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Old May 22nd, 2004, 11:01 PM
aerea aerea is offline
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Input int from file.

I'm having some problems inputting an int from a file into another program. I can get it in successfully, but the contents make no sense. Here is my code:


Code:
    std::fstream f_In;
    
    int iMTData;
    int iMTModifier;

    f_In.open("file", std::ios::in | std::ios::binary);

    f_In.read((char*)&iMTData, sizeof(int));
    f_In.read((char*)&iMTModifier, sizeof(int));

    std::cout << "MTData: " << iMTData << std::endl;
    std::cout << "MTModifier: " << iMTModifier << std::endl;

    f_In.close();


MTData returns 1
MTModifier returns 1

"file" is 8 bytes long (2 words) of (in decimal representation): 01 00 00 00 00 00 00 00

Can anybody explain this?

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Old May 23rd, 2004, 11:41 PM
conejito conejito is offline
cien por ciento conejo.
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this works for me, are you sure the data in your file are ok?

Code:
#include <iostream>
#include <fstream>

int main()
{   
  
  std::fstream f_Out;
  f_Out.open("file", std::ios::out | std::ios::binary );
  
  int i1=10;
  int i2=20;

  f_Out.write(reinterpret_cast<char *>(&i1), sizeof(int));
  f_Out.write(reinterpret_cast<char *>(&i2), sizeof(int));
  
  f_Out.close();

  std::fstream f_In;
    
  int iMTData;
  int iMTModifier;
  
  f_In.open("file", std::ios::in | std::ios::binary);
  
  f_In.read((char*)&iMTData, sizeof(int));
  f_In.read((char*)&iMTModifier, sizeof(int));
  
  std::cout << "MTData: " << iMTData << std::endl;
  std::cout << "MTModifier: " << iMTModifier << std::endl;
  
  f_In.close();
  
  return 0;
}


output:
PHP Code:
[matt@conejito crap]$ g++ file_input.cc
[matt@conejito crap]$ ./a.out
MTData
10
MTModifier
20
[matt@conejito crap]$ 



i'm using rh9, gcc 3.2.

cheers,
conejito

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