CSV or Txt file merger

After long time I am posting this article due to some busy works. Recently my friend has encountered a problem which was about file merging. If we have two or 3 files then we can simply merge in to one . For example , Lets assume in your directory you have 3 files (all are having extension .csv or .txt) , Simplest way to do this, 

 C:\<your file directory> copy *.csv targetfilename.csv  ( pretty simple right  ?) 

If you have more than 100 or 1000 files you can use above command to append or merge . Now my friend's requirement was can we merge files by column. Because above command only append next file in to end of previous file. 

I have written a C++ program to achieve this very fast column wise merging. Enjoy it . 

#include <iostream>

#include <fstream>

#include <sstream>

#include <stdio.h>

#include <map>

#include <Windows.h>

using namespace std;

typedef map<int , char*> MAPFILES;

int main(int argc , char **argv)

{

cout <<"****************** CSV files merging program**************"<<endl;

cout <<"Written by vampire."<<endl;

cout<< "Date:20/3/2012"<<endl;

cout<<"Usage of this program..  program name  input.csv  output.csv "<<endl;

cout<<"***********************************************************"<<endl;

if(argc==1 || argc ==2)

{

cout <<"Wrong arg types. please contact vampire"<<endl;

}

else

{

ofstream myFile(argv[2], ios::out | ios::binary);

MAPFILES mapFile[40];

ifstream maininput;

int l_line=-1;

int l_realline =0;

int l_maxLine = 0;

maininput.open(argv[1]);

if(maininput.is_open())

{

while(maininput.good())

{

string line ;

char *zBuffer=new char[100];

memset(zBuffer,0, 100);

getline(maininput, line);

++l_realline;

int iFound =line.find_last_of("Timestamp");

if(iFound  != -1)

{

++l_line;

l_realline=0;

}

if(l_line ==-1)

cout <<"This is not a proper csv file. please contact to vampire"<<endl;

else

{

const  char *ptr = line.c_str();

int ip=0;

for(int i =0 ; i < line.size(); ++i)

{

if(i%2!=0)

{

zBuffer[ip] = ptr[i];

++ip;

}

}

mapFile[l_line].insert(make_pair<int,char *>(l_realline, zBuffer));

}

}

}

maininput.close();

cout <<"No of section found "<<l_line<<endl;

Sleep(10000);

/********************************************************************************/

int imin = 0;

for ( int i =0 ; i< l_line; ++i)

{

imin= mapFile[0].size();

if(imin > mapFile[l_line].size())

imin= mapFile[l_line].size();

}

map<int , char*>::iterator itr;

map<int , char*>::iterator itr1;

int iCount =0;

bool bfalse= false;

for(itr = mapFile[0].begin(); itr != mapFile[0].end(); ++itr)

{

if(iCount<imin)

{

char zBuff[1024];

memset(zBuff, 0, sizeof(zBuff));

char * ptr  =itr->second;

int iintiallength  =strlen(itr->second);

memcpy(zBuff,itr->second,iintiallength);

zBuff[iintiallength-1]=',';

zBuff[iintiallength]=0;

for(int j =1 ; j<=l_line; ++j)

{

itr1 = mapFile[j].find(iCount);

if(itr1 !=mapFile[j].end())

{

int iLen = strlen(mapFile[j].find(iCount)->second);

memcpy(zBuff+iintiallength,mapFile[j].find(iCount)->second,iLen);

iintiallength +=iLen;

zBuff[iintiallength-1]=',';

zBuff[iintiallength+iLen]=0;

bfalse =true;

}

else

{

bfalse = false;

}

}

if(bfalse)

myFile<<zBuff<<endl;

++iCount;

}

}

}

}