c++ - Creating successfully console window but cout doesn't print anything on it ( visual studio enterprise 2015 ) -

i've created dynamic dll. interesting thing same code i'll build in visual studio 2010 works fine while building code on visual studio 2015, doesn't work.

#include <windows.h> #include <stdio.h> #include <fcntl.h> #include <io.h> #include <iostream> #include <fstream> #include <string> #include <vector>  #define exp __declspec(dllexport)  __stdcall using namespace std;  void spgoconsole(int status); void exp ttest(int in) {     spgoconsole(1);     cout << "hello world!" << endl; }  void spgoconsole(int status) {     if (status == 0)     {         freeconsole();         return;     }     int hconhandle;     long lstdhandle;     console_screen_buffer_info coninfo;     file *fp;     allocconsole();     getconsolescreenbufferinfo(getstdhandle(std_output_handle), &coninfo);     coninfo.dwsize.y = 1000;     coninfo.dwsize.x = 1000;     setconsolescreenbuffersize(getstdhandle(std_output_handle), coninfo.dwsize);     lstdhandle = (long)getstdhandle(std_output_handle);     hconhandle = _open_osfhandle(lstdhandle, _o_text);     fp = _fdopen(hconhandle, "w");     *stdout = *fp;     cout = fp;     setvbuf(stdout, null, _ionbf, 0);     lstdhandle = (long)getstdhandle(std_input_handle);     hconhandle = _open_osfhandle(lstdhandle, _o_text);     fp = _fdopen(hconhandle, "r");     *stdin = *fp;     setvbuf(stdin, null, _ionbf, 0);     lstdhandle = (long)getstdhandle(std_error_handle);     hconhandle = _open_osfhandle(lstdhandle, _o_text);     fp = _fdopen(hconhandle, "w");     *stde      rr = *fp;     setvbuf(stderr, null, _ionbf, 0);     ios::sync_with_stdio(); } 

i not using special settings in visual studio 2015. default.

if use:

allocconsole(); 

then first time program imports dll , calls ttest, doesn't print out second time calls ttest prints out hello world!.

then tried calling allocconsole 2x still didn't print until program called ttest again.

edit: appearst after second dll import while program running, starts print.

anyideas? thanks