Tag: c++

Accessing data of leptonica PIX data

This is mainly as a reference


/**
 * Get Pixel value at given  point
 */
l_uint32 pixAtGet(PIX* pix, int_t x, int_t y)
{
    l_int32 wpl    = pixGetWpl(pix);
    l_uint32* data = pixGetData(pix);
    l_uint32* line = data + y * wpl;
    l_uint32 value = GET_DATA_BYTE(line, x);
    return value;
}

To set a pixel value we can use this

/**
 * Set Pixel value at given  point
 */
void pixAtSet(PIX* pix, int_t x, int_t y, byte_t value)
{
	l_int32 wpl     = pixGetWpl(pix);
	l_uint32* data  = pixGetData(pix);
	l_uint32* line  = data + y * wpl;
	SET_DATA_BYTE(line, x, value);
}

March 11, 2015

Tokenizing/splitting string in c++

This method uses strtok to tokeninze our string given a specific delimeter, results of that are put into supplied vector. There are few other ways we can do this but this one is straight forward.

#include 
#include 
#include 

#include 
#include 
#include 
#include 
#include 

using namespace std;

void split(vector& out, const string& in, const string& delim)
{
  char* lc = (char*) malloc(in.size());
  strcpy(lc, in.c_str());
  strtok(lc, delim.c_str());
  while (lc)
    {
      string s = lc;
      out.push_back(s);
      lc = strtok(NULL, delim.c_str());
    }
  free(lc);
}

int main(int argc, char* args[])
{
  string str = "apple,organge,cherry";
  vector o1;
  split(o1, str, ",");

  for (int i = 0; i < o1.size(); ++i)
  {
     cout << "token = " << o1[i] <
Results
Supplied string : apple,organge,cherry

Delemeter : ","

Output

apple
organge
cherry

March 10, 2015