Question

直升机，

我一直在测试一个检测CD / DVD版insertion/removal的c ++代码。我测试的代码非常适合检测CD / DVD的插入/删除。

但是我想扩展此代码以检测启动期间CD / DVD托盘中是否已有印版。任何想法我如何扩展此代码以在启动期间检查这个？我到目前为止测试的代码如下：

  char FirstDriveFromMask(ULONG unitmask)
{

char i;
for (i = 0; i < 26; ++i)
{
    if (unitmask & 0x1)
        break;
    unitmask = unitmask >> 1;
}
//cout << "dd" << (i + 'A');
return(i + 'A');
}




   LRESULT CALLBACK WinProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{

    PDEV_BROADCAST_HDR lpdb = (PDEV_BROADCAST_HDR)lParam;
    TCHAR szMsg[80];


        switch (wParam)
        {
        case DBT_DEVICEARRIVAL:
            // Check whether a CD or DVD was inserted into a drive.
            if (lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
            {
                PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;

                //check which letter is the new device
                if (lpdbv->dbcv_flags & DBTF_MEDIA)
                {                       
                    cout << "CD/DVD has been inserted in: " << FirstDriveFromMask(lpdbv->dbcv_unitmask) <<" drive"<<endl;
                }
            }
            break;

        case DBT_DEVICEREMOVECOMPLETE:
            // Check whether a CD or DVD was removed from a drive.
            if (lpdb->dbch_devicetype == DBT_DEVTYP_VOLUME)
            {
                PDEV_BROADCAST_VOLUME lpdbv = (PDEV_BROADCAST_VOLUME)lpdb;

                if (lpdbv->dbcv_flags & DBTF_MEDIA)
                {                                   
                    cout << "CD/DVD has been removed from: " << FirstDriveFromMask(lpdbv->dbcv_unitmask) << " drive" << endl;
                }
            }
            break;
        default:
            /*
            Process other WM_DEVICECHANGE notifications for other
            devices or reasons.
            */
            ;
        }


    return 1;
}//WinProc

用于检测CD / DVD-ROM内部媒体的C ++代码

0 个答案: