(MFC) Send UTF-16 on TCP or TLS Socket

See more Socket/SSL/TLS Examples

Demonstrates how to send a string on a connected TCP or SSL/TLS socket such that it is the utf-16 byte representation that is sent.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkSocket.h>
#include <CkStringBuilder.h>

void ChilkatSample(void)
    {
    CkString strOut;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkSocket socket;

    bool tls = false;
    int maxWaitMs = 20000;
    const char *domainOrIpAddr = "example.com";
    int port = 1234;

    // Connect to the whatever is expecting our connection...
    bool success = socket.Connect(domainOrIpAddr,port,tls,maxWaitMs);
    if (success != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Let's say we have an XML file saved in the utf-16 byte representation,
    // and we want to send it over the connection using the utf-16 byte representation...

    // First the file into a Chilkat StringBuilder.
    // Tell the LoadFile method that we are reading utf-16 bytes..
    CkStringBuilder sbXml;
    success = sbXml.LoadFile("qa_data/xml/myUtf16.xml","utf-16");
    if (success != true) {
        strOut.append("Failed to load utf-16 XML file..");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Tell the socket object that we wish to send the utf-16 byte representation of the string.
    socket.put_StringCharset("utf-16");

    // Send the string as utf-16 bytes.
    success = socket.SendSb(sbXml);
    if (success != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Let's say we wanted to instead send the string as utf-8 bytes.
    // Just tell the socket object...
    socket.put_StringCharset("utf-8");

    // Send the string as utf-8 bytes.
    success = socket.SendSb(sbXml);
    if (success != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // If our XML file was utf-8, then just tell the StringBuilder that we're reading utf-8.
    // Once the text is properly contained in the StringBuilder, we can send the contents in any other charset (windows-1252, utf-16, utf-8, etc.) 
    // as long as it make sense (i.e. we obviously can't send Japanese text using a single-byte charset such as Windows-1252).
    success = sbXml.LoadFile("qa_data/xml/myUtf8.xml","utf-8");
    if (success != true) {
        strOut.append("Failed to load utf-8 XML file..");
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Send as utf-16
    socket.put_StringCharset("utf-16");

    // Send the string as utf-16 bytes.
    success = socket.SendSb(sbXml);
    if (success != true) {
        strOut.append(socket.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // ...
    // ...


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }