Add control over recursive function

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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.

C++

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);

}

I tried

C++

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

Anybody can suggest something ?? Thanks in advance.

Posted 14-Aug-15 11:29am

Member 11292470

Updated 14-Aug-15 11:49am

v2

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bling · Answer 1 · 2015-08-14T12:41:00

Solution 1

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

C++

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

... becomes ...

C++

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

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".

Posted 14-Aug-15 12:41pm

bling

Updated 14-Aug-15 12:42pm

v2

Comments

Philippe Mori 14-Aug-15 20:25pm

I would suggest to always write { } around a block even if it contains a single statement and in particular use { } to show that nothing is done.

Sergey Alexandrovich Kryukov 14-Aug-15 21:27pm

{} is a good idea, but { and } around a single statement is just a matter of taste. Perhaps it is easier to add more statements but no more readable in final code, takes more lines for no real reason. It depends on point of view.
—SA

Member 11292470 15-Aug-15 2:50am

@bling -

while (waitForInterruptSys (iOnePin, -1) <= 0)
NULL;
cout<<"Push Button is pressed"<<endl; <------------------- This statement will executed then. i want to gain control over block of code whicht start with { cout<<..... till end }