如何从 boost::asio::streambuf 获取二进制数据

Question

如何将数据从 streambuf 刷新到文件？我试过了

read(*socket_, streamBuf, boost::asio::transfer_at_least(694784))
std::istream is(&streamBuf);
std::ofstream outfile;
outfile.open ("test.exe");
is >> outfile;
outfile.close()

但这没有用。任何线索如何做到这一点？

Answer 1

你可以试试一个buffer_cast. 下面是一个例子：

boost::asio::streambuf buf;
size_t bytes = read( *socket_, buf, boost::asio::transfer_at_least(694784) );
buf.commit( bytes );

std::ofstream outfile( "test.exe" );
outfile << boost::asio::buffer_cast<const char*>( buf.data() );