c++ - Why cvPutText doesn't work in this case? -

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i using opencv function cvputtext, seems won't execute or overwritten. here block of code:

          ... if(showresult==1){          cvnamedwindow("znak", cv_window_autosize);         cvshowimage("znak", znak);          if(result == 0){             ascii_result = "a";             cvset(znak, cvscalar(26,26,26));             cvputtext(znak, "a", cvpoint(13, 185), &font, cvscalar(255, 166, 44, 0));             printf("a working");         }         if(result == 1){             ascii_result = "b";             cvset(znak, cvscalar(26,26,26));             cvputtext(znak, "b", cvpoint(13, 185), &font, cvscalar(255, 166, 44, 0));             printf("b working");         }           ...

it isn't in loop. problem is, window "znak" created, cvset() , cvputtext won't execute or overwritten...so see blank window deafult gray color

cvshowimage should put every time made change image , want show it.

      ...     if(showresult==1){      cvnamedwindow("znak", cv_window_autosize);     cvshowimage("znak", znak);      if(result == 0){         ascii_result = "a";         cvset(znak, cvscalar(26,26,26));         cvputtext(znak, "a", cvpoint(13, 185), &font, cvscalar(255, 166, 44, 0));         cvshowimage("znak", znak);         printf("a working");     }     if(result == 1){         ascii_result = "b";         cvset(znak, cvscalar(26,26,26));         cvputtext(znak, "b", cvpoint(13, 185), &font, cvscalar(255, 166, 44, 0));         cvshowimage("znak", znak);         printf("b working");     }       ...

when call cvshowimage sends copy of image window. if change image in code not change in window, since it's copy of older image.


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