c++ - SDL Text Input returning white squares -

i created event class , wanted text it. unfortunately text isn't reading correctly...

i've set text gotten output command line when new key input, isn't working.

here's "eventmanager" code update function:

void eventmanager::update(){     while(sdl_pollevent(&e)){          switch(e.type){             case sdl_quit:                 running = false;                 break;             case sdl_mousebuttondown:                 mousepressed = true;                 break;             case sdl_keydown:                 if(shouldcollecttext && e.key.keysym.sym == sdlk_backspace && currentcollectedtext.length() > 0){                     currentcollectedtext.pop_back();                 }else if(shouldcollecttext && e.key.keysym.sym != sdlk_backspace){                     currentcollectedtext += e.text.text; //the problem                     std::cout << currentcollectedtext << std::endl;                 }         }     } } 

i followed the lazy foo tutorials, , can't find problem.

some other things note:

i start text input in "main.cpp" class:

int main( int argc, char *argv[] ) {     game *game = new game();     game->init();      sdl_starttextinput();      while(game->isrunning()){         game->handleevents();         game->update();         game->render();     }      game->close();     sdl_stoptextinput();     return 0; } 

i create of variables in "eventmanager.h":

bool shouldcollecttext; std::string currentcollectedtext; 

and define them in "init()" function:

shouldcollecttext = false; currentcollectedtext = ""; 

your problem using wrong event type. take second @ lazy foo's tutorial , here:

textinputevent

e.text.text reserved text input events , nothing else. being sdl_event union of structures, overlaps may occur in used memory. see in terminal output.

remove sdl_keydown event , try instead:

case sdl_textinput:      currentcollectedtext += e.text.text;      break; 

i'm not sure std::cout << currentcollectedtext << std::endl; though. depends on when want output of text content.

if want use sdl_keydown have access keysym tables , maybe calculate letter correspond , print out. say, approach more complicated want achieve.

so in conclusion e.text.text work if e.type has sdl_textinput value event. other settings in code event should triggered , may text type in.

so complete example this:

void eventmanager::update(){     while(sdl_pollevent(&e)){          switch(e.type){             case sdl_quit:                 running = false;                 break;             case sdl_mousebuttondown:                 mousepressed = true;                 break;             case sdl_textinput:                 if(shouldcollecttext && currentcollectedtext.length() > 0){                     currentcollectedtext.pop_back();                 }else if(shouldcollecttext) {                     currentcollectedtext += e.text.text; //the problem                     std::cout << currentcollectedtext << std::endl;                 }                 break;            default: break;         }     } }