Writing values to new rows in a .csv file in C

Question

I apologize for this seemingly relatively simple task that I can't figure out. I wasn't able to seem to find a way to write data to a new row in a .csv file using the C language. I'm saving 3 variables to the .csv file, and currently they will always replace A1:C1. Here is my print commands:

fs = fopen("C:\\Documents and Settings\\ajkaas\\Desktop\\110c.csv", "w"); if(fs == NULL){ printf("Couldn't open file\n"); return; } fprintf(fs, "%u,%11.8f,%11.8f\n", message63->rcvrBitErrorCount, (double)message63->rcvrTotalBitErrorCount / (double)(message63->rcvrBlockIndex * message63->rcvrBitsPerBlock), (double)message63->rcvrBlockErrorCount / (double)(message63->rcvrBlockIndex)); fclose(fs);

I know that looks messy, and I apologize for that as well. I was looking at some documentation but couldn't seem to find an answer. Every time the for loop runs that this code is in, my A1:C1 rows are replaced but I want it to drop down a row every time the loop runs again. Does that make any sense? Let me know if you need anything additional and thank you.

Open the file in append mode?

wildplasser
– wildplasser

2012-06-13 14:33:48 +00:00
Commented Jun 13, 2012 at 14:33 — wildplasser
– wildplasser, Commented Jun 13, 2012 at 14:33

Carey Gregory · Accepted Answer · 2012-06-13 14:34:03Z

4

You need to open the file in append mode. Change the second parameter to fopen from "w" to "a".

answered Jun 13, 2012 at 14:34

Carey Gregory

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TZPike05 Over a year ago

Wow... haha. Very easy fix. Thank you.

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