fstream - C++ ifstream getline not working -


i'm trying read values config file in c++ , getline doesn't seem working.

the relevant portion of code looks this:

#include <iostream> #include <fstream> #include <unistd.h> using namespace std; // ... ifstream config( configpath );   string line;    message( diagverbose, "config: %s\n", configpath.c_str());   bool exists = ( access( configpath.c_str(), f_ok && r_ok ) != -1 );   message( diagverbose, "exists?: %s\n", exists ? "true" : "false");    // causing fail bit set    //config.open( configpath );   if (config.is_open())   {     message( diagverbose, "config open%s\n", config.good() ? "good" : "bad" );     while ( getline( config, line ) )     {       message( diagverbose, "line: %s", line.c_str());       extension_t extension = parseconfig( line );       extensions[ extension.name ] = extension.type;     }     config.close();   } else {     fatalerror( "could not open file %s\n", configpath.c_str());   }

the message function wrapper printf , prints following:

config: ./tool.conf exists?: true config open: 74181 segmentation fault: 11

but in while loop skipped. file i'm reading have data in it.

why getline not getting line though file exists , readable?

update

i changed code above reflect changes suggested @rici however, i'm facing segmentation fault @ same line before in while loop called.

you're opening config twice (once in constructor, , again using explicit open). second open error, causes failbit set (even though ifstream still open.) on, i/o operations ifstream fail.


Comments

Post a Comment

Popular posts from this blog

c++ - Difference between pre and post decrement in recursive function argument -

i have following sample code used pre-decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(--c); cout << c << endl; return; } } this function give output input 4 : dp3 dp2 dp1 dp0 0 1 2 3 but when use post decrement void function(int c) { if(c == 0) { return; } else { cout << "dp" << c << endl; function(c--); cout << c << endl; return; } } output goes in infinite loop dp4 can explain me in detail why happens ? this happens because function(c--) called same value of c , when finishes c decremented. recursively called, hence called same value no chance of return , hit stack overflow error. assume this, int x = 1, y = 0; y = x++ result y == 1 , x == 2. if y = ++x , bot x , y 2.
Read more

php - Nothing but 'run(); ' when browsing to my local project, how do I fix this? -

i added new project. made mistake in projectname.conf file in sites-available apache2, led me reinstalling apache2. after reinstalling , re-enabling projects on every page of every project .. <body> run(); </body> .. i've run composer update, restarted service, restarted pc, checked config files, tried disabling new project. there nothing in error log, , access.log: 127.0.0.1 - - [15/may/2015:01:40:47 +0200] "get / http/1.1" 304 181 "-" "mozilla/5.0 (x11; ubuntu; linux x86_64; rv:38.0) gecko/20100101 firefox/38.0" maybe i'm forgetting apache2 reinstall? don't think did different last time installed it. looks haven't setup php correctly. take @ this great guide , maybe you're forgetting link php config apache2.
Read more

php - How can I echo out this array? -

i don't know how go grabbing data in variable , put foreach loop. class tree{ private $info = array( array('name'=>'jim','state'=>'nu','company'=>'nu','phone'=>array('cell'=>'5615111111','office'=>'5611111111'),'email'=>array('primary'=>'exs@example.com','ex@there.com')), array('name'=>'joe smith','city'=>'phoenix','phone'=>'4805551111','email'=>'jsmith@some_email.com'), array('name'=>'john doe','city'=>'chandler','company'=>'doe co.','email'=>array('jdoe@gmail.com','personal'=>'email@email.com'),'phone'=>'6025550002') ); } if you're inside of class, can access private variable using $this->variablename . example, i...
Read more