Thread: 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;
}

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!)!

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!!