控制 scanf() 接受任何输入的持续时间

Question

我考虑过控制scanf来接受c中的任何输入。我的概念是等待10秒(或任何其他时间)来接受任何输入。10秒后它将退出并且不再接收任何输入。

 int main(){
 int a,b,c,d;
 scanf("%d",&a);
 printf("10 seconds are over no more input");
 }

这里我想控制输入的时间。10秒后，输入面板将不再保留，并且将打印文本“10秒结束，不再输入”。

Answer 1

#include <windows.h>
#include <stdio.h>

int main(void){
    int num = 0;
    DWORD waitCode;
    printf("input number : ");
    //wait console input 10,000 Millisecond
    waitCode = WaitForSingleObject(GetStdHandle(STD_INPUT_HANDLE) , 10*1000);
    switch(waitCode){
    case WAIT_TIMEOUT:
        fprintf(stderr, "\n10 seconds are over no more input\n");
        return -1;
    case WAIT_OBJECT_0://normal status
        scanf("%d", &num);//input from stdin buffer
        if(num)//not zero
            printf("input number is %d\n", num);
    }
    return 0;
}

<小时/>

添加
线程版本

#include <windows.h>
#include <stdio.h>

void ThreadProc(void *);

int main(void){
    int num = 0;
    DWORD waitCode;
    DWORD ThreadID = 0;
    HANDLE hThread = CreateThread(NULL, 0,
                        (LPTHREAD_START_ROUTINE)ThreadProc,
                        (LPVOID)&num, 0, &ThreadID);
    if(!hThread){
        fprintf(stderr, "Failed to create a thread\n");
        return -1;
    }

    waitCode = WaitForSingleObject(hThread, 10*1000);   
    switch(waitCode){
    case WAIT_TIMEOUT:
        fprintf(stderr, "\n10 seconds are over no more input\n");
        break;
    case WAIT_OBJECT_0://normal status
        if(num)//not zero
            printf("input number is %d\n", num);
    }
    CloseHandle(hThread);

    return 0;
}

void ThreadProc(void *n){
    int *num = n;
    printf("input number : ");
    scanf("%d", num);
    ExitThread(0);
}