Some qs...

Doomulation said:

Ok, just wondering some things. Anyway,

1) Is there a good API to get the cdrom drive?
2) Is there a way to convert char to char*? As in the following illustrated sample:

Click to expand...

There is api to determine if the drive is a cdrom, but you cannot get detailed information on it, you need aspi for that.

Here is some code from one of my projects, darkengine, hope it helps.

you mixed up the arguments of strcpy

the first argument is the destination and the 2nd argument is the string that you want to copy

Doomulation said:

Ok, just wondering some things. Anyway,

2) Is there a way to convert char to char*? As in the following illustrated sample:

Code:

char drive = 'D';
char* temp = new char[3];
while (true)
{
  strcpy(drive,temp); // Compile error: cannot convert char to char*
  strcpy((char*)drive,temp); // No compile error, but data is lost
  strcpy((char*)&drive,temp); // Would this work?
  strcat(":\\",temp);
  drive++;
}

Click to expand...

as teamz said you've mixed the destination and the source in the strcpy() funtion. The last one is correct, but you could also do it like this since you're only accessing one char:
temp[0] = drive;

3) While I'm at it...has anyone experienced that the compiler/linker hangs sometimes and the stop build command fails?

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Atleast using DJGPP on win2000 the ntvdm.exe fails like 10% of the time compilation/linking. But VC++ 6.0 SP3 hasn't failed on me yet lain:

Doomulation said:

2) Is there a way to convert char to char*? As in the following illustrated sample:

Click to expand...

Answering only the question you asked and not pointing out any other problems with that code... :happy:

As the two other posters already mentioned, the arguments for strcpy() are back to front. You'll find that pretty much all the basic ANSI C functions put their parameters in the (destination, source) order.

Another, more serious, problem has to do with the assumption that you only need to convert from char to char*. The simple answer to the question is "&drive" (you don't need the typecast). BUT, doing this for an argument to strcpy() is wrong. The function strcpy() doesn't just want a char*, it wants a char* that points to a array of chars with the last element being 0x00 (a null terminating string, another words). &drive is just one char with no terminator, so strcpy() will overflow the array bounds while searching for the end of the string.

The safe answer is, you need a temporally buffer:

But in your example, you can just do:
Note: 'temp' needs to be at least FOUR chars in size (not three), to cater for the null terminator.

3) While I'm at it...has anyone experienced that the compiler/linker hangs sometimes and the stop build command fails?

Click to expand...

Sometimes. Don't know what causes it though. I assume it's just MS's shoddy old IDE. (VC++ 6.0)