Class: Cups::PrintJob

Inherits:
Object
  • Object
show all
Defined in:
lib/cups/print_job/transient.rb,
ext/cups.c

Direct Known Subclasses

Transient

Defined Under Namespace

Classes: Transient

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#new(filename, printer = nil) ⇒ Object

Initializes a new PrintJob object. If no target printer/class is specified, the default is chosen. Note the specified file does not have to exist until print is called.



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# File 'ext/cups.c', line 54

static VALUE job_init(int argc, VALUE* argv, VALUE self)
{
  VALUE filename, printer, job_options;
  
  rb_scan_args(argc, argv, "12", &filename, &printer, &job_options);
  
  rb_iv_set(self, "@filename", filename);
  
  if (NIL_P(job_options)) {
    rb_iv_set(self, "@job_options", rb_hash_new());
  } else {
    rb_iv_set(self, "@job_options", job_options);
  }

  if (NIL_P(printer)) {

    // Fall back to default printer
    VALUE def_p = rb_funcall(rubyCups, rb_intern("default_printer"), 0);

    if (def_p == Qfalse) {
			rb_raise(rb_eRuntimeError, "There is no default printer!");
		} else {
			rb_iv_set(self, "@printer", def_p);
		}
    
  } else {
    if (printer_exists(printer)) {
      rb_iv_set(self, "@printer", printer);
    } else {
      rb_raise(rb_eRuntimeError, "The printer or destination doesn't exist!");
    }
  }
  return self;
}

Instance Attribute Details

#filename ⇒ Object (readonly)

#job_id ⇒ Object (readonly)

#job_options ⇒ Object (readonly)

#printer ⇒ Object (readonly)

Cups::PrintJob Attributes

Instance Method Details

#cancel ⇒ Boolean

Cancel the current job. Returns true if successful, false otherwise.

Returns:

  • (Boolean) 


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# File 'ext/cups.c', line 208

static VALUE cups_cancel(VALUE self)
{
  VALUE printer, job_id;
  printer = rb_iv_get(self, "@printer");
  job_id = rb_iv_get(self, "@job_id");
  
  if (NIL_P(job_id)) {
    return Qfalse; // If @job_id is nil
  } else { // Otherwise attempt to cancel
    int job = NUM2INT(job_id);
    char *target = RSTRING_PTR(printer); // Target printer string
    int cancellation;
    cancellation = cupsCancelJob(target, job);
    return Qtrue;
  }
}

#completed? ⇒ Boolean

Has the job completed?

Returns:

  • (Boolean) 


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# File 'ext/cups.c', line 323

static VALUE cups_job_completed(VALUE self)
{
  VALUE job_id = rb_iv_get(self, "@job_id");
  VALUE printer = rb_iv_get(self, "@printer");
  VALUE jstate;

  int num_jobs;
  cups_job_t *jobs;
  ipp_jstate_t job_state = IPP_JOB_PENDING;
  int i;
  char *printer_arg = RSTRING_PTR(printer);

  if (NIL_P(job_id)) {
    return Qfalse;
  } else {
    num_jobs = cupsGetJobs(&jobs, printer_arg, 1, -1); // Get jobs
    // job_state = IPP_JOB_COMPLETED;

    for (i = 0; i < num_jobs; i ++) {
      if (jobs[i].id == NUM2INT(job_id)) {
        job_state = jobs[i].state;
        break;
      }
      
      // Free job array
      cupsFreeJobs(num_jobs, jobs);
      
      if (job_state == IPP_JOB_COMPLETED) {
        return Qtrue;
      } else {
        return Qfalse;
      }
      
    }
  }  
}

#error_code ⇒ Fixnum

Get the last IPP error code.

