c++ - Detect a blank string value -

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I'm reading from an ascii file, which contains the information from the file, the file appears

1,434,341,158,498 , ... until the end of one line of pixels does not end, the next pixel line starts below 5,316,211,323,269, ... until all the pixels are covered, repeating them.

I am trying to use getline () to write these data values ​​in an array for processing. The part of my code responsible for the value is as follows: 

  while (! Asciiimage.eof ()) {string pixelvalue; Getline (Eskim, Pixelview, ','); Cout & lt; & Lt; Pixelvalue & lt; & Lt; Endl; }

Finish this by the end of the file. It works fine for a single line of pixels, though at the end of the line of pixels the cout looks like this: 

  115 134 465 200

With the difference between values ​​I will find out the difference I have tried to use it 

  pixelvalue.length (); Pixelvalue.size ();

But both of them failed. How can I find out more about this empty value of PixelValue?

if 

  if (pixelvalue.length () == 0 )

does not help, so it is not empty, but there are some spaces in it. In particular, the last element of the line is a new facet. Trim the string before checking for emptiness 

  boost :: trim (pixelvalue); If (PixelView (MTP)) ...

For more information about trimming.

Alternatively, read the entire line in the first row without any string, then read the value from the string, 

  string line; While (gateline (file, line)) {// Optionally trim the line here Istingstream release (line); string value; While gateline (ash, value, ',') comment <

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