[Solved] COM interface to CANoe

la-ga

Hello,

I try to program a COM interface to the COM-Server from CANoe. So the Qt project works as Client.

Here is my code so far:

3com_interface.pro
@

Add more folders to ship with the application, here

folder_01.source = qml/3com_interface
folder_01.target = qml
DEPLOYMENTFOLDERS = folder_01

Additional import path used to resolve QML modules in Creator's code model

QML_IMPORT_PATH =

If your application uses the Qt Mobility libraries, uncomment the following

lines and add the respective components to the MOBILITY variable.

CONFIG += mobility

MOBILITY +=

The .cpp file which was generated for your project. Feel free to hack it.

SOURCES += main.cpp
interface.cpp

Installation path

target.path =

Please do not modify the following two lines. Required for deployment.

include(qtquick2applicationviewer/qtquick2applicationviewer.pri)
qtcAddDeployment()

HEADERS +=
CANoe.h
interface.h

CONFIG += qaxcontainer
@

interface.cpp
@
#include "interface.h"
#include <QDebug>
#include "objbase.h"
#include "CANoe.h"

#include "windows.h"
#include "winnls.h"
#include "shobjidl.h"
#include "objidl.h"
#include "shlguid.h"

#include "strsafe.h"

Interface::Interface(QObject *parent) :
QObject(parent)
{
}

void Interface::trigger_slot(const QString &msg)
{

IApplication* pIApp;
HRESULT result;

result = CoInitialize(NULL);

CLSID clsid;
result = CLSIDFromProgID(L"CANoe.Application", &clsid);

if(SUCCEEDED(result))
{
    qDebug() << "CLSID saved";
}

const IID IID_IApplication = __uuidof(IApplication);

result = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, IID_IApplication, (void**) &pIApp);

if(SUCCEEDED(result))
{
    qDebug() << "Connection established";
}

}
@

I get the following error:
undefined reference to '_GUID const&_mingw_uuidof<IApplication>()' (line 37)

I think the compiler has problems with the __uuidof operator. Are there other ways to get the IID of the CANoe COM interface?

Or does someone have any experience or hints how to get access to a COM interface in Qt? I searched for hours in the Internet but doesn't find an example for Qt.
Only some examples for Visual Studio with ATL. But I can't use ATL in Qt. Or are there any possibilities to use it in Qt?

Thank you very much for all answers!

NicuPopescu

according to "__uuidof Operator":http://msdn.microsoft.com/en-us/library/zaah6a61.aspx you should compile with ole32.lib

NicuPopescu

you can use something like:

@canoeAxObj = new QAxObject("CANoe.Application");
CANoe::IApplication canoeapp = (CANoe::IApplication)canoeAxObj->querySubObject("Application");
canoeapp->SetVisible(false);@

where CANoe::IApplication comes from a header file generated with "dumpcpp tool":http://qt-project.org/doc/qt-5.1/activeqt/activeqt-dumpcpp.html with .tlb libid (from registry):

i.e.

D:\Qt\Qt5.1.1-MSVC2010\5.1.1\msvc2010_opengl\bin>dumpcpp input {7F31DEB0-5BCC-11
d3-8562-00105A3E017B}

this will generate a qt canoe.h (warning: different of canoe.h from CANoe installation), which you should add to your project; then with the code above is straight forward

la-ga

Hello NicuPopescu,

thank you for your answer. I've searched in the dcomcnfg after the IID of the CANoe interface.
So I deleted line 37 of my code (see above) and added the following code:

@
IID IID_IApplication = {0x7F31DEB2-0x11d3-0x8562-0x00105A3E017B}
@

I think the result will be the same as your suggestion with the new header file?

However I can start the program and CANoe starts automatically. So I think there is successfully a connection between CANoe and my Qt program.
But in line 41 I have an if query whether the connection was successful. Unfortunately the program doesn't print "Connection established"

Why is an error saved in HRESULT result? Does anybody has an idea?

NicuPopescu

bq. So I deleted line 37 of my code (see above) and added the following code:
IID IID_IApplication = {0x7F31DEB2-0x11d3-0x8562-0x00105A3E017B}

this is not safe, your app will not work with other CANoe package/version ... why not to link against ole32.lib abd use __uuidof()?

check for possible CoCreateInstance() results as described in msdn ... loading CANoe application does not neccessarely mean you have got a pointer to its COM interface! I only can guess that pIApp is NULL, so no COM connection yet ...

la-ga

How can I link to ole32.lib in Qt? I doesn't find it on my PC. Only the ole32.dll....

What do you mean with the possible CoCreateInstance() results? Do you mean the error code saved in HRESULT result?

