Compiler or OS bug??

I need some urgent help here. This is the (isolated) problem. When I drag a file(s) onto the program's icon to run this program, fread() reads incorrect values into the variables! Otherwise, it runs fine.
The compiler is DevC++, running on Windows 98. If anyone can compile and run this program to duplicate these results, I would sincerely appreciate it.
I would be interested to see if other compilers produce the same results as well....I need to know if this is a compiler or OS bug!!!

Code:

#include <iostream>
#include <stdio.h>

int main(int argc, char *argv[])
{
 const char file[] = "x.dat";

 int a = 123;
 int b = 456;

 cout << "a: " << a << endl;
 cout << "b: " << b << endl << endl;

 FILE * fp = fopen(file, "rb");

   if(fp)
  {
   fread(&a, sizeof(int), 1, fp);
   fread(&b, sizeof(int), 1, fp);
   fclose(fp);
  }
   else
  {
      fp = fopen(file, "wb");

         if(fp)
        {
         fwrite(&a, sizeof(int), 1, fp);
         fwrite(&b, sizeof(int), 1, fp);
         fclose(fp);
        }

  }

 cout << "a: " << a << endl;
 cout << "b: " << b << endl;

 cin.get();

 return 0;
}

>>fread() reads incorrect values into the variables
How do you know it read any? You aren't checking its return code.

Can you explain the problem a bit more please.

Your code does work, with one slight change.

cout by itself means nothing. You'd have to either use std::cout for each time you use it, or adding using namespace std after your #includes.

EDIT : Forgot the 'or'. Slap me.

Let me explain a little better. I have a program that proccesses files that are dragged and dropped to it (unless argc == 1, in which case, the user can change certain settings). Suddenly, I realized that the program's configuration flags were set incorrectly, but this only happened when argc>1! Note that the program's code up to that point is the same for either mode. And yes, I was checking the return value of fread - it was succeeding! There you have it. Somehow the Windows Drag and Drop feature is causing the weird bug to occur. Needless to say, I'd better get a hold of another compiler(or OS!)!

I don't understand how your program can be accepting files since you are not doing anything with the argc argv arguments passed to the main function. For drag and drop to work you usually have to read in these arguments so that it can determine the file name and open it.

Mr. Salem. You are a genius!!! I really appreciate your help. Thank you, thank you, thank you. I really owe you one. Or several. Again, thanks so much. I will be more observant in the future!

- Neil

Thanks again, Salem. I inserted this into the code and now it runs fine:

Code:

char * PrependPath(char * filename, const char * argv0)
{
 char temp[strlen(filename)+1];

 strcpy(temp, filename);

 strcpy(filename, argv0);

 char * next = filename, * end = filename;

 do{

    next = strstr(next, "\\");

    if(next)end = ++next;

    }while(next);

 *end = 0;

 strcat(filename, temp);

 return filename;
}






#include <iostream>
#include <stdio.h>

int main(int argc, char *argv[])
{
 char file[10240] = "x.dat";

 PrependPath(file, *argv);

 int a = 123;
 int b = 456;

 cout << "a: " << a << endl;
 cout << "b: " << b << endl << endl;

 FILE * fp = fopen(file, "rb");

   if(fp)
  {
   fread(&a, sizeof(int), 1, fp);
   fread(&b, sizeof(int), 1, fp);
   fclose(fp);
  }
   else
  {
      fp = fopen(file, "wb");

         if(fp)
        {
         fwrite(&a, sizeof(int), 1, fp);
         fwrite(&b, sizeof(int), 1, fp);
         fclose(fp);
        }

  }

 cout << "a: " << a << endl;
 cout << "b: " << b << endl;

 cin.get();

 return 0;
}

I appreciate your help!!