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Help with variables...

Posted on 2006-11-06
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Last Modified: 2010-04-24
I'm having issues with variables...

I am trying to load some configuration information from a text file and use it elsewhere in my application.

Here are snipets from the code:

char * CIP = "000.000.000.000";
char* IpAddress = CIP;

errno_t err;

if ((err = fopen_s(&instream, "config.txt", "r")) != 0)
{
      Memo1->AppendText("Configuration file failed to open.\r\n");
}
else
{
      Memo1->AppendText("Configuration file successfully opened.\r\n");
                        
      fscanf(instream, "%s\n", CIP);
}

I am getting an "attempted to read or write to protected memory" error when compiling. I know this has to do with pointers and such, but I've never been good with them and I'm stumpted on this one.

I am not able to change the CIP decleration or usage as the other 2000 lines of code work with it as it is. What I need is the read the first line of the text file and then assign that information to the CIP variable.

Any help you be appreciated as this problem is urgent...
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Question by:demilune
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4 Comments
 
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Accepted Solution

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sunnycoder earned 2000 total points
ID: 17887330
Hi demilune,

Change char * CIP = "000.000.000.000";
to
char CIP[] = "000.000.000.000";

String literals are often stored in read only memory ... by declaring it as array, you would be storing it in R/W memory (stack if declarede locally and data segment if declared globally)

Cheers!
sunnycoder
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Expert Comment

by:sunnycoder
ID: 17887333
>I am not able to change the CIP decleration or usage as the other 2000 lines of code work with it as it is.
This change should not affect your existing code. ... give it a shot
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Author Comment

by:demilune
ID: 17887346
THANKS THANKS THANKS...

I knew I was missing something simple like that. I had not realized literals were stored read only.

Thanks again!
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LVL 45

Expert Comment

by:sunnycoder
ID: 17887435
Glad to help :)
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