CODEWITHSUNDEEP
c++filec++11error-handlingcompiler-errors
giorgioW
giorgioW

Reputation: 331

Compilation error in C++ reading files

I've compiled a .cpp file with g++ and the only errors I had were like this:

histogram.cpp:24:26: error: ignoring return value of ‘size_t fread(void*, size_t, size_t, FILE*)’, declared with attribute warn_unused_result [-Werror=unused-result]
 fread(&altura,4,1,fp);
                      ^

I know I'm using a very restrictive flags which treat warnings as errors, but trying to fix this errors I failed, so if someone can bring some light in this problem I'll be very pleased. The flags I'm using are:

g++ -std=c++11 -Wall -Werror -O3  histogram.cpp -o histogram

Thank you.

Upvotes: 1

Views: 1908

Answers (1)

Leo Chapiro
Leo Chapiro

Reputation: 13984

I guess you don't use the return value of "fread", you need something like this:

  size_t result = fread (buffer, 1, lSize, pFile);
  if (result > 0) 
  // do smthng

instead of 

fread (buffer,1,lSize,pFile);

Upvotes: 3

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