CBlock block; block.ReadFromDisk(12345);
std::string filename = "block.dat"; CBlock block; if (LoadBlockFromDisk(filename, block)) { // block was successfully loaded }In this example, the function LoadBlockFromDisk is used to read a block from a file specified by "filename". If successful, the CBlock object "block" is updated with the block's information. The CBlock class and its member functions are part of the Bitcoin Core library package.