File stream seekg() does seem to be working.

vincegata (112)
Hello,

I use g++ on Ubuntu.

I open config file somewhere, then when I call GetInteger() function for the first time it works fine, when I call it second time it does not work. The problem is the get pointer is at the end of the file when I call GetInteger() for the second time (I know that from the len value).

Could someone help me with this? TIA!

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
 

ReadConfigClass::ReadConfigClass(string str)
{
    file_name = str;
    file_stream.open(file_name.c_str(), ios_base::in | ios_base::out | ios_base::app);
    if (!file_stream.is_open())
        err("error opening config file.");
}

int ReadConfigClass::GetInteger(string key)
{
    string line;
    int value = -1;
    string value_str;
    file_stream.seekg(0, ios::beg);
    file_stream.clear();
    int len = file_stream.tellg();
    while ( getline(file_stream, line) )
    {
        if( line.substr(0,11) == key)
        {
            value_str = line.substr(12);
            //value_str = ltrim(rtrim(value_str));
            value = strtoi(value_str);
        }
    }
    return value;
}

Peter87 (11254)
seekg will not work if any error flags are set so switch order on line 15 and 16.
vincegata (112)
ah, I have to clear() first. thank you!
Topic archived. No new replies allowed.