Solved

Need to Find Path to CD Rom for System() Command

Posted on 2002-03-05
7
219 Views
Last Modified: 2010-04-01
I am writing an application to be burned on a CD that needs to access other files on the same CD.  For instance, one application on this CD needs to open a .html file also located on the same CD.  For testing purposes, I am using ...

system("index.html");

but this only works with the c: drive.  Obviously, I can also type c:/temp/index.html or whatever the path may be.  However, this application is going to be used on many different computers.  Many computers have the CD as drive d: but also many have it as a drive e: or drive f:. Somehow, I need to find the path to the current user's CD drive and then use that path within the system() command.  NOTE: The system() command uses a const char * as a parameter and I have not been able to figure out how to use a variable instead of a string as shown above.  When I try to use a variable ...
     const char *temp1 = "c:/temp/acrord32.exe";
     system("temp1");
a message tells me that temp1 is not recognized as a internal or external command or operable program.
However, system("c:/temp/acrord32.exe");  works fine.  
Question is:  How do I find the path of the CD ROM and then get that path to work in the system command?  I am assuming that I will need a variable for the path so I can add the path to my application.
0
Comment
Question by:guile1
  • 5
7 Comments
 
LVL 86

Accepted Solution

by:
jkr earned 300 total points
ID: 6843151
You usually would use "GetDriveType()":

char Get1stCDDriveLetter() {

 char c = 'a';
 char acRoot [ MAX_PATH];

 while ( 1){
   sprintf ( acRoot, "%c:\\", c),

   if ( DRIVE_CDROM == GetDriveType ( acRoot)) {
        return ( c);
   }

   c++;
  }

 return 0;
}

This will return the CDROm drive letter...
0
 
LVL 86

Expert Comment

by:jkr
ID: 6843152
Oh, and you would use it like

const char *temp1 = "%c:/temp/acrord32.exe";

char acPath [ MAX_PATH];

sprintf ( acPath, temp1, Get1stCDDriveLetter());

system ( acPath);
0
 
LVL 86

Expert Comment

by:jkr
ID: 6843165
Wait a minute - is your app already started from the CD? If so, it would be easier to use "GetModuleFileName ( NULL)" and use that information...
0
Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

 
LVL 86

Expert Comment

by:jkr
ID: 6843173
Ooops, BTW, make

char c = 'a';

read

char c = 'd';

I think we can safely assume that :o)
0
 

Author Comment

by:guile1
ID: 6843180
Very good!  Thanks.
0
 
LVL 1

Expert Comment

by:jdrescher
ID: 6843823
>Wait a minute - is your app already started from the CD? If so, it would be easier to use "GetModuleFileName
( NULL)" and use that information...

Yes. You better use this instead, because the user may have more than one cdrom drive. My server has three..
0
 
LVL 86

Expert Comment

by:jkr
ID: 6845029
>>because the user may have more than one cdrom drive

That's why the function is named 'Get1stCDDriveLetter()' :o)
0

Featured Post

Free Tool: Port Scanner

Check which ports are open to the outside world. Helps make sure that your firewall rules are working as intended.

One of a set of tools we are providing to everyone as a way of saying thank you for being a part of the community.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Written by John Humphreys C++ Threading and the POSIX Library This article will cover the basic information that you need to know in order to make use of the POSIX threading library available for C and C++ on UNIX and most Linux systems.   [s…
Many modern programming languages support the concept of a property -- a class member that combines characteristics of both a data member and a method.  These are sometimes called "smart fields" because you can add logic that is applied automaticall…
The viewer will learn how to use the return statement in functions in C++. The video will also teach the user how to pass data to a function and have the function return data back for further processing.
The viewer will learn how to user default arguments when defining functions. This method of defining functions will be contrasted with the non-default-argument of defining functions.

856 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question