如何讓我的程序「忘記」我在鍵盤上按下的字母？

Question

對不起，這是愚蠢的方式，但我不知道怎麼說技術。

我的程序是打字訓練。如果用戶寫的字母（userWord [i]，從鍵盤上用getch（））獲得的字母與我給他的單詞中的相應字母不相同，我想發出聲音（filas [maxIndex] [i] ）。我的代碼工作正常，除了如果例如我給他「你好」，並且他寫道「heklo」，因爲他寫得非常快，失敗聲音將播放3次（對於k，l，o）。我想以某種方式釋放鍵盤的緩衝區（我認爲這是說「忘記我按下的字母」的技術方式），用戶不用'k'，'l'，'o '被存儲並作爲userWord [我]，我試過fflush但沒有工作。

我使用Visual Studio

printf("\n\n%s\n", filas[maxIndex]); //Here it prints "Alba" 

    cont = 1; 

    while (cont == 1) { 
     i = 0; 
     while (userWord[i] != ' ') { // the user presses space to make the program know he has completed his word and wants to go to the next one 

       while (!kbhit()) {} 
       fflush(stdin); //I believe this should free the keyboard buffer? 
       userWord[i] = getch(); 
       printf("%c", userWord[i]); //prints each letter the user writes each time the loop is executed, then he presses space to exit 


      if (userWord[i] != filas[maxIndex][i]) { 

       PlaySound(TEXT("failSound.wav"), NULL, SND_SYNC); //MY PROBLEM 
       cont = 1; 
       Sleep(8); 
       printf("\n"); //now the user should start writing his word again from the beginning 
       break; 
      } 
      else if (filas[maxIndex][i + 1] == '\0') { 
       cont = 0; 
       i++; 
       break; 
      } 
      else { cont = 0; } 

      i++; 
     } 
     if (cont == 0) { 
      userWord[i] = '\0'; 

      if (length != length2) { //calculated before, but irrelevant to my problem 
       cont = 1; 
       Sleep(8); 
       printf("\n\n%s\n", filas[maxIndex]); 
      } 
     } 
    } 

    if (cont != 3) { 

     while (!kbhit()) {} 
     option = getch(); // if option = '2' the user closes the program and if it equals ' ' the next word if obtained with a function and the loop begins again. 
    } 
    } 

我的問題是，如果他類型的快，因爲他想盡快結束，他會做出一個拼寫錯誤（寫入「AKBA」，而不是「阿爾巴」）和FailSound打3次。我想在做出錯誤時忽略用戶輸入的其餘部分，但我不知道如何去做。

Answer 1

你試圖混合直接處理鍵盤輸入的低級conio輸入函數和更高級別的stdio輸入函數，這些輸入函數只能在返回命中後才能使用的過濾輸入緩衝區上運行。

這意味着，正如@PaulR所解釋的那樣，您的fflush(stdin)在此上下文中沒有用處，應該作爲非標準來避免。

Sleep將輸入值的程序暫停爲毫秒。就我而言，我無法在8毫秒內做任何事情！所以，你的循環的初始部分將變成：

while (userWord[i] != ' ') { // the user presses space to make the program know he has completed his word and wants to go to the next one 

      /*while (!kbhit()) {} 
      fflush(stdin); // All this is useless */ 
      userWord[i] = getch(); // get next char from keyboard 
      printf("%c", userWord[i]); //prints each letter the user writes each time the loop is executed, then he presses space to exit 


     if (userWord[i] != filas[maxIndex][i]) { 

      PlaySound(TEXT("failSound.wav"), NULL, SND_SYNC); //MY PROBLEM 
      cont = 1; 
      // Sleep(8); useless 
      printf("\n"); //now the user should start writing his word again from the beginning 
      while (kbhit) { getch(); } // empties keyboard event queue 
      break; 
     }