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摘自MSDN:

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kbhit() Does Not Take Character out of Buffer

Article Last Modified on 03-26-2002

The information in this article applies to:

The C Run-Time (CRT)

Microsoft C for MS-DOS

Microsoft C for OS/2

Microsoft C/C++ for MS-DOS

Microsoft Visual C++ for Windows, 16-bit edition 1.0, 1.5

Microsoft Visual C++, 32-bit Editions 1.0, 2.0, 4.0, 5.0, 6.0

Microsoft Visual C++ .NET (2002)

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NOTE: Microsoft Visual C++ NET (2002) supported both the managed code model that is provided by the .NET Framework and the unmanaged native Windows code model. The information in this article applies to unmanaged Visual C++ code only.

Summary

When an application tests the value returned by the kbhit() function, the application must explicitly remove the character from the keyboard buffer after entering the keystroke. Otherwise, kbhit() continues to return TRUE.

The following code example demonstrates the situation:

Sample Code

/*

* Compiler options needed: None

*/

#include

void main(void)

{

while (!kbhit())

; // Waits for keystroke

while (kbhit())

getch(); // Empties buffer

while (!kbhit())

; // Waits for keystroke

}

kbhit()不會(huì)清空緩沖區(qū)內(nèi)容,一旦有鍵盤(pán)事件,必須使用getch()清空緩存,至于為什么cin.sync();會(huì)不能清空緩存我也不太清楚，可能與編譯器有關(guān)

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