C ++如何使用ESC按钮终止我的程序

问题描述

这里是我的主要功能我使用visual studio 2012 express和代码工作正常。我的问题是当用户按ESC按钮而不是-1时，我将如何终止这个循环。虽然我更喜欢一个解决方案，在unix和窗口，如果不可能，我最感兴趣的工作在windows。

Here is my main function i use visual studio 2012 express and the code works fine. My question is how will i terminate this loop when the user Presses the ESC button instead of -1. Although i would prefer a solution that works both in unix and windows, if it is not possible i am most interested in it working for windows.

int _tmain(int argc, _TCHAR* argv[])
{
list mylist;

int value;
cout<<"Give the numbers you want to insert to the list, press -1 to stop\n";
do
{
    cin>>value;
    mylist.insertf(value);
    mylist.sort_list();
    mylist.print();
}while(value!=-1);




}

推荐答案

以下是Windows解决方案：

当用户开始输入时，Esc将不被处理，直到按回车。
将处理空闲Esc

#include <Windows.h>
#include <iostream>
#include <conio.h>
#include <vector>
int main(int argc, char **argv)
{
    int value=0;
    std::vector<int> mylist; 
    do
    {   
        //check if any input.
        if (_kbhit()){
            //probable user started to type 
            //block to read till the user press Enter. If you want to handle Esc here .
            //then you should manually do input reading . I will write that solution later
            std::cin>>value; 
            //if success
            if(std::cin.good()){ 
                mylist.push_back(value); 
            }else{
                //firstly, clear error flag 
                std::cin.clear();
                //ignore 
                std::cin.ignore(10000,'\n');

            }

            //print  list
            std::cout<<"new list: { " ;
            for(int i=0;i< mylist.size();i++){
                std::cout<<mylist[i]<<'\t';
            }
            std::cout<<" }"<<std::endl;
        }

        //check if Esc Pressed
    }while(GetAsyncKeyState(VK_ESCAPE)==0);

    return 0;
}

第二个解决方案：

Esc将始终在另一个线程中处理。在某些情况下，可能不希望立即退出

DWORD WINAPI CheckEscape( LPVOID lpParam ) {
        while(GetAsyncKeyState(VK_ESCAPE)==0){
            //sleep 
            Sleep(10);
        }
        exit(0);

}



int main(int argc, char **argv)
{
    int value=0;
    std::vector<int> mylist; 
    //create thread for handling ESC key
    CreateThread( NULL, 0, CheckEscape,NULL  , 0, NULL);

    //loop infinitely
    while(true)
    {    
            std::cin>>value; 
            //if success
            if(std::cin.good()){ 
                mylist.push_back(value); 
            }else{
                //firstly, clear error flag 
                std::cin.clear();
                //ignore 
                std::cin.ignore(10000,'\n');

            }

            //print  list
            std::cout<<"new list: { " ;
            for(int i=0;i< mylist.size();i++){
                std::cout<<mylist[i]<<'\t';
            }
            std::cout<<" }"<<std::endl;
        }  
    return 0;
}

第三个解决方案和最好的一个。手动

手动处理按键。
当Esc被按下时退出。

Third Solution and the Best one .Do everything manually

Handling keypress manually.Exit will be called when Esc is Pressed. You can change it to handle more right way

bool keypress( char &key){
    INPUT_RECORD IR[1];
    DWORD read;
    static HANDLE h = GetStdHandle(STD_INPUT_HANDLE);
    while(PeekConsoleInputA(h,IR,1,&read)){
        if(read!=0){
            //check if it was Key Event
            if(IR[0].EventType==KEY_EVENT){
                key=IR[0].Event.KeyEvent.uChar.AsciiChar; 
                ReadConsoleInputA(h,IR,1,&read);
                FlushConsoleInputBuffer(h);
                return true;
            }
            if(ReadConsoleInputA(h,IR,1,&read)){
                continue; 
            }
        }else{
            return false;
        }
    }
}

//getnumber
int cinnumb( ){
    char buffer[32];
    buffer[0]='\0';
    int count=0;
    DWORD key=-1;
    while(true){

        Sleep(100);
        do{
            //here I make it nonblockin keypress
            //but actually we do not need it 
            //we can use blocking ReadConsoleInputA(h,IR,1,&read);
            //this way we not even need sleep() and 
            //our keypress function will be simple
            //anyway im posting nonblocking one

            //nonblocking keypress
            char key=0;
            bool isOk=keypress(key );

            if(!isOk ){ 
                Sleep(20);
                continue;
            }

            if(key>='0' && key<='9'){
                buffer[count]=key; 
                std::cout<<key;
                ++count;
                if( count==31)break;

            }

            // check Enter key and  enough symbol
            if(  key==13 && count>0  ){  
                std::cout<<std::endl;
                break;
            }

            //for windows 

            //check if Esc pressed
            if(key==27) exit(0); 


        }while(true);

        buffer[count]='\0';

        int value=atoi(buffer);
        return value;
    }
}
int main(int argc, _TCHAR* argv[])
{
    std::vector<int> mylist; 
    int value; 
    char buffer[100];
    //infinite loop
    while(true)
    {   
        //get number 
        value=cinnumb(); 
        mylist.push_back(value);
         //print  list
        std::cout<<"new list: { " ;
        for(int i=0;i< mylist.size();i++){
                std::cout<<mylist[i]<<'\t';
            }
        std::cout<<" }"<<std::endl;
        //sleep a little
        Sleep(10); 
    } ;


    return 0;

}

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