File reading problem.. Please help.

_Zido_ · 2005-08-16T02:27:54

Ok, I'm making a test-based rpg game, and right now i made a little program to test if my item reading "system" works. What it does is reads from a file, "itemsdb.txt", the item information, and then displays the data for each item loaded. The items data is seperated by commas, for example: data1,data2,data3..ect... The program compiles with no problems, although when i run the program it says: "testitems.exe has encoundered a problem and needs to close". This is my sourcecode: #include <stdio.h> #include <stdlib.h> typedef struct { int id; char name[75]; char type[25]; int cost; int str; int def; }items_db; items_db items[50]; int main() { FILE* itdb; char tempdb[255]; int row; itdb = fopen("itemdb.txt","r"); while(fgets(tempdb,255,itdb)!=NULL) { sscanf(tempdb,"%d , %s , %s , %d , %d , %d",items[row].id,items[row].name,items[row].type,items[row].cost,items[row].str,items[row].def); row++; printf("==============================\n"); printf("| ITEM ID %d |\n",items[row].id); printf("==============================\n"); printf("Item name = %s...loaded.\n",items[row].name); printf("Item type = %s...loaded.\n",items[row].type); printf("Item cost = %d...loaded.\n",items[row].cost); printf("Item str = %d...loaded.\n",items[row].str); printf("Item def = %d...loaded.\n",items[row].def); printf("Item id %d successfully finished loading.\n",items[row].id); } fclose(itdb); system("pause"); return 0; } //end of file The itemdb.txt contains: 1,Short Sword,wep,100,15,0 2,Long Sword,wep,500,30,0 3,Great Sword,wep,1000,50,0 Thanks for any help

For Beginners

Started by _Zido_ August 16, 2005 12:42 AM

10 comments, last by GameDev.net 18 years, 8 months ago

vNistelrooy

140

August 16, 2005 02:16 AM

Quote:Original post by _Zido_
Okay, i found the problem, and its alot simpler than all the other solutions.

The problem is here:

int row;

I changed it to:

int row=0;

And poof, it works.
The problem was when i set the variable it probably gets set to NULL. You cant have an array which is NULL. And therefore the program crashed =]
Thanks for everyones help anyways.

If you use uninitialized variables, their value is unprediceable, and not always NULL. Besides NULL==0 unless you #define NULL something_else.

"C lets you shoot yourself in the foot rather easily. C++ allows you to reuse the bullet!"

Anonymous

August 16, 2005 02:27 AM

The answer to this sort of problem is to set your warning level to maximum and don't ignore warnings. Ideally, force your compiler to treat warnings as errors.

Uninitialised variables are easily picked up by the compiler and it can save hours of debugging time.

File reading problem.. Please help.

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File reading problem.. Please help.

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