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CD Player Mute Button Borland C++ 4

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Just wondering does anyone out there know whats wrong with this code. Im using the and any help would be greatly appreciated. void __fastcall TNetworkCDPlayerApplication::MuteButtonClick(TObject *Sender) { MCI_SET_PARMS mciSetParms; ZeroMemory(&mciSetParms, sizeof(MCI_SET_PARMS)); mciSetParms.dwAudio = MCI_SET_AUDIO_ALL; mciSendCommand(m_DeviceID, MCI_SET, MCI_SET_OFF, (DWORD)(LPVOID) &mciSetParms); MuteButton->Visible = false; UnmuteButton->Visible = true; }

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