添加对递归函数的控制 [英] Add control over recursive function

问题描述

Hello All，下面我附上了一个代码，我需要一个关于递归函数的控件。意思是，它应该等待我的按钮按下信号进一步移动。

Hello All, below i attached a code where i need a control on recursive function. Means, it should wait for my button press signal to move further.

void PlaySongs::performance(int step){

step++;

if (waitForInterruptSys (iOnePin, -1) >0)
{
   cout<<"Push Button is pressed"<<endl;

   SoundNamespace::SoundProject::SoundProject project;

   project.Init();
   project.InitSound();
   
   project.StartInterruptThreads();
   project.LoadProject();
   project.AdjustSounds();
   project.LoadSounds(true);
   project.StartPlayingSounds();
   
   cout << "Initialization finished." << endl;

// Some C++ control statement NEEDS here  <--

/* here i need control, so that, after button pressed on bread board, it should move further i.e. perform next statements, otherwise wait infinite time. something like cvWaitKey(0) from opencv. Interrupt detected by (waitForInterruptSys (iOnePin, -1) >0). like written above. */

if(step==3)
     return;
else
    performance(step);

}

我试过

I tried

int first = std::cin.get();
std::cin.ignore(256, 'waitForInterruptSys (iOnePin, -1) >0');   ---> NOt sure, because i don't why std:: is not detecting ignore function and not at all confident on second parameter of ignore function

任何人都可以推荐一些东西？在此先感谢。

Anybody can suggest something ?? Thanks in advance.

推荐答案

如果（waitForInterruptSys（iOnePin，-1）表示按下按钮，请将 if 语句更改为a while 声明...

If "(waitForInterruptSys (iOnePin, -1)" represents your button press, change the if statement to a while statement ...

if (waitForInterruptSys (iOnePin, -1) >0)
{
   cout<<"Push Button is pressed"<<endl;

...变成......

... becomes ...

while (waitForInterruptSys (iOnePin, -1) <= 0) NULL;
cout<<"Push Button is pressed"<<endl;

NULL只是一个占位符，因为while语句（如if）需要一个语句。这有效地说while（没有按下按钮）什么都不做。

The "NULL" is just a placeholder since the while statement (like the if) expects a statement to follow. This effectively says "while (no button is pressed) do nothing".

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