recompiling changed library code [solved]

[SupArdu]

hi,

I want to develop an application based on the library SimpleSDAudio.
Everything works ok if I run the examples included with the library.

After changing some C-code in the library sources these changes are not compiled when compiling the sketch. Always the original code is used.
For example I added a variable, anzsect, in the public area of the class definition in SimpleSDAudio.h and wanted to print it with Serial.print.
The compiler outputs the error: 'class SdPlayClass' has no member named 'anzsect'.

What shall I do to get the changed code of the library compiled?
I am confused !

SupArdu

[UKHeliBob]

I added a variable, anzsect, in the public area of the class definition in SimpleSDAudio.h and wanted to print it with Serial.print.

How exactly are you trying to print it ?

If you posted your code it would be easier to provide help.

[SukkoPera]

Go into the preferences, check "Use external editor". Close the prefs. Compile. Reopen prefs, uncheck that option. Or switch to an external editor for real :). I like Geany.

[SupArdu]

hi,

the tip of SukkoPera does not work.

Here the code:
File SimpleSDAudio.h

class SdPlayClass {
// don't change this struct from here ...
  private:
    volatile uint8_t  _flags;
    uint8_t  _flags2;           // flags not touched in interrupt
    volatile uint16_t _Buflen;  // how much bytes are availible in buffer
    uint8_t *_pBuf;             // pointer to working buffer, used for audio and all kind of file access
    volatile uint8_t *_pBufout; // pointer where next byte can read from the buffer
    uint8_t *_pBufoutend;       // points to _pBuf + _Bufsize
    uint16_t _Bufsize;          // size of working buffer, must be a multiple of 512, at least 1024    
    volatile uint16_t _Bufin;   // index where next byte can put into the buffer
	uint16_t _BufsizeMinus512;	// used to avoid one calculation every time
	volatile uint8_t _WorkTrig; // counter to autotrigger worker
// ...to here as it is adressed directly by assembler functions!
    ...
public:
    SdPlayClass(void);  // constructor
    ~SdPlayClass(void); // destructor
    
	uint32_t anzsect;    // this is the inserted code for test purposes <------------
    void    interrupt(void);
...

In SimpleSDAudio.cpp there is a function definition where I added 1 line too.
The else path is really performed. Otherwise the program woud not work at all:

boolean SdPlayClass::setFile(char *fileName) {
  if(!_pBuf) {
    _lastError = SSDA_ERROR_NOT_INIT;
    return(false);
  }
  uint8_t retval;
  stop();
  _fileinfo.Size = 0;
  retval = SD_L2_SearchFile((uint8_t *)fileName, 0UL, 0x00, 0x18, &_fileinfo);
  
  if(retval) {
     _lastError = retval;
     return(false);
  } else {
		start_sec_file = _fileinfo.ActSector;
		act_playlist_index = 0;
		_fileinfo.ActSector = start_sec_file + playlist_anfsec[act_playlist_index];
		rest_anzsec = playlist_anzsec[act_playlist_index];
		Serial.print("filesize=");
		Serial.println(_fileinfo.size);
		anzsect = _fileinfo.size/512;   // this line inserted for test <-------------
     return(true);
  }
}

And now the sketch ( I have an UNO):

void setup()
{ 
  Serial.begin(9600);
  // If your SD card CS-Pin is not at Pin 4, enable and adapt the following line:
  // SdPlay.setSDCSPin(10);
  
  // Init SdPlay and set audio mode
  if (!SdPlay.init(SSDA_MODE_FULLRATE | SSDA_MODE_MONO)) {
    while(1); // Error while initialization of SD card -> stop.
  } 
  
  // Select file to play
  if(!SdPlay.setFile("EXAMPLE.AFM")) {
    while(1); // Error file not found -> stop.
  }   
      Serial.print(F("max. Zahl Sektoren="));   // this line is inserted and is compiled and executed
      Serial.print(SdPlay.anzsect);   // on this line the compiler reports the error
      
  // Start playback
  SdPlay.play();
  
  // Let the worker work until playback is finished
  while(!SdPlay.isStopped()) {
      SdPlay.worker();
  }
}

When I delete the line where the error is reported everything is ok.

Where is the library installed?

The library is installed in H:\Arduino\examples\SimpleSDAudio
All my editing is performed also in this location. For editing I am using Notepad++.
a frustrated SupArdu

[UKHeliBob]

Serial.print(SdPlay.anzsect);   // on this line the compiler reports the error

You have a variable named anzsect in the library not a method (function) named anzsect hence the error message

'class SdPlayClass' has no member named 'anzsect'.

[SupArdu]

I am really not the expert for object oriented programming , but ...

Isn't it possible to access the variables in the public area of an object from outside the object?
What else does it mean "public"?

I will try it with a function returning the value of anzsect.

[SupArdu]

It is really a problem of compiling the changed code.

Now, I added a simple function to the class SdPlayClass :

uint32_t SdPlayClass::get_anzsect(void) {
	return anzsect;
}

The print statement now is:

Serial.print(SdPlay.get_anzsect());

Again the compiler reports: 'class SdPlayClass' has no member named 'get_anzsect'

[SupArdu]

yes, of course the h-file contains

...
public:
    SdPlayClass(void);  // constructor
    ~SdPlayClass(void); // destructor
    
	uint32_t anzsect;
	uint32_t get_anzsect();
	
    void    interrupt(void);
...

In the function
boolean SdPlayClass::setFile(char *fileName)
I also added a dummy call of get_anzsect() in order to see if this function can be executed:

...
uint32_t hhv=get_anzsect();
...

But now, considering your question, I deleted the declaration of get_anzsect() in the header file.

The status now is:

• no declaration of get_anzsect() within header file
• existing definition of get_anzsect() in the cpp file
• call of get_anzsect() in the changed code of the library

In spite of calling the function within the code there is no error message during build.
Is'nt this a proof that the changed code is not used for build?

[SupArdu]

hi,

the problem is solved!
The questions where the library is located brought me on the right track.

I had the directory SimpleSDAudio twice, once in ...\examples\ and another one in ...\examples\libraries.

I guess that the IDE needs libraries in a directory named "libraries". During installation of the library I defined the path as ...\examples. But the IDE generated a folder "libraries" in the defined location and the library then in ...\examples\libraries\SimpleSDAudio.

Anyway, somebody (me? >:( ) copied the content of the library one level higher,
i.e. to ...\examples\SimpleSDAudio. Here I changed the code but the IDE used the code in
...\examples\libraries\SimpleSDAudio.

Thank you for your tips. I learned from them.

SupArdu

P.S.: how can I mark my question as "solved"?

[system]

P.S.: how can I mark my question as "solved"?

By editing the title of the first post

[SupArdu]

I cannot get into the text of the title to edit it.

The title is a link. Clicking on it for editing puts me to my first post back again.

[pert]

Click on the Quick Edit button on yourfirst post. Then you will see at the top of the first post there is a white box with the title that is editable. Edit it and then click the Save button.