/C++/Read large files part by part in C++

Read large files part by part in C++

// Buffer size 1 Megabyte (or any number you like)
size_t buffer_size = 1<<20;
char *buffer = new char[buffer_size];

std::ifstream fin("input.dat");

while (fin)
{
    // Try to read next chunk of data
    fin.read(buffer, buffer_size);
    // Get the number of bytes actually read
    size_t count = fin.gcount();
    // If nothing has been read, break
    if (!count) 
        break;
    // Do whatever you need with first count bytes in the buffer
    // ...
}

delete[] buffer;

Source: stackoverflow.com

Similar codes

8 votes177 views5 answers
Resize vector c++
C++
0 vote180 views1 answer
C2079 'stream' uses undefined class 'std::basic_ifstream<char,std::char_traits<char>>'
C++
1 vote186 views1 answer
C++ functions inside functions
C++
0 vote182 views1 answer
Find maximum sum of circular subarray
C++
0 vote167 views1 answer
C++ const shared_ptr
C++
0 vote184 views1 answer
C++ move second line
C++
1 vote167 views1 answer
Visual studio cpp compiler
C++
-1 vote176 views2 answers
Vector to char array c++
C++
1 vote160 views1 answer
Copy a part of a vector in another in c++
C++
0 vote184 views1 answer
Std::is_standard_layout
C++