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MouseClient.cpp

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// MouseClient.cpp: implementation of the MouseClient class.


#include "stdafx.h"
#include "MouseClient.h"

// Construction/Destruction

MouseClient::MouseClient(const TString &name)
:PClient( TString( TEXT("MOUSE") ) + name, false)
{
    semName = TString( TEXT("MOUSESEM") ) + name;
    hasMessage = NULL;
}

MouseClient::~MouseClient()
{
    if(hasMessage != NULL)
        CloseHandle(hasMessage);
}

// Member Functions

DWORD MouseClient::connect()
{   
    DWORD success = PClient::connect();

    if( PC_CONNECTED == success ) {
        hasMessage = OpenSemaphore(SEMAPHORE_ALL_ACCESS, false, semName);
        if( hasMessage == NULL ){
            PClient::disconnect();
            success = PC_FAILED;
        }
    }

    return success;
}

void MouseClient::disconnect()
{
    if(hasMessage != NULL)
        CloseHandle(hasMessage);
    PClient::disconnect();
}

DWORD MouseClient::deQueueMessage(mouseMessage *message)
{
    if( !isConnected() ){
        return MI_NOT_CONNECTED;
    }
    
    DWORD numBytesRead;

    if( message == NULL ) {
        return MI_INVALID_PTR;

    } else if( WAIT_OBJECT_0 == WaitForSingleObject(hasMessage, 0) ) {

        if( ReadFile( 
                hPipe,                  // Read from
                message,                // data buffer
                sizeof(mouseMessage),   // number of bytes to read
                &numBytesRead,          // number of bytes read
                NULL) ) {

            if( numBytesRead != sizeof(mouseMessage) ) {
                return MI_UNKNOWN_ERROR;
            } else {
                return MI_SUCCESS;
            }
        } else if(ERROR_READ_FAULT == GetLastError()) {
            disconnect();
            /* \todo decide what to do (throw exception?) */
        } 
        return MI_UNKNOWN_ERROR;
    } else {
        return MI_NO_MESSAGE;
    }
}

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