ShowMessage: Show a messagebox

Classes
struct	RI_CShowMessage
	Data structure for the Request "ShowMessage". More...

Functions
LRESULT	RI_ShowMessage_ReadData (LPARAM, RI_CShowMessage &)
	Read data from shared memory for "Show Message".
LRESULT	RI_ShowMessage_WriteData (LPARAM, RI_CShowMessage &)
	Write data to shared memory for "Show Message".

Variables
const UINT	RI_MESSAGE_SHOWMESSAGE = RegisterWindowMessage(TEXT("RI_MESSAGE_SHOWMESSAGE"))

Detailed Description

Variable Documentation

const UINT RI_MESSAGE_SHOWMESSAGE = RegisterWindowMessage(TEXT("RI_MESSAGE_SHOWMESSAGE"))

Message ID for the Request "show message":
RI_MESSAGE_SHOWMESSAGE

Write Memory:

RI_ShowMessage_WriteData(LPARAM id, RI_CShowMessage data );

Read Memory:

RI_ShowMessage_ReadData(LPARAM id, RI_CShowMessage data );

Return Values for ShowMessage:

RI_NOERROR = Message was shown
RI_NODESC = Message not shown, because no message was defined

Description:

Shows a Messagebox with Ok, Ok/Cancel or Yes/No-Button(s). Returns the button pressed from the user (see data-struct for details).

Returns a single package

Example:

#define USE_LOADLIBRARY
#include "TNSRemoteInterfaceDll.h"

LPARAM GetUniqueID()
{
    //generate unique ID
    static LPARAM id = 0;
    if (++id == 0) ++id; // do not use 0 !!!!!
    return id;
}

inline LRESULT RI_MESSAGE( const UINT request, HWND h_client, LPARAM id )
{
    //check if RI handle is valid
    if ( !IsWindow( RI_GetTNS() ) ) 
        return RI_NAVIGATIONNOTACTIVE;
    //send the request
    PostMessage( RI_GetTNS(), request, WPARAM(h_client), id );
    return RI_NOERROR;
}

LRESULT CDlgMFC_ShowMessage::WindowProc ( UINT  message , WPARAM  wParam , LPARAM  lParam )
{
    //check messages for answer from RI
    if ( message == RI_MESSAGE_SHOWMESSAGE )
    {
        if ( (LRESULT)wParam == RI_NOERROR )
        {
            //Message was shown. errorcode (0)
            RI_CShowMessage data;
            //read data from shared memory
            LRESULT read_suc = RI_ShowMessage_ReadData( lParam, data );
            TRACE(TEXT("Feedback:  %i"),data.m_Feedback );
        }
        else if ( (LRESULT)wParam == RI_NODESC )
            //Message was not shown, because no Message defined. errorcode (12)
    }
    return CDialog::WindowProc( message, wParam, lParam );
}

void CDlgMFC_ShowMessage::foo()
{
    // *** copy data to the struct ***
    RI_CShowMessage data;
    wcscpy (data.m_MessageCaption, L"Information");
    wcscpy (data.m_Message, L"You have reached the maximum driving time!");
    data.m_MessageButton = 1;
    // *** write data in the Shared memory***
    LPARAM id = GetUniqueID();
    LRESULT sharing_ret = RI_ShowMessage_WriteData( id, data );
    if ( sharing_ret != RI_NOERROR ) 
        return;
    if ( RI_MESSAGE( RI_MESSAGE_SHOWMESSAGE, GetSafeHwnd(), id ) == RI_NOERROR )
        //message sending succeeded
                return;
    else
        //navigation software not running
                return;
}