I am trying to read mesh data from a fluent mesh file. The code works perfectly till it reads node data. While reading cell data, it exits randomly by giving random negative number or what() std::bad_alloc. I am not able to understand the reason behind this behaviour. Please help me to resolve the issue. I tried printing different variables, but it works perfectly just before it exits. Here is what I have been able to put together till now
#include <sstream>
#include <iostream>
#include <fstream>
#include <vector>
int str_to_int( std::string s);
double str_to_double( std::string s);
int strhex_to_int(std::string s);
std::vector<std::string> convert_string_to_vector(std::string line);
void GetDimension();
void GetNodes();
void GetCells();
void GetFaces();
void GetBcNames();
std::ifstream meshFile ;
std::string fileLine;
std::vector<std::string> lineVector;
int nDim, nNodes, nCells, nFaces;
double *nodePoints;
int *cellData, *faceData;
int main()
{
int property;
meshFile.open("test.msh", std::ifstream::in);
if (meshFile.is_open())
{
while ( !meshFile.eof() )
{
std::getline(meshFile,fileLine);
//std::cout << fileLine << "\n";
lineVector = convert_string_to_vector(fileLine);
if(lineVector.empty())
continue;
else
property = str_to_int( lineVector[0] );
//std::cout << property << "\n";
/*
for(int j=0; j < lineVector.size(); j++)
{
std::cout << lineVector[j] << "\n";
}
*/
switch(property)
{
case 0:
std::cout << "Comment Detected\n";
lineVector.clear();
break;
case 2:
GetDimension();
break;
case 10:
GetNodes();
break;
case 12:
GetCells();
break;
case 13:
GetFaces();
case 39:
GetBcNames();
default:
std::cout << "Problem with mesh file\n";
}
}
}
else std::cout << "Unable to open file";
}
void GetDimension()
{
nDim = str_to_int(lineVector[1]);
std::cout << "Problem Dimension: " << nDim << "\n";
lineVector.clear();
}
void GetNodes()
{
int nodeZoneId, startNode, endNode, nodeType;
std::string fileLine;
nodeZoneId = str_to_int(lineVector[1]);
if (nodeZoneId == 0)
{
nNodes = strhex_to_int( lineVector[3]);
std::cout << "Total Nodes = " << nNodes << "\n";
lineVector.clear();
if (nDim == 2)
nodePoints = new double[nNodes*2];
else
nodePoints = new double[nNodes*3];
}
else
{
startNode = strhex_to_int( lineVector[2]);
endNode = strhex_to_int( lineVector[3]);
nodeType = str_to_int(lineVector[4]);
std::cout << "Reading nodes from "<< startNode << " to " << endNode << " of type " << nodeType << " for zone = " << nodeZoneId << "\n";
lineVector.clear();
for( int j = startNode - 1; j < endNode; j++)
{
//std::cout << j << "\n";
std::getline(meshFile,fileLine);
if (fileLine.empty())
{
std::cout << "No Nodes found in file!" << "\n";
break;
}
//std::cout << fileLine << "\n";
lineVector = convert_string_to_vector(fileLine);
if(lineVector.empty())
j--;
else
{
if(nDim == 2)
{
//std::cout << lineVector[0] << "\t" << lineVector[1] << "\n";
nodePoints[0*nNodes + j] = str_to_double(lineVector[0]);
nodePoints[1*nNodes + j] = str_to_double(lineVector[1]);
std::cout << nodePoints[0*nNodes + j] << " " << nodePoints[1*nNodes + j] << "\n";
lineVector.clear();
}
else
{
//std::cout << lineVector[0] << "\t" << lineVector[1] << "\t" << lineVector[2] << "\n";
nodePoints[0*nNodes + j] = str_to_double(lineVector[0]);
nodePoints[1*nNodes + j] = str_to_double(lineVector[1]);
nodePoints[2*nNodes + j] = str_to_double(lineVector[2]);
