Clearing a string variable

eshimshi · July 18, 2010, 17:07

How can I clear a string variable in udf?
mystring="";
or
mysring='\0';
or
mystring[0]='\0',
don't work
Any ideas?

DoHander · July 18, 2010, 18:54

char aux[20];
int i,n;
strcpy(aux,"propusaurus");
printf("%s\n",aux);
n=strlen(aux);
for(i=0;i<n;i++)aux[i]=' ';
printf("%s\n",aux);
printf("%d\n",n);

eshimshi · July 20, 2010, 12:37

I tried it.
Unfortunately it didn't help.
Using:
for(i=0;i<n;i++)aux[i]=' ';
just replaces the characters with spaces.
when i append chars to the string with:
strcat(aux,"-t.txt");
it adds them to the end of the spaces so that with each loop it gets longer.
I need a way to reset the counter of the string.

DoHander · July 20, 2010, 20:32

I think I know what you want, try this piece of code:

========================
int i,n;
strcpy(aux,"propusaurus");
printf("Content = %s\tLength = %d\n",aux,strlen(aux));

/*Empty the string, reset the counter to 0*/
strcpy(aux,"");
printf("Content = %s\tLength = %d\n",aux,strlen(aux));

========================================

The call to strcpy will replace what is in aux with an empty string, the counter will be reset to 0, if you apply strlen you will see the empty string has zero characters in it.

Hope this will help,

Do

July 18, 2010, 17:07	Clearing a string variable	#1
eshimshi New Member Join Date: Apr 2009 Posts: 9 Rep Power: 17	How can I clear a string variable in udf? mystring=""; or mysring='\0'; or mystring[0]='\0', don't work Any ideas?

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July 18, 2010, 18:54		#2
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 20	char aux[20]; int i,n; strcpy(aux,"propusaurus"); printf("%s\n",aux); n=strlen(aux); for(i=0;i<n;i++)aux[i]=' '; printf("%s\n",aux); printf("%d\n",n);

July 20, 2010, 12:37		#3
eshimshi New Member Join Date: Apr 2009 Posts: 9 Rep Power: 17	I tried it. Unfortunately it didn't help. Using: for(i=0;i<n;i++)aux[i]=' '; just replaces the characters with spaces. when i append chars to the string with: strcat(aux,"-t.txt"); it adds them to the end of the spaces so that with each loop it gets longer. I need a way to reset the counter of the string.

July 20, 2010, 20:32		#4
DoHander Senior Member Join Date: Nov 2009 Posts: 411 Rep Power: 20	I think I know what you want, try this piece of code: ======================== int i,n; strcpy(aux,"propusaurus"); printf("Content = %s\tLength = %d\n",aux,strlen(aux)); /Empty the string, reset the counter to 0/ strcpy(aux,""); printf("Content = %s\tLength = %d\n",aux,strlen(aux)); ======================================== The call to strcpy will replace what is in aux with an empty string, the counter will be reset to 0, if you apply strlen you will see the empty string has zero characters in it. Hope this will help, Do