s2l4.cpp

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//####################################################################
// S2L4.cpp - (Section 2, Lesson 4) SENDING AN INTEGER TO THE TARGET
//            This is the RTDX Host Client for Section 2, Lesson 4
//
// This example sends integer value 5 to the target
//####################################################################

#import "..\..\..\..\..\cc\bin\rtdxint.dll"
#include <iostream.h>


#define VALUE_TO_SEND 5

using namespace RTDXINTLib;

int main()
{
        IRtdxExpPtr rtdx;               // holds pointer to IRtdxExp interface
        long status;                    // holds status of RTDX COM API calls
        HRESULT hr;                     // holds status of generic COM API calls
        long data=VALUE_TO_SEND;        // holds data to be sent to target
        long bufferstate;               // holds the state of the host's write buffer

        // initialize COM
        ::CoInitialize( NULL );

        // instantiate the RTDX COM Object
        hr = rtdx.CreateInstance( L"RTDX" );

        cout.setf( ios::showbase );

        if ( FAILED(hr) ) {
                cerr << hex << hr << " - Error: Instantiation failed! \n";
                return -1;
        }

        // open a channel (ichan) for writing
        status = rtdx->Open( "ichan", "W" );

        if ( status != Success ) {
                cerr << hex << status \
                     << " -  Error: Opening of channel \"ichan\" failed! \n";
                return -1;
        }

        // send a 32-bit integer to the target
        rtdx->WriteI4( data, &bufferstate );

        if ( status != Success ) {
                cerr << hex << status << " - Error: WriteI4 failed!\n";
                return -1;
        }

        cout << "Value " << data << " was sent to the target!\n";

        // close the channel
        status = rtdx->Close();

        // release the RTDX COM Object
        rtdx.Release();

        // unitialize COM
        ::CoUninitialize();

        return 0;
}