going back to beginning of file

Hi everyone,

I am reading a binary file completely, but I would like to restart reading the file, by moving to the beginning of the file again. I have tried using file.seekg(0, ios::beg); but it doesn't seem to work.

In a readfile function I read the file once, and it works.

Code:

    vector<uint32_t> buf(numcols);

    if(file.is_open())
    {
        while (file.read(reinterpret_cast<char*>(&buf[0]), sizeof(uint32_t)*numcols))
        {
            for(size_t i = 0; i < numcols; ++i)
            {
                freq[i][buf[i]]++;
            }
        }
    } 

    file.seekg(0, ios::beg);    // This supposedly brings the pointer to the beginning  of the file again.

in another function I try:

Code:

 while (file.read(reinterpret_cast<char*>(&buf[0]), sizeof(uint32_t)*numcols))
        {
            for(size_t i = 0; i < numcols; ++i)
            {
                freq[i][buf[i]]++;
            }
        }

but strange numbers indicate that it isn't actually reading the file from the beginning.

Ted.

You also need file.clear() to reset the EOF state, if you ran into the end of file.

Thanks that worked.

Ted.