How Do I Send Binary Data Over the Network Using C++?

In the C++ edition, binary data is sent just like any other data. Methods that send binary data, such as the SendBytes method of the TCPClient component, take two arguments: a pointer to the data, and the length of the data in bytes. Since the length is specified explicitly, the data may contain any byte values, including null bytes.

TCPClient tcpclient; int ret = tcpclient.ConnectTo("server.example.com", 7777); if (ret == 0) { // Send five bytes of binary data, including a null byte. const char data[] = { 0x00, 0x01, 0x7F, (char)0x80, (char)0xFF }; ret = tcpclient.SendBytes(data, sizeof(data)); } if (ret != 0) { printf("Error %d: %s\n", ret, tcpclient.GetLastError()); }

Note that in older versions of IPWorks, data was sent using the SetDataToSend method, which took the same two arguments.