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string comparison error

 
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pasini



Joined: 12 Dec 2005
Posts: 50
Location: Curitiba - Brazil

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string comparison error
PostPosted: Thu Dec 14, 2006 6:52 pm     Reply with quote
MPLAB 7.41 CCS 4.005 PIC18F2550
Hi all,
I am just trying to compare a string to a constant but I am receiving 2 compiler errors:
1) attempt to create a pointer to a constant
2) a numeric expression must appear here

The error is here:
Code:

#include <STDLIB>
#include <stdlibm.h>
#include <string.h>
//char bufrx[100];
char *bufrx;
bufrx = malloc(100);
if(strcmp(bufrx,"AT   ")==0)   // equals   <<<--- the error is in this line
{   memset(bufrx,0,pointer);
                pointer=0;
}


I declared bufrx both as a char matrix and a pointer with malloc allocation. Both return the same errors.
I also tried to create my own compare_strings_ function similar to strcmp but a similar error appeared when I declared the function.
What am I missing ?

Thanks in advance for any help
Pasini
PCM programmer



Joined: 06 Sep 2003
Posts: 21708

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PostPosted: Thu Dec 14, 2006 8:02 pm     Reply with quote
You must copy the constant string to a RAM buffer first.
See my post near the end of this thread for an example:
http://www.ccsinfo.com/forum/viewtopic.php?t=24212
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