Reading Specific Data in Files

[NewHydrolisk]

Hello there. I am trying to create save and load functions that will write data to a file and read data from a file respectively. I am using Dev-C++, so my compiler would be MinGW. I think.

Specifically, the problem I have at hand is the data reading from the file. I have solved the saving portion of my task.

code:

void save() // game save {     ofstream charFile( "charFile.sav", ios::trunc | ios::binary ); // open output file stream for "charFile"     if( charFile.is_open() == 1 )     {         charFile << "    destiny" << endl; // line 1         charFile << destiny << endl; // line 2         charFile << "    level" << endl; // l 3         charFile << LVL << endl; // l 4         charFile << "    experience" << endl; // l5         charFile << EXP << endl; // l 6         charFile << "    hitpoints" << endl; // l 7         charFile << HP << endl; // l 8         charFile << "    attack" << endl; // l 9         charFile << ATK << endl; // l 10         charFile << "    defence" << endl; // l 11         charFile << DEF << endl; // l 12          // l 13         charFile.close();     }     else     {         error( "Could not save game." );     } } void load() // game load {     ifstream charFile( "charFile.sav", ios::binary ); // open input fstream for "charFile"     if( charFile.is_open() == 1 )     {             }     else     {         error( "Could not load game. Previous game may not have been saved." );     } }

As you can see, the written binary file would have a total of 13 lines, with every line stating a comment or the comment's value. The saving portion works fine.

However, I am entirely at a loss as to how I would approach "loading" the same file into the program.

I know that I only need to load every even-numbered line from 2 to 12 and assign the appropriate variables the read values, but I simply do not know how to go about doing so.

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If I do anything/say anything stupid, I'll try to fix it if you tell me. I've very little practical C++ experience, I'm still learning C++, and I'm more or less new to the forum.

[Tony]

You are opening the files for binary input/output, but your code suggests that you actually want to be in the text mode (there are no "2nd line" in binary mode, there's only "42 bytes in, here's a stream of bits").

http://www.cplusplus.com/doc/tutorial/files/

[NewHydrolisk]

oops okay I got/changed it now.

c++:

void load() // game load {     ifstream charFile( "charFile.sav" ); // open input fstream for "charFile"     if( charFile.is_open() == 1 )     {         string line;         for( int i = 0; i != 13; i++ )         {             getline( charFile, line );             if( i % 2 == 1 )             {                 cout << line << endl;             }         }         charFile.close();     }     else     {         error( "Could not load game. Previous game may not have been saved." );     } }

Here's what I have now. It works perfectly as intended. However, I'm just curious if there is a more efficient way of reading the file, since the program would read the unnecessary header lines too.

I don't think I can use seekg() because the odd lines carry values that might vary in number of digits.