在Windows資源瀏覽器中，可在DVD/CD光驅(qū)圖標(biāo)上單擊鼠標(biāo)右鍵，選擇"彈出"來(lái)打開(kāi)光驅(qū)倉(cāng)門，你可能也發(fā)現(xiàn)了，菜單中并沒(méi)有"關(guān)閉"命令來(lái)關(guān)閉光驅(qū)。下面，就讓我們用程序來(lái)控制打開(kāi)、關(guān)閉光驅(qū)。
程序的主要工作部分為CD_OpenClose(BOOL bOpen, TCHAR cDrive)函數(shù)：
1 //cDrive是光驅(qū)盤符，或者0x01為默認(rèn)驅(qū)動(dòng)器。
2 //例如：
3 //CD_OpenCloseDrive(TRUE, 'G'); //打開(kāi)光驅(qū)G:
4 //CD_OpenCloseDrive(FALSE, 'G'); //關(guān)閉光驅(qū)G:
5 //CD_OpenCloseDrive(TRUE, 1); //打開(kāi)第一個(gè)邏輯光驅(qū)
6
7 void CD_OpenCloseDrive(BOOL bOpenDrive, TCHAR cDrive)
8 {
9 MCI_OPEN_PARMS op;
10 MCI_STATUS_PARMS st;
11 DWORD flags;
12
13 TCHAR szDriveName[4];
14 strcpy(szDriveName, "X:");
15
16 ::ZeroMemory(&op, sizeof(MCI_OPEN_PARMS));
17 op.lpstrDeviceType = (LPCSTR) MCI_DEVTYPE_CD_AUDIO;
18
19 if(cDrive > 1)
20 {
21 szDriveName[0] = cDrive;
22 op.lpstrElementName = szDriveName;
23 flags = MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID | MCI_OPEN_ELEMENT| MCI_OPEN_SHAREABLE;
24 }
25 else flags = MCI_OPEN_TYPE | MCI_OPEN_TYPE_ID | MCI_OPEN_SHAREABLE;
26
27 if (!mciSendCommand(0,MCI_OPEN,flags,(unsigned long)&op))
28 {
29 st.dwItem = MCI_STATUS_READY;
30
31 if(bOpenDrive)
32 mciSendCommand(op.wDeviceID,MCI_SET,MCI_SET_DOOR_OPEN,0);
33 else
34 mciSendCommand(op.wDeviceID,MCI_SET,MCI_SET_DOOR_CLOSED,0);
35
36 mciSendCommand(op.wDeviceID,MCI_CLOSE,MCI_WAIT,0);
37 }
38 }
為了方便對(duì)多個(gè)光驅(qū)進(jìn)行操作，添加了下面這個(gè)函數(shù)，其會(huì)調(diào)用上面的CD_OpenCloseDrive()函數(shù)：
1 void CD_OpenCloseAllDrives(BOOL bOpenDrives)
2 {
3 //判定所有光驅(qū)，并逐個(gè)打開(kāi)或關(guān)閉。
4 int nPos = 0;
5 UINT nCount = 0;
6 TCHAR szDrive[4];
7 strcpy(szDrive, "?:");
8
9 DWORD dwDriveList = ::GetLogicalDrives ();
10
11 while (dwDriveList) {
12 if (dwDriveList & 1)
13 {
14 szDrive[0] = 0x41 + nPos;
15 if(::GetDriveType(szDrive) == DRIVE_CDROM)
16 CD_OpenCloseDrive(bOpenDrives, szDrive[0]);
17 }
18 dwDriveList >>= 1;
19 nPos++;
20 }
21 }
最后一點(diǎn)，別忘了在程序開(kāi)頭包括Mmsystem.h頭文件，及在鏈接選項(xiàng)里寫上Winmm.lib。