如何使用gettickcount（）每隔x间隔时间在switch中调用case

Question

我有此开关，我需要在C ++中使用gettickcount（）每隔x秒执行一次case。 在此先感谢，对不起我的西班牙文：D

int x = rand() % 4;
            switch(x)
            {
               case 0:
                  GCChatTargetSend(lpObj,lpObj->Index,"String message 1 Here");
                  break;

               case 1:
                  GCChatTargetSend(lpObj,lpObj->Index,"String message 2 Here");
                  break;

               case 2:
                  GCChatTargetSend(lpObj,lpObj->Index,"String message 3 Here");
                  break;

               case 3:
                  GCChatTargetSend(lpObj,lpObj->Index,"String message 4 Here");
                  break;
            }

Answer 1

这是一些有关如何将GetTickCount( )设置为间隔计时器的代码：

首先你有时间

StartTime = GetTickCount( )

然后您添加另一个计时器

EndTime = GetTickCount( )

并从StartTime中减去EndTime

DeltaTime = EndTime - StartTime

然后将DeltaTime与EveryMillisecondTask进行比较。 如果结果为true ，则生成一个随机数，该随机数与您设置的switch语句中的数字相对应，该随机数又将调用GCChatTargetSend( ) 。

if ( DeltaTime >= EveryMillisecondTask ){
    int x = rand() % 4;

       switch(x){
          // do stuff
       }
}

这是GetTickCount( )的完整代码清单：

#include <time.h>
#include <windows.h>
#include <iostream>
#include <string>

using namespace std;

void GCChatTargetSend( string message );

int main() {

    int EveryMillisecondTask=1000;  // 1 second = 1000 milliseconds
    int StartTime = GetTickCount();
    srand (time(NULL));

    cout<<"Welcome to  GetTickCount() interval timer \n  \n";
    cout<<"Interval set to "<< EveryMillisecondTask <<"  milliseconds  \n";


    while( true ){

        int EndTime = GetTickCount();
        int DeltaTime = EndTime - StartTime;

        // test to see if EveryMillisecondTask  matches time
        if ( DeltaTime >= EveryMillisecondTask ){

            // generate random number 
            int x = rand() % 4;
            cout<<"\nRandom X= "<< x+1 <<"\n";

               // switch x
               switch(x){
                   case 0:
                            GCChatTargetSend("String message 1 Here   ");                      
                      break;

                   case 1:
                            GCChatTargetSend("String message 2 Here   ");                      
                      break;

                   case 2:
                            GCChatTargetSend("String message 3 Here   ");                      
                      break;

                   case 3:
                            GCChatTargetSend("String message 4 Here   ");                      
                      break;

                    default:  

                    break;
                }

            // reset time
            StartTime = GetTickCount();
            EndTime = GetTickCount();
        }

    }//while

return 0;
}

void GCChatTargetSend( string message ){
    cout<<message<<"  \n";
}

这是使用Windows自己的settimer( )函数执行间隔计时器的方法。

https://msdn.microsoft.com/zh-CN/library/windows/desktop/ms644906(v=vs.85).aspx

settimer( )示例代码：

#define STRICT 1 
#include <windows.h>
#include <iostream.h>

VOID CALLBACK TimerProc(HWND hWnd, UINT nMsg, UINT nIDEvent, DWORD dwTime);

int main(int argc, char *argv[], char *envp[]){

    int Counter=0;
    MSG Msg;
    int timeInMilliseconds = 2000;

    cout<<"Welcome to  SetTimer( ) interval timer \n  \n";
    cout<<"Interval set to "<< timeInMilliseconds <<"  milliseconds  \n\n\n";

    UINT TimerId = SetTimer(NULL, 0, timeInMilliseconds, &TimerProc); //2000 milliseconds

    cout << "TimerId: " << TimerId << '\n';
    if (!TimerId)  return 16;

   while (GetMessage(&Msg, NULL, 0, 0)){
        ++Counter;
        if (Msg.message == WM_TIMER) cout << "Counter: " << Counter << "; timer message\n";
        else
        cout << "Counter: " << Counter << "; message: " << Msg.message << '\n';

        DispatchMessage(&Msg);
    }

   KillTimer(NULL, TimerId);

return 0;
}

VOID CALLBACK TimerProc(HWND hWnd, UINT nMsg, UINT nIDEvent, DWORD dwTime){

  cout << "CALLBACK " << dwTime << " \n\n";
  cout.flush();
}