Sending a message to a Telegram bot

[jenya7]

First I check my bot is alive and kicking

https://api.telegram.org/bot_my_api_key/sendMessage?chat_id=my_chat_id&text="This is a test"

And my bot gets the message.

Now I use QtTelegramBot library

bot = new Telegram::Bot("my_api_key"); 
bot->sendMessage("my_chat_id", "This is a test"); 

And I get in Debug window - [99] TLS initialization failed

What could be wrong?

[jsulm]

@jenya7 Probably OpenSSL libs are missing. See https://forum.qt.io/topic/95700/qsslsocket-tls-initialization-failed

[jenya7]

@jsulm
I see. I have sslserver.c, sslserver.h in the library.
When break at bot->sendMessage and go deep down I get to

QByteArray Networking::request(QString endpoint, ParameterList params, Networking::Method method)
{
    if (endpoint.isEmpty()) {
        qWarning("Cannot do request without endpoint");
        return QByteArray();
    }
    if (m_token.isEmpty()) {
        qWarning("Cannot do request without a Telegram Bot Token");
        return QByteArray();
    }

    QNetworkRequest req;
    QUrl url = buildUrl(endpoint);
    req.setUrl(url);

#ifdef DEBUG
    qDebug("HTTP request: %s", qUtf8Printable(req.url().toString()));
#endif

    QEventLoop loop;

    QNetworkReply *reply;

    if (method == GET) {
        url.setQuery(parameterListToString(params));
        req.setUrl(url);
        reply = m_nam->get(req);
    } else if (method == POST) {
        req.setHeader(QNetworkRequest::ContentTypeHeader, "application/x-www-form-urlencoded");
        reply = m_nam->post(req, parameterListToString(params));
    } else if (method == UPLOAD) {
        QByteArray boundary = generateMultipartBoundary(params);
        req.setHeader(QNetworkRequest::ContentTypeHeader, "multipart/form-data; boundary=" + boundary);
        QByteArray requestData = generateMultipartFormData(params, boundary);
        req.setHeader(QNetworkRequest::ContentLengthHeader, requestData.length());
        reply = m_nam->post(req, requestData);
    } else {
        qCritical("No valid method!");
        reply = nullptr;
    }

    if (reply == nullptr) {
        qWarning("Reply is NULL");
        delete reply;
        return QByteArray();
    }

    QObject::connect(reply, &QNetworkReply::finished, &loop, &QEventLoop::quit);
    loop.exec();

    if (reply->error() != QNetworkReply::NoError) {
        qCritical("%s", qPrintable(QString("[%1] %2").arg(reply->error()).arg(reply->errorString())));
        delete reply;
        return QByteArray();
    }

    QByteArray ret = reply->readAll();
    delete reply;
    return ret;
}

QUrl Networking::buildUrl(QString endpoint)
{
    QUrl url = QUrl();
    url.setScheme("https");
    url.setHost(API_HOST);
    url.setPath("/bot" + m_token + endpoint);

    return url;
}

And get the error at

 if (reply->error() != QNetworkReply::NoError) {
        qCritical("%s", qPrintable(QString("[%1] %2").arg(reply->error()).arg(reply->errorString())));
        delete reply;
        return QByteArray();
    }

But the function builds an URL and sends with POST method - the same way I do it manually.

[jsulm]

@jenya7 said in Sending a message to a Telegram bot:

I have sslserver.c, sslserver.h in the library

You still need the OpenSSL libs...

[jenya7]

@jsulm said in Sending a message to a Telegram bot:

@jenya7 said in Sending a message to a Telegram bot:

I have sslserver.c, sslserver.h in the library

You still need the OpenSSL libs...

Where can I find it?
I was suggested to add

LIBS += "C:/Qt/Tools/OpenSSL/Win_x64/lib/libssl.lib"

But there is no OpenSSL folder in my Qt/Tools.

[jsulm]

@jenya7 Start the Qt Maintenance Tool and select OpenSSL there, install...

[jenya7]

@jsulm said in Sending a message to a Telegram bot:

@jenya7 Start the Qt Maintenance Tool and select OpenSSL there, install...

When I get to Setup - Qt stage I get
There is an important update available, please run the udater first

How do I run the updater?

[jsulm]

@jenya7 said in Sending a message to a Telegram bot:

How do I run the updater?

What about clicking on "Update components" and then "Next"?

[jenya7]

@jsulm said in Sending a message to a Telegram bot:

@jenya7 said in Sending a message to a Telegram bot:

How do I run the updater?

What about clicking on "Update components" and then "Next"?

Thank you. Now it's OK, OpenSSL installed, added LIBS += C:/Qt/Tools/OpenSSL/Win_x64/lib/libssl.lib
But still the same problem - [99] TLS initialization failed

well...in a Linux project I don't have this problem. probably openssl installed and handled properly in Linux.

