topic Re: Read text line and save values into array in LabWindows/CVI

Read text line and save values into array

Chocobombo — Fri, 28 Sep 2012 14:17:15 GMT

Hello,

maybe it sounds so stupid, but i have frustrated for hours with this task.

i have a text file, which containts data which following format:

Reg1_name 08DE 23234

Reg2_name 09DE 13827

Reg3_name 0ADE 19283

.....

i want to read the line and save the values at the end of each line into an array.

My code:

char reg_name_tmp;

unsigned int reg_add_hex_tmp;
unsigned int reg_val_tmp;

char reg_name[19];
unsigned int reg_add_hex[19];
unsigned int reg_val[19];

file_handle = fopen (file_path, "r");

while(fgets(file_line,200,file_handle)!=NULL)
               {
                   Scan(file_line,"%s   %x   %d",&reg_name_tmp ,&reg_add_hex_tmp,&reg_val);
                   reg_val_int[counter++] = reg_val_int_tmp;
               }

There was always error.

Can somebody help me ?

Re: Read text line and save values into array

Wolfgang — Fri, 28 Sep 2012 14:29:01 GMT

What error?

Re: Read text line and save values into array

Chocobombo — Fri, 28 Sep 2012 14:36:09 GMT

i got : NON FATAL RUN TIME ERROR: Attempt to write beyond end of string.

Re: Read text line and save values into array

Wolfgang — Fri, 28 Sep 2012 14:49:48 GMT

If you have an error message, you can try to get some explanation in the help, see http://zone.ni.com/reference/en-XX/help/370051V-01/cvi/libref/cviruntime_errors_and_warnings/ It will tell you that your output array is smaller than the given format specifiers and input parameters require;

In the given code there is only one place with a format specifier, and only one instance of a string: You have

char reg_name_tmp;

but this is a single character while you probably want to read the string 'Reg1_name'... Try to use reg_name instead...

(If you report an error in the future is it even better to specify the line where the error occurs, it may not always be obvious )

Re: Read text line and save values into array

Chocobombo — Fri, 28 Sep 2012 14:50:51 GMT

hi, thank for ur replies.

i have found a work around by using "strtok"

Here is the code, in case somebody interests

char * token;

               file_handle = fopen (file_path, "r");
               while(fgets(file_line,100,file_handle)!=NULL)
               {

                   unsigned int intern_cnt = 0;
                   token = strtok(file_line,"\t");
                   while(token != NULL)
                   {
                       token = strtok(NULL,"\t");
                       intern_cnt++;
                       if(intern_cnt == 2)
                           reg_val_int[counter++] = atoi(token);
                   }

               }

Re: Read text line and save values into array

RobertoBozzolo — Fri, 28 Sep 2012 14:55:43 GMT

...or more simple:

counter = 0;
while (fgets (file_line, 200, file_handle) != NULL)
{
Scan (file_line, "%s[xt32]%x[x]%d", reg_name, &reg_add_hex_tmp, &reg_val[counter++]);
}