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I have looked and looked, but I can't find any code to eject a CD-ROM drive in Windows (9x or 2000). I have found a few programs that can do it, but I really need to implement the code inside my project myself. I noticed that the Windows Media Player SDK has some functionality that will do that, but I do not want to be dependent on those libraries to do this. Does anyone have some simple code to do this?
Thanks!
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DeviceIoControl can be used to do this.
Ed
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This was tested on Win2000 and WinNT. mciSendString is available on all 32-bit Windows versions, so you should have no problems on Win9X.
char buf[256];
mciSendString("open f: type cdaudio alias myAlias", buf, sizeof(buf), NULL);
mciSendString("set myAlias door open", buf, sizeof(buf), NULL);
mciSendString("set myAlias door closed", buf, sizeof(buf), NULL);
Tomasz Sowinski -- http://www.shooltz.com.pl
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Works great (though for SOME reason I was getting really weird errors in the Mmsystem.h, had to redefine UINT, then it was missing Winmm.lib). One question: is there a way to do this without waiting? IE: The program sends the message to close the CD then quits immediately. Right now, as is, it waits for the drive to fully close, and read info about the CD before the last mciSendString executes.
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If it's because you want your program to go on with it's business, instead of waiting, just do the open/close stuff in another thread...
- Anders
Money talks, but all mine ever says is "Goodbye!"
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Sure, I figured that was the easiest way to do it, I was just curious to know if there was a way to do it without waiting without relying on a separate thread. I will be opening and closing the drive several times during execution, but at the end of execution it ejects the CD for the user to remove and then quits. I would like to to eject, request that the user remove the CD, and then close the drive, but not wait for the drive after closing. Using a separate thread would still keep the program alive.
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You have the mciSendCommand function.
With this function you can send command messages to MCI devices.
Carlos Antollini.
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Hi
I have a function in my CView class, it takes a point, and returns the pixel intensity
when I compile it, there's no problem with it,, but there's no output file...
Can anyone help me out????
COLORREF CTestEdgeView::GetPoints( )
{
//this is the class which detects the firt point on the boarder
CClientDC dc(this);
test = dc.GetPixel(m_ptCenter.x +1 , m_ptCenter.y);
ofstream outfile ("ftest.out");
outfile <<"the intensity is: "<< test;
outfile.is_open();
return test;
}
Thanks
Ehsan Behboudi
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Assuming the code works OK, I suspect "ftest.out" is being generated in the default directory (whatever that may be at run time). You might want to retry using a fully qualified filespec like "C:\\ftest.out".
/ravi
"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com
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Is it possible to build a string with a class name and then create a C++ object of that type using some kind of rtti?
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like this?
CBaseClass *pObj = NULL;
file.ReadString(className);
if (className == ClassA::SerializationName)
pObj = new ClassA;
else if (className == ClassB::SerializationName)
pObj = new ClassB;
-c
------------------------------
Smaller Animals Software, Inc.
http://www.smalleranimals.com
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Make your objects COM objects. This way you can look them up based on the ProgID.
CLSIDFromProgID( L"ClassName", &clsid );
hr = CoCreateInstance( clsid, NULL, CLSCTX_ALL,
__uuidof(IClass), (void **) &pIClass );
This has the benefit of not needing to do some big if statement and adding a new string every time a new class is added.
Mike
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You can pick some ideas from this article by Allen Holub:
http://msdn.microsoft.com/library/periodic/period96/S385.htm
Tomasz Sowinski -- http://www.shooltz.com.pl
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Hi, I'm searchig for a routine for Authenticating users that dial to a NT4/2000 server, using RADIUS protocol, because users passe through a router that server is connected to it.
Please help me.
Regards,
HAMED.
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Hello!
The fact: I created a program with mfc the access an .mdb database through a Regular MFC DLL
statically linked (i must do that). I add th DLL to my core program, i execute all the function,
like insertion of record, etc through the dialogs in DLL and the db in the DLL.
When i close the app i always get an error cause "the memory could not be read". All works fine
but this message box.
This, only when i use CDaoRecordset (that i must use instead of CRecordset), cause when i call a
function that show ie a message box, the memory error dont appear.. sigh
Anyone has an idea on how to kill this problem?
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Have you tried rebuilding the entire project? ( i.e. Clean / Rebuild all )
If putting a MessageBox in will make the problem go away, then it is quite likely that the program's stack is corrupted. You also need to make sure that the .lib file you are statically linking with is up to date. i.e. build the dll first, then use the up to date .lib file to build the executable. The joys of statically linking.
"Harland Pepper, would you stop naming nuts" - Harland Pepper
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I have a need to build a string as follows; "DOMAINNAME\USERID". In looking through the MSDN docs on networking it appears that I can use the API function NetWkstaUserGetInfo(). The docs say you have to include the header lmwksta.h. When you do this and compile, that header causes a compile error and inside it's documentation it says you must include netcons.h before you include this file. Unfortunately that file, netcons.h, does not exist on my PC anywhere.  I've tried searching for variations on the name but have still come up empty. Does anyone have a thought on what might be broken? Or another way for me to put this particular string together. Thanks.
Chris
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You only need the header lm.h and do not forget to link with the Netapi32.lib library.
Cheers!!!
Carlos Antollini.
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Thanks Carlos. With some more searching I found that there is a header file called lmcons.h. And in this file is a comment that it used to be called .. .. .. ta da. NETCONS.H
But I like your suggestion better. Just include lm.h and I should get all that will need. Thanks again.
Chris
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How to detect the IP of the computer the programm is working on? ![Rose | [Rose]](https://codeproject.global.ssl.fastly.net/script/Forums/Images/rose.gif)
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void CGetIPDlg::GetIP()
{
WORD wVersionRequested;
WSADATA wsaData;
char name[255];
CString ip;
PHOSTENT hostinfo;
wVersionRequested = MAKEWORD( 2, 0 );
if ( WSAStartup( wVersionRequested, &wsaData ) == 0 )
{
if( gethostname ( name, sizeof(name)) == 0)
{
if((hostinfo = gethostbyname(name)) != NULL)
{
ip = inet_ntoa (*(struct in_addr *)*hostinfo->h_addr_list);
}
m_IP.SetWindowText(ip);
UpdateData(FALSE);
}
WSACleanup( );
}
}
<pre>
BLaZe
ICQ # 110244345
email : mpblaze@iquebec.com
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How can I set the background color of a CView derived class(to black for example), without doing something silly like drawing a view-spanning rectangle in OnDraw() 
cheers
Bilal
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Handle the WM_ERASEBKGND message. Inside the handler, use PatBlt to fill the window with desired color.
BOOL CYourView::OnEraseBkgnd(CDC* pDC)
{
CBrush backBrush(RGB(0, 0, 0));
CBrush* pOldBrush = pDC->SelectObject(&backBrush);
CRect rc;
pDC->GetClipBox(&rc);
pDC->PatBlt(rc.left, rc.top, rc.Width(), rc.Height(), PATCOPY);
pDC->SelectObject(pOldBrush);
return TRUE;
}
Tomasz Sowinski -- http://www.shooltz.com.pl
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Hi!!!
How it is possible that the following application had 1 thread when is running on Win NT and 2 when is running on Win2000!?
// TestWin2000.cpp : Defines the entry point for the console application.
//
#include <winsock2.h>
#include <stdio.h>
int main(int argc, char* argv[])
{
WSAData wsData;
::WSAStartup(0x0202,&wsData);
char name[64];
gethostbyname((char*)name);
WSACleanup();
printf("\n");
return 0;
}
TIA,
Carlos Marcão
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