std::cout << nodePoints[0*nNodes + j] << " " << nodePoints[1*nNodes + j] << " " << nodePoints[2*nNodes + j] << "\n";
lineVector.clear();
}
}
}
}
//std::getline(meshFile,fileLine);
//std::cout << fileLine << "\n";
//std::getline(meshFile,fileLine);
//std::cout << fileLine << "\n";
//lineVector.clear();
}
void GetCells()
{
int cellZoneId, startCell, endCell, cellType;
std::string fileLine;
cellZoneId = str_to_int(lineVector[1]);
//std::cout << cellZoneId << "\n";
if (cellZoneId == 0)
{
nCells = strhex_to_int(lineVector[3]);
//std::cout << "Total Cells = " << nCells << "\n";
lineVector.clear();
cellData = new int(nCells*2);
}
else
{
startCell = strhex_to_int(lineVector[2]);
endCell = strhex_to_int(lineVector[3]);
cellType = str_to_int(lineVector[5]);
std::cout << "Reading cells from "<< startCell << " to " << endCell << " of type " << cellType << " for zone = " << cellZoneId << "\n";
lineVector.clear();
if(cellType != 0)
{
for(int j = startCell - 1; j < endCell; j++)
{
cellData[0*nCells + j] = cellZoneId;
cellData[1*nCells + j] = cellType;
}
}
else
{
for(int j = startCell - 1; j < endCell; j++)
{
std::getline(meshFile,fileLine);
//std::cout << fileLine << "\n";
if (fileLine.empty())
{
//std::cout << "No Cells found in file!" << "\n";
break;
}
lineVector = convert_string_to_vector(fileLine);
if(lineVector.empty())
j--;
else
{
int k = 0;
//std::cout << lineVector.size() << "\t" << k << "\n";
while(k < lineVector.size())
{
cellData[0*nCells + j] = cellZoneId;
//std::cout << j << "\t" << lineVector[k] << "\n";
cellData[1*nCells + j] = str_to_int(lineVector[k]);
k++;
std::cout << nCells*2 << "\t" << 0*nCells + j << "\t" << 1*nCells + j << "\n";
j++;
}
lineVector.clear();
j--;
}
}
}
}
}
void GetFaces()
{
nDim = str_to_int(lineVector[1]);
lineVector.clear();
}
void GetBcNames()
{
nDim = str_to_int(lineVector[1]);
lineVector.clear();
}
std::vector<std::string> convert_string_to_vector(std::string line)
{
std::stringstream ss;
std::vector<std::string> stringVector;
stringVector.clear();
ss << line;
std::getline(ss, line);
ss.clear();
std::size_t prev = 0, pos;
//std::cout << line << "\n";
while ((pos = line.find_first_of(" ()", prev)) != std::string::npos)
{
//std::cout << prev << "\t" << pos << "\n";
if (pos > prev)
{
//std::cout << line.substr(prev,pos-prev) << "\t";
stringVector.push_back(line.substr(prev, pos-prev));
}
prev = pos+1;
}
//std::cout << "\n";
if (prev < line.length())
stringVector.push_back(line.substr(prev, std::string::npos));
/*
for(int j=0; j < stringVector.size(); j++)
{
std::cout << stringVector[j] << "\t";
}
std::cout << "\n";
*/
return stringVector;
}
int str_to_int(std::string s)
{
//std::cout << s << "\t";
std::istringstream temps(s);
int temp;
temps >> temp;
//std::cout << temp << "\n";
return temp;
}
double str_to_double(std::string s)
{
//std::cout << s << "\n";
std::istringstream temps(s);
double temp;
temps >> temp;
//std::cout << temp << "\n";
return temp;
}
int strhex_to_int(std::string s)
{
//std::cout << s << "\n";
std::stringstream temps;
temps << std::hex << s;
int temp;
temps >> temp;
//std::cout << temp << "\n";
return temp;
}
Also please indicate if there is a better way to do the same job with C++
The input file is huge so its uploaded here
https://drive.google.com/file/d/0Bz_4p6XclzrncU5BZG5MZUtNUmM/view?usp=sharing