Returns:

  • (Fixnum) 


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# File 'ext/cups.c', line 266

static VALUE cups_get_error_code(VALUE self)
{
  VALUE job_id = rb_iv_get(self, "@job_id");
  
  if (NIL_P(job_id) || !NUM2INT(job_id) == 0) {
    return Qnil;
  } else {
    VALUE ipp_error_code = INT2NUM(cupsLastError());
    return ipp_error_code;
  }
}

#error_reason ⇒ String

Get the last human-readable error string

Returns:

  • (String) 


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# File 'ext/cups.c', line 248

static VALUE cups_get_error_reason(VALUE self)
{
  VALUE job_id = rb_iv_get(self, "@job_id");
  
  if (NIL_P(job_id) || !NUM2INT(job_id) == 0) {
    return Qnil;
  } else {
    VALUE error_exp = rb_str_new2(cupsLastErrorString());
    return error_exp;
  }
}

#failed? ⇒ Boolean

Did this job fail?

Returns:

  • (Boolean) 


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# File 'ext/cups.c', line 231

static VALUE cups_job_failed(VALUE self)
{
  VALUE job_id = rb_iv_get(self, "@job_id");

 if (NIL_P(job_id) || !NUM2INT(job_id) == 0) {
   return Qfalse;
 } else {
   return Qtrue;
 }
}

#print ⇒ Fixnum

Submit a print job to the selected printer or class. Returns true on success.

Returns:

  • (Fixnum) 


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# File 'ext/cups.c', line 108

static VALUE cups_print(VALUE self)
{
  int job_id;
  VALUE file = rb_iv_get(self, "@filename");
  VALUE printer = rb_iv_get(self, "@printer");

  char *fname = RSTRING_PTR(file); // Filename
  char *target = RSTRING_PTR(printer); // Target printer string

  FILE *fp = fopen(fname,"r");
  // Check @filename actually exists...
  if( fp ) {
    fclose(fp);

    VALUE job_options = rb_iv_get(self, "@job_options");

    // Create an array of the keys from the job_options hash
    VALUE job_options_keys = rb_ary_new();
    rb_hash_foreach(job_options, cups_keys_i, job_options_keys);
  
    VALUE iter;
    int num_options = 0;
    cups_option_t *options = NULL;

    // foreach option in the job options array
    while (!  NIL_P(iter = rb_ary_pop(job_options_keys))) {

      VALUE value = rb_hash_aref(job_options, iter);

      // assert the key and value are strings
      if (NIL_P(rb_check_string_type(iter)) || NIL_P(rb_check_string_type(value))) {
        cupsFreeOptions(num_options, options);
        rb_raise(rb_eTypeError, "job options is not string => string hash");
        return Qfalse;
      }

      // convert to char pointers and add to cups optoins
      char * iter_str  = rb_string_value_ptr(&iter);
      char * value_str = rb_string_value_ptr(&value);
      cupsAddOption(iter_str, value_str, num_options++, &options);
    }

    job_id = cupsPrintFile(target, fname, "rCUPS", num_options, options); // Do it. "rCups" should be the filename/path

    cupsFreeOptions(num_options, options);

    rb_iv_set(self, "@job_id", INT2NUM(job_id));

    return Qtrue;
  } else {
  // and if it doesn't...
    rb_raise(rb_eRuntimeError, "Couldn't find file");
    return Qfalse;
  }
}

#state ⇒ String

Get human-readable state of current job.

Returns:

  • (String) 


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# File 'ext/cups.c', line 284

static VALUE cups_get_job_state(VALUE self)
{
  VALUE job_id = rb_iv_get(self, "@job_id");
  VALUE printer = rb_iv_get(self, "@printer");
  VALUE jstate;
  
  int num_jobs;
  cups_job_t *jobs;
  ipp_jstate_t job_state = IPP_JOB_PENDING;
  int i;
  char *printer_arg = RSTRING_PTR(printer);
 
  if (NIL_P(job_id)) {
    return Qnil;
  } else {
    num_jobs = cupsGetJobs(&jobs, printer_arg, 1, -1); // Get jobs

    for (i = 0; i < num_jobs; i ++) {
      if (jobs[i].id == NUM2INT(job_id)) {
        job_state = jobs[i].state;
        break;
      }
    }

    // Free job array
    cupsFreeJobs(num_jobs, jobs);
 
    jstate = ipp_state_to_symbol(job_state);

    return jstate;
  }
}