InFile Functionality Options and Attempt to Debug via Inputting a File

Question

Hi,
I am having 2 issues.
1. The first is that when I run this in debug mode, I have my .dat file I want to read in, however it is not being read in.  I set my 'Working Directory' in Debugging properities to be the Visual Studio\Projects folder and made sure the .dat file is
in the folder.  
2. The second is that I am using the read command, however want to save items within this .dat file to variables in a class.  Is there an example of that?  Will using the 'getline' command and then setting it to a variable work in this case or
is recommended?
Any help of any of these would be appreciated.  Thanks.
#include <iostream>
#include <fstream>
#include <complex>... std::vector<samp_type> buff(samps_per_buff);
std::ifstream infile(file.c_str(), std::ifstream::binary);...infile.read((char*)&buff.front(), buff.size()*sizeof(samp_type));

Answer 1

Hi,
I am having 2 issues.
1. The first is that when I run this in debug mode, I have my .dat file I want to read in, however it is not being read in.  I set my 'Working Directory' in Debugging properities to be the Visual Studio\Projects folder and made sure the .dat file
is in the folder.  
2. The second is that I am using the read command, however want to save items within this .dat file to variables in a class.  Is there an example of that?  Will using the 'getline' command and then setting it to a variable work in this
case or is recommended?
Any help of any of these would be appreciated.  Thanks.
#include <iostream>
#include <fstream>
#include <complex>
std::vector<samp_type> buff(samps_per_buff);
std::ifstream infile(file.c_str(), std::ifstream::binary);
infile.read((char*)&buff.front(), buff.size()*sizeof(samp_type));
1. You should always check if a file is opened successfully
std::vector<samp_type> buff(samps_per_buff);
std::ifstream infile(file.c_str(), std::ifstream::binary);
if (!infile.is_open())
// report error
2. As written, your code will not work because the vector buff is empty. The usual way to read an unknown number of records is something like
std::vector<samp_type> buff(samps_per_buff);
samp_type st;
while (infile.read((char*)&st, sizeof(samp_type))
buff.push_back(st);
If the file was written from a vector of samp_type, then the data will automatically be restored.
[In order for this to work, the class samp_type needs to be POD or standard_layout. This means in particular that it should not have virtual functions.]
David Wilkinson | Visual C++ MVP