Simple txt file import and string to int coversion

beginners
#1

Is there a simple way to import txt files or urls?

I think i got that part using fopen, but i was hoping for a simpler way in OF.http://www.cs.bu.edu/teaching/c/file-io/intro/

Once i have imported strings, how do i convert them to ints or floats?

A simple example would be very helpful. Sorry if this is obvious. It seems like a very basic thing that i should be able to do, but i couldn’t find anything in the OF documentation.

#2

There is a handy C++ way to write and load text files. With the stream operator type conversion is pretty much seamless :wink:

This is some code I have lying around …

  
  
void Calibrator::saveSettings() {  
    ofstream fout;  
    fout.open( ofToDataPath("calibration.txt").c_str() );  
              
    fout << translation.x << " " << translation.y << endl  
         << rotAngle << endl  
         << scale.x << " " << scale.y << endl  
         << A.x << " " << A.y << endl  
         << B.x << " " << B.y << endl  
         << C.x << " " << C.y << endl  
         << D.x << " " << D.y << endl  
         << camIntrinsics[0] << " " << camIntrinsics[4] << endl  
         << camIntrinsics[2] << " " << camIntrinsics[5] << endl  
         << distortionCoeffs[0] << " " << distortionCoeffs[1] << endl  
         << distortionCoeffs[2] << " " << distortionCoeffs[3] << endl;  
      
    fout.close();  
}  
  
  
  
void Calibrator::loadSettings() {  
    ifstream fin;  
    fin.open( ofToDataPath("calibration.txt").c_str() );  
  
    fin >> translation.x >> translation.y  
      >> rotAngle  
      >> scale.x >> scale.y  
      >> A.x >> A.y  
      >> B.x >> B.y  
      >> C.x >> C.y  
      >> D.x >> D.y  
      >> camIntrinsics[0] >> camIntrinsics[4]  
      >> camIntrinsics[2] >> camIntrinsics[5]  
      >> distortionCoeffs[0] >> distortionCoeffs[1]  
      >> distortionCoeffs[2] >> distortionCoeffs[3];  
        
    fin.close();  
}

My file typically looks like this:

  
  
12.5 4.5  
0  
0.97 0.97  
0 0  
320 0  
320 240  
0 240  
5400 5100  
170 154  
-103 -334  
-0.3 -1.63913e-08

Hope that helps,