C / C++ / MFC

manoharbalu wrote:

Please note that I am going to write the structure to the file for 4 days as a maximum period.

Joe Woodbury wrote:

If the data needs to be future proofed, consider serializing using RapidJSON (which is a very fast C++ JSON library), compressing the result with LZ4 and then writing that

Quote:

1. How to save the structure (900 KB) to the file in reduced size format, such that the file size doesn't become too big?
2. Saving the structure every second data as an individual file for reading and writing (there will be 60 files for 60 seconds)
or saving the structure sequentially in the same file(only one file)...Which is efficient for reading and writing

Please note that I am going to write the structure to the file for 4 days as a maximum period.

charlieg wrote:

This all boils down to requirements, and nothing has been offered by the OP except for "I need to write it fast." There is nothing to do with hardware here - it might be another requirement.

Joe Woodbury wrote:

If the data needs to be future proofed, consider serializing using RapidJSON (which is a very fast C++ JSON library), compressing the result with LZ4 and then writing that.

Quote:

But when I checked the #define value of the INFINITE, it is 0xFFFF.

Quote:

So it just depends on how much you trust the documentation.
Quote Selected Text

PrafullaVedante wrote:

considering the user will never keep itself block for 49 days ....

#include <iostream>
using namespace std;


void transp_v1( char tgt[3][3], char src[3][3] );
void transp_v2( char tgt[3][3], char src[3][3] );
void dump( char m[3][3] );


int main()
{
  char a[3][3] =
  {
    { 'a', 'b', 'c' },
    { 'd', 'e', 'f' },
    { 'g', 'h', 'i' },
  };

  char b[3][3];
  char c[3][3];

  transp_v1( b, a);
  transp_v2( c, a);


  dump(a);
  cout << "--------\n";
  dump(b);
  cout << "--------\n";
  dump(c);
  cout << "--------\n";
}
void transp_v1( char tgt[3][3], char src[3][3] )
{
  for (int i=0; i<3; ++i)
    for (int j=0; j<3; ++j)
      tgt[i][j] = src[j][i];
}

void transp_v2( char tgt[3][3], char src[3][3] )
{
  for (int i=0; i<3; ++i)
    for (int j=0; j<3; ++j)
      tgt[j][i] = src[i][j];
}

void dump( char m[3][3] )
{
  for (int i=0; i<3; ++i)
  {
    for (int j=0; j<3; ++j)
      cout << m[i][j] << " ";
    cout << "\n";
  }
}

a b c 
d e f 
g h i 
--------
a d g 
b e h 
c f i 
--------
a d g 
b e h 
c f i 
--------

#include <stdio.h>
  

int main()
{
  int a[3][3],b[3][3],i,j;
  for(i=0;i<3;i++)
    for(j=0;j<3;j++)
      scanf("%d",&a[i][j]);

  for(i=0;i<3;i++)
  {
    for(j=0;j<3;j++)
    {
      printf("%d ",a[i][j]);
    }
    printf("\n");
  }
  for(i=0;i<3;i++)
  {
    for(j=0;j<3;j++)
    {
      b[j][i]=a[i][j];
    }
    printf("\n");
  }
  for(i=0;i<3;i++)
  {
    for(j=0;j<3;j++)
    {
      printf("%d ",b[i][j]);
    }
    printf("\n");
  }
  return 0;
}

b[j][i]=a[i][j];
printf("%d ",b[i][j]);