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Doubt on using Array for 50000

dhanaraj shanmugam

Hi to all, The posting summery may be simple, but i am not able to fix the error.

Ok lets come to the problem. I am creating an Index
File "Test.txt" on Serial Flash using FILESystem which holds 50,000 datas each one is 2 bytes.

Another File is xx.txt which holds same 50,000 datas each size is 4 bytes. Using following function.

//MAX_USERS =50000

int File_Write_Index (unsigned int no_ofData)
{
        unsigned short count[MAX_USERS], i;
        FILE *fpt;

        fpt = fopen ("Test.txt","w");
    if (fpt == NULL)
    {
      printf ("File not found!. Write Failed\n");
          return 0;
    }

   else
   {
          for(i=0; i<MAX_USERS; i++)//MAX_USERS =50000
                count[i] = 0x0000 + i;

      fwrite (&count[0], 2, MAX_USERS, fpt);
          fclose (fpt);
          printf("\r\nWrite Succeed");
          return 1;
   }

}

and the second function for 4 bytes data same as first one where i change the size as 4.

fwrite (&count[0], 4, MAX_USERS, fpt);

Actually i made this function for 1000 MAX_USERS. But now i want to make it for 5000.

But Creating buffer for 50000 will increase the RAM size.
So i Created a line

unsigned long i=0;
unsigned char j;

for(k=0; k<MAX_USERS; )
{
j=(unsigned char *)&k;
fwrite (&j, 2, 1, fpt);
}

unsigned long j;

for(k=0x11111111; k<0x11111111+MAX_USERS; k++)
{
j=(unsigned char *)&k;
fwrite (&j, 2, 1, fpt);
}

But this one getting much time to read and write the files and even to search just for 1000 MAX_USERS.

   I am not able to go for more than 1000. The code does not print any errors. But its not working.

while debugging it goes to Somewhere which i dont know.

So i am here for your help and guidelines.
Please tell me how to create a line to move my 50000 no of 2 and 4 bytes of datas into my corresponding files? I am using LPC2388.

Parents
  • 0 in reply to dhanaraj shanmugam

    The result code means that you don't need to wait until you have run the full loop. After each and every call to fwrite() you will know if it has written the expected amount of data or not.

    When writing code, you should always consider checking the return values for functions that do return them - they return a value for a reason.

Reply
  • 0 in reply to dhanaraj shanmugam

    The result code means that you don't need to wait until you have run the full loop. After each and every call to fwrite() you will know if it has written the expected amount of data or not.

    When writing code, you should always consider checking the return values for functions that do return them - they return a value for a reason.

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