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Guest
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| #define a string |
 Posted: Sat Aug 27, 2005 3:40 pm |
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Is this permitted? #define string (char*)"hi"
If not, any suggestions? |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Sat Aug 27, 2005 4:43 pm |
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| pointers to constants are not allowed. |
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Guest
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| Posted: Sat Aug 27, 2005 4:55 pm |
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| would you happen to have a suggestion to perform a string compare against a string that is not allowed to changed? ie if(strcmp(guess, my permanent strig) then do something |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Sat Aug 27, 2005 5:20 pm |
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| Look in the help file for strcmp(). You will find an example for strcat() that can be used for your problem. |
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Guest
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| Posted: Sat Aug 27, 2005 5:49 pm |
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| Thank you for the suggestion. Please forgive me but I don't understand how concatenation can solve the problem? could you please give an example? |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Sat Aug 27, 2005 9:44 pm |
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In CCS, the strcmp() function on works with strings that are in ram arrays.
So, if you have a constant string, you need to copy it into a ram array
by using the special CCS function, strcpy(). Then you can use strcmp().
| Code: | #include <16F877.H>
#fuses XT, NOWDT, NOPROTECT, BROWNOUT, PUT, NOLVP
#use delay(clock = 4000000)
#use rs232(baud=9600, xmit=PIN_C6, rcv=PIN_C7, ERRORS)
const char Hello_string[] = "Hello"; // This string is in ROM
char temp[20];
//======================================
void main()
{
strcpy(temp, Hello_string); // Copy const string into ram array
// Now you can use strcmp() to compare temp to another array.
// Put your strcmp() code here.
while(1);
} |
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Mark
Joined: 07 Sep 2003
Posts: 2838
Location: Atlanta, GA
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| Posted: Sun Aug 28, 2005 2:13 am |
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| Anonymous wrote: | | Thank you for the suggestion. Please forgive me but I don't understand how concatenation can solve the problem? could you please give an example? |
It can't but if you look at the example and think just a bit you will see that you can apply the same principle but instead of strcat() do your strcmp()! |
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Guest
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| Posted: Sun Aug 28, 2005 11:31 am |
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Thanks,
Eric |
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