Hi all,
I'm sure it's an error by me, but I'm having a problem with ifstream inside a loop. The reason for the loop is read in a piece of text from multiple files, and cases within the switch statement change the filename, path is previously declared.
The first iteration of the for loop always works and the value "chamberarrayval" is output, but the subsequent values from the subsequent files never materialise. The switch statement is OK as I've tried the cases in isolation without the loop. Do I need to define ifstream everytime or something else? Any help much appreciated.
double openfunc(void){
// loop through files
for(int j=1;j<5;j++){
// switch statement to changed filename
switch(j){
case 1: fileName = path.append("file1");
break;
case 2: fileName = path.append("file2");
break;
case 3: fileName = path.append("file3");
break;
case 4: fileName = path.append("file4");
break;
}
// open selected file
ifstream infile(fileName.toStdString().c_str());
//define vector and string
vector<string> lines;
string line;
// read file into vector line by line
while (getline(infile, line)){
lines.push_back(line);
}
infile.close();
// loop through vector line by line
for (int i = 0; i < lines.size(); i++){
str = lines[i];
// information required is on line 744
if (i==744){
centralchamber = str.substr(9,10);
chamberarrayval = atof(centralchamber.c_str());
cout << chamberarrayval << endl;
}
}
}
}
