DirectX dsutil.cpp error

[Netwatcher]

I've been trying to compile a program, everything is going fine until i get this little error:

------ Build started: Project: Play_Sound, Configuration: Debug Win32 ------
Compiling...
dsutil.cpp
c:\documents and settings\###\my documents\visual studio 2008\projects\play_sound\play_sound\dsutil.cpp(686) : error C2065: 'i' : undeclared identifier
c:\documents and settings\###\my documents\visual studio 2008\projects\play_sound\play_sound\dsutil.cpp(687) : error C2065: 'i' : undeclared identifier
Build log was saved at "file://c:\Documents and Settings\###\My Documents\Visual Studio 2008\Projects\Play_Sound\Play_Sound\Debug\BuildLog.htm"
Play_Sound - 2 error(s), 0 warning(s)
========== Build: 0 succeeded, 1 failed, 0 up-to-date, 0 skipped ==========
 

]

And the exact lines that have this problem are

LPDIRECTSOUNDBUFFER CSound::GetFreeBuffer()
{
    if( m_apDSBuffer == NULL )
        return FALSE; 
 
    for( DWORD i=0; i<m_dwNumBuffers; i++ )
    {
        if( m_apDSBuffer[i] )
        {  
            DWORD dwStatus = 0;
            m_apDSBuffer[i]->GetStatus( &dwStatus );
            if ( ( dwStatus & DSBSTATUS_PLAYING ) == 0 )
                break;
        }
    }
 
    if( i != m_dwNumBuffers )
        return m_apDSBuffer[ i ];
    else
        return m_apDSBuffer[ rand() % m_dwNumBuffers ];
}
 

the frustrating part is that it isn't my code...
and it's too complicated for me to figure out, i was thinking it was something with the braces and the "i" not being a identified in the "if" statement, although the program worked when i changed their location, there was no sound :(

kind regards,
Netwatcher.

[JosAH]

Change your lines #5 and #6 to this:

DWORD i;
for( i=0; i<m_dwNumBuffers; i++ ) 
 

kind regards,

Jos

[Netwatcher]

Well it did exactly what i did :p
But! it helped me find the real bug...
debugging is a nasty process!
Thanks :D

[JosAH]

@Netwatcher
Better be prepared then because this was an easy compile time bug: when you define a variable in the header part of a for loop that variable only exists in the scope of the for header and body; outside of that scope that variable simply doesn't exist. Note that very old C++ compilers made the variable exist in the block part following the for loop body; that was just a silly decision and has been corrrected.

kind regards,

Jos

[Netwatcher]

("Beginning Game Programming, Second edition"-chapter 9)
I take it back...
I'm using IBM T42 Thinkpad with with default hardware & newest Audio Drive
The program loads A-okay but no sound whatever what i do :( can it be that
My Audio hardware is not compatible with the DXaudio(using dsutil.cpp/h) lib? (i CAN play wav files with normal audio players)