114 lines
2.6 KiB
C++
114 lines
2.6 KiB
C++
/*++
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Copyright (c) 2001 Microsoft Corporation
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Module Name:
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NewShenDiaoXiaLv.cpp
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Abstract:
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On NT, when there is no CD in the CDROM, and the app sends a MCI_OPEN
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command to the CDAUDIO device, the app has fully exclusive control of the
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CDROM. When later on user inserts CD, the app will not receive
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WM_DEVICECHANGE message. And this app relies on the message to know if
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there is a new CD inserted.
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The fix is check whether the CD is there when we do MCI_OPEN command, if
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there is not CD, we will close the device.
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Notes:
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This is an app specific shim.
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History:
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05/28/2001 xiaoz Created
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--*/
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#include "precomp.h"
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IMPLEMENT_SHIM_BEGIN(NewShenDiaoXiaLv)
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#include "ShimHookMacro.h"
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APIHOOK_ENUM_BEGIN
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APIHOOK_ENUM_ENTRY(mciSendCommandA)
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APIHOOK_ENUM_END
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/*++
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Close the device if we get hardware error(CD is not there).
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--*/
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MCIERROR
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APIHOOK(mciSendCommandA)(
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MCIDEVICEID IDDevice,
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UINT uMsg,
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DWORD fdwCommand,
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DWORD dwParam
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)
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{
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MCIERROR mciErr, mciError;
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MCI_STATUS_PARMS mciStatus;
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LPMCI_OPEN_PARMSA lpmciOpenParam;
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CString cstrDeviveType;
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mciErr = ORIGINAL_API(mciSendCommandA)(IDDevice, uMsg, fdwCommand, dwParam);
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// We are only interested in a successful MCI_OPEN Message
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if (mciErr || (uMsg != MCI_OPEN) || IsBadReadPtr((CONST VOID*)(ULONG_PTR)dwParam, 1))
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{
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goto End;
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}
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// We are only interested in MCI message sent to CDAUDIO
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lpmciOpenParam = (LPMCI_OPEN_PARMSA) dwParam;
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if ((ULONG_PTR) lpmciOpenParam->lpstrDeviceType <= 0xffff)
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{
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if ((ULONG_PTR)lpmciOpenParam->lpstrDeviceType != MCI_DEVTYPE_CD_AUDIO)
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{
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goto End;
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}
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}
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else
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{
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CString cstrDeviveType(lpmciOpenParam->lpstrDeviceType);
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if (cstrDeviveType.CompareNoCase(L"cdaudio"))
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{
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goto End;
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}
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}
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// Send an MCI_STATUS
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mciStatus.dwItem = MCI_STATUS_LENGTH ;
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mciError = mciSendCommandA(lpmciOpenParam->wDeviceID, MCI_STATUS,
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MCI_STATUS_ITEM | MCI_TRACK | MCI_WAIT, (DWORD_PTR) &mciStatus);
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if (MCIERR_HARDWARE == mciError)
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{
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//
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// If we get hardware error, it means CD is not there, close the device
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// and return error
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//
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mciSendCommandA(lpmciOpenParam->wDeviceID, MCI_CLOSE, 0, 0);
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mciErr = MCIERR_DEVICE_NOT_READY;
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}
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End:
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return mciErr;
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}
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/*++
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Register hooked functions
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--*/
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HOOK_BEGIN
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APIHOOK_ENTRY(WINMM.DLL, mciSendCommandA)
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HOOK_END
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IMPLEMENT_SHIM_END
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