[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:

1. Is there an alternative to __uuidof() to get the IID of the object?
2. 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]

HI

[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);
}