
EndDialog( hDlg, TRUE );
return( TRUE );
}
return( TRUE );
case WM_COMMAND:
switch( LOWORD( wParam ))
{
case IDOK:
for( i = 0; i < ComboBox_GetCount( hCombo ); i++ )
{
lpTemp = (LPGUID)ComboBox_GetItemData( hCombo, i );
if( i == ComboBox_GetCurSel( hCombo ))
{
if( lpTemp != NULL )
memcpy( lpGUID, lpTemp, sizeof(GUID));
else
lpGUID = NULL;
}
if( lpTemp )
LocalFree( lpTemp );
}
// If we got the NULL GUID, then we want to open the default
// sound driver, so return with an error and the init code
// will know not to pass in the guID and will send NULL
// instead.
if( lpGUID == NULL )
EndDialog( hDlg, TRUE );
else
EndDialog( hDlg, FALSE );
return( TRUE );
case IDCANCEL:
// Force a NULL GUID
EndDialog( hDlg, TRUE );
return( TRUE );
}
break;
default:
return( FALSE );
}
return( FALSE );
}
/****************************************************************************/
/* DSEnumProc() */
/* */
/* This is the Enumeration procedure called by DirectSoundEnumerate with */
/* the parameters of each DirectSound Object available in the system. */
/****************************************************************************/
BOOL CALLBACK DSEnumProc( LPGUID lpGUID, LPSTR lpszDesc,
LPSTR lpszDrvName, LPVOID lpContext )
{
HWND hCombo = *(HWND *)lpContext;
LPGUID lpTemp = NULL;
if( lpGUID != NULL )
{
if(( lpTemp = LocalAlloc( LPTR, sizeof(GUID))) == NULL )
return( TRUE );
memcpy( lpTemp, lpGUID, sizeof(GUID));
}
ComboBox_AddString( hCombo, lpszDesc );
ComboBox_SetItemData( hCombo,
ComboBox_FindString( hCombo, 0, lpszDesc ),
lpTemp );
return( TRUE );
}