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Opening/closing CD-Drive

Posted on 1997-03-16
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Last Modified: 2010-04-04
I know how to open and close a CD-drive, but I like to be able to choose between two available drives. How do I choose which device to open with MciSendCommand??

CD-Drives: F and G

I need to know how to open G
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Question by:OAM
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6 Comments
 
LVL 3

Expert Comment

by:sperling
ID: 1334918
 FillChar(OpenParms, SizeOf(OpenParms), 0);
  OpenParms.lpstrDeviceType :=
    POINTER(MCI_DEVTYPE_CD_AUDIO + 1 shl 16);

// High word is device number      ^

  Error := mciSendCommand(MCI_DEVTYPE_CD_AUDIO,
    MCI_OPEN,
    MCI_OPEN_TYPE or MCI_WAIT
   
    or MCI_OPEN_TYPE_ID
// Indicate that we specify an device number  

    or MCI_OPEN_SHAREABLE,
    INTEGER(@OpenParms));


This code should work according to my docs.
I cannot test it, as I ain't got any machines with to CD's...

Erik.
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Author Comment

by:OAM
ID: 1334919
Edited text of question
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Author Comment

by:OAM
ID: 1334920
Didn't work the way it was suppose to.

Not enough comments (It is a 100 point question)
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LVL 3

Expert Comment

by:sperling
ID: 1334921
What OpenParms did you use, and what errors did you get?

Regards,

Erik.
0
 

Author Comment

by:OAM
ID: 1334922
Well I't didn't work.

OpenParms.lpstrDeviceType :=                                          POINTER(MCI_DEVTYPE_CD_AUDIO + 1 shl 16);

It is not too clear to me what this is suppose to do.



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LVL 3

Accepted Solution

by:
sperling earned 200 total points
ID: 1334923
procedure TForm1.Button1Click(Sender: TObject);
var
  Error      : INTEGER;
  a          : ARRAY [0..199] OF CHAR;
begin
  Error := mciSendString('open cdaudio1', a, SizeOf(a), 0);
  mciGetErrorString(Error, a, SizeOf(a));
  Label1.Caption := StrPas(a);
end;

This should work.

> POINTER(MCI_DEVTYPE_CD_AUDIO + 1 shl 16)

According to docs, the high-order word of this pointer indicates the ordinal number of the device. "X shl 16" sets the high order word to X... But then, it didn't work... Kind of hard to find this out, as I haven't got two of any MCI devices on any of my pcs...


Regards,

Erik.
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