NicuPopescu

bq. How can I link to ole32.lib in Qt? I doesn’t find it on my PC. Only the ole32.dll….

i.e. here is in C:\Program Files\Microsoft SDKs\Windows\v7.0A\Lib\
better to copy it locally to your project in a "lib" folder and have in .pro file

@LIBS += ../lib/ole32.lib@

bq. What do you mean with the possible CoCreateInstance() results? Do you mean the error code saved in HRESULT result?

yes

L.E. I checked your initial code and it works ...

la-ga

[quote author="NicuPopescu" date="1386863709"]i.e. here is in C:\Program Files\Microsoft SDKs\Windows\v7.0A\Lib\ better to copy it locally to your project in a "lib" folder and have in .pro file [/quote]

I tried to add the library to my project:

I copied the Ole32.Lib out of the Microsoft SDK folder to my project directory
Then I added the following code to my pro file:

@
LIBS += C:/QtProject/3com_interface/libs/Ole32.Lib
@

But I get actually the same error:

"undefined reference to '_GUID const& __mingw_uuidof<IApplication>()'

Do I need some files more, for example the Ole32.dll?

But I'm wondering that my code works correctly in your project. Could you post your code or your project so I can search for the differences?

la-ga

Any ideas?

I have still the same problem: How can I get the IID of a COM-Application to create the COM interface?

There are two possibilities:

Is there an alternative to __uuidof() to get the IID of the object?
What do I need to add to my project, so I can use __uuidof() and how can I add this?

Thank you for all answers so far!

NicuPopescu

bq. Do I need some files more, for example the Ole32.dll?

dll will be found in system32, so no worry

I don't know why it is so difficult for you to get the project compiled; just in case I paste exactly what I have in main window project:

.pro file:

@#-------------------------------------------------

Project created by QtCreator 2013-12-13T16:39:39

#-------------------------------------------------

QT += core gui

greaterThan(QT_MAJOR_VERSION, 4): QT += widgets

TARGET = TestCANoeCOM
TEMPLATE = app

SOURCES += main.cpp
mainwindow.cpp

HEADERS += mainwindow.h

FORMS += mainwindow.ui

LIBS += ../TestCANoeCOM/lib/ole32.lib@

path in LIBS depends on your projetc build directory in QtCreator's Projects panel

in mainwindow.cpp

@#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QDebug>

#include "C:\Program Files\Vector CANoe 7.5\Exec32\COMdev\canoe.h"

MainWindow::MainWindow(QWidget *parent) :
QMainWindow(parent),
ui(new Ui::MainWindow)
{
ui->setupUi(this);

IApplication* pIApp;
HRESULT result;

result = CoInitialize(NULL);

CLSID clsid;
result = CLSIDFromProgID(L"CANoe.Application", &clsid);

if(SUCCEEDED(result))
{
    qDebug() << "CLSID saved";
}

const IID IID_IApplication = __uuidof(IApplication);

result = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, IID_IApplication, (void**) &pIApp);

if(SUCCEEDED(result))
{
    qDebug() << "Connection established";
}

}

MainWindow::~MainWindow()
{
delete ui;
}
@

nothing different to your first code ...

bq. How can I get the IID of a COM-Application to create the COM interface?

in registry HKEY_CLASSES_ROOT->PID (i.e CANoe.Application)->CLSID(Value)

and in HKEY_CLASSES_ROOT->CLSID->Value(found above)->InprocServer32 , you can find more info on COM server registration like:
LocalServer32=path to exe, ocx, dll into which your COM implementation resides

hope it helps! :)

la-ga

Hello NicuPopescu,

I've found my mistake. Thank you for posting your code. You've helped me a lot!

NicuPopescu

you're welcome! :)

hope the answers help other fellows here ...

haythem

HI

haythem

This post is deleted!

hichem

I want to call a function from QT application in facet this function exist a CAPL script runing in Canalyzer I am using COM to get access to the function here my exemple but it doesnt work where is the problem any help plz

this my code:

ICAPL *pcapl;

ICAPLFunction *fn ;
 IApplication* pIApp;


HRESULT result,result1,result2, hresult,result3,result4,hr;
 IDispatch*CaplDisp,*CaplFn;
WCHAR * szMember = L"Multiply";
 DISPID dispid;
  DISPPARAMS dispparams = {NULL, NULL, 0, 0};
    EXCEPINFO excepinfo;
      UINT nArgErr;
   CLSID clsid;



 result = CLSIDFromProgID(L"CANalyzer.Application", &clsid);
   const  IID IID_CAPL =__uuidof(ICAPL);

    const  IID IID_CAPLFUNCTION =__uuidof(ICAPLFunction);
     const IID IID_IApplication =__uuidof(IApplication);

   result = CoCreateInstance(clsid, NULL, CLSCTX_LOCAL_SERVER, IID_IApplication, (void**) &pIApp);


   result1=pIApp->get_CAPL(&CaplDisp);

               qDebug() << "Result_get_CAPL "<<result1 ;


   result2=CaplDisp->QueryInterface(IID_CAPL,(void**)&pcapl);
    qDebug() << "result2 "<<result2 ;


  VARIANT varResult;


  hr = CaplDisp->GetIDsOfNames(IID_CAPLFUNCTION, &szMember, 1, CLSCTX_LOCAL_SERVER, &dispid);
    qDebug() << "hr"<<hr ;
    if (SUCCEEDED(hr)) {
hr = CaplDisp->Invoke(1,IID_CAPL, CLSCTX_LOCAL_SERVER,DISPATCH_METHOD,&dispparams, &varResult, NULL, NULL);
    }

Anis07

@la-ga
hi can you tell us what was the problem ?