But when I run the code

TelegramBot bot("my_api_key");
bot.sendMessage("my_chat_id", "This is a test");

I get in Debug window

QUrl("https://api.telegram.org/botmy_api_key/sendMessage?chat_id=my_chat_id&text=This is a test")
And nothing happens - my bot did not get the message.

well...I've managed to send and get a message on Linux. actually it's good enough, my project should run on Linux.

[SGaist]

Hi,

I would guess that your application cannot find the dlls at run time. You need to add the path to these to the PATH environment variable. Do that in the Run part of the Project panel.

[jenya7]

@SGaist said in Sending a message to a Telegram bot:

Hi,

I would guess that your application cannot find the dlls at run time. You need to add the path to these to the PATH environment variable. Do that in the Run part of the Project panel.

I did so

still the same problem - [99] TLS initialization failed

[jsulm]

@jenya7 You need to add the path to the FOLDER containing the libs without the file name!

[jenya7]

@jsulm said in Sending a message to a Telegram bot:

@jenya7 You need to add the path to the FOLDER containing the libs without the file name!

OK. Did so. Removed the name. Still the same problem.

[jsulm]

@jenya7 Does that folder also contain the dll file?

[jenya7]

@jsulm said in Sending a message to a Telegram bot:

@jenya7 Does that folder also contain the dll file?

I ran a search in Qt folder on any ssl related files and found only
ssleay32.dll in C:\Qt\Tools\mingw730_64\opt\bin and C:\Qt\Tools\QtCreator\bin
Should I include the paths too?

[jenya7]

I have a problem.
This way it works - if I initialize explicitly with a string

telebot::telebot(QObject *parent) : QObject(parent)
{
       TelegramBot bot("my_api_key");
       QObject::connect(&bot, &TelegramBot::newMessage, this, &telebot::NewMessage);
}

But if I do it with variable

telebot::telebot(QObject *parent) : QObject(parent)
{
   if (!sys_params.bot_api_key.isNull() && !sys_params.bot_api_key.isEmpty())
   {
       TelegramBot bot(sys_params.bot_api_key);
       QObject::connect(&bot, &TelegramBot::newMessage, this, &telebot::NewMessage);
   }
}

I get the error
The inferior stopped because it received a signal from the operating system.
Signal name : SIGSEGV
Signal meaning : Segmentation fault

I see the constructor works before sys_params initialization although I set first line after window activation

int main(int argc, char *argv[])
{
    QFuture<uint32_t> discovered;

    QApplication a(argc, argv);

    MainWindow w;
    w.show();

    //here is sys_params initialization 
    SetupRun();
   
    //some other code

      return a.exec();
}

What should I do?

[JonB]

@jenya7 said in Sending a message to a Telegram bot:

Signal name : SIGSEGV

What should I do?

You are supposed to run your code in a debugger. It will stop on the seg fault, go to the stack trace window to see information about where this is occurring from your code/the code you call.

Since we have no idea what your sys_params.bot_api_key is or what is in it, and since you say introducing it causes a seg fault, that would be my first suspect.....

telebot::telebot(QObject *parent) : QObject(parent)
{
       TelegramBot bot("my_api_key");
       QObject::connect(&bot, &TelegramBot::newMessage, this, &telebot::NewMessage);
}

Your TelegramBot bot is a local variable, it will go out of scope and be destroyed at the end of this constructor. Same applies in your second code attempt. What do you think you are achieving with this code, because it is not right.

[jenya7]

@JonB said in Sending a message to a Telegram bot:

@jenya7 said in Sending a message to a Telegram bot:

Signal name : SIGSEGV

What should I do?

You are supposed to run your code in a debugger. It will stop on the seg fault, go to the stack trace window to see information about where this is occurring from your code/the code you call.

Since we have no idea what your sys_params.bot_api_key is or what is in it, and since you say introducing it causes a seg fault, that would be my first suspect.....

telebot::telebot(QObject *parent) : QObject(parent)
{
       TelegramBot bot("my_api_key");
       QObject::connect(&bot, &TelegramBot::newMessage, this, &telebot::NewMessage);
}

Your TelegramBot bot is a local variable, it will go out of scope and be destroyed at the end of this constructor. Same applies in your second code attempt. What do you think you are achieving with this code, because it is not right.

Yes I stop with a breakpoint at
if (!sys_params.bot_api_key.isNull() && !sys_params.bot_api_key.isEmpty())
the next step - refering to sys_params.bot_api_key generates the error.

It's a field of a structure

typedef struct
{
   //some fields
    QString bot_api_key;
}SYS_PARAMS;

SYS_PARAMS sys_params;

How can I do it global? It's not like I can instantiate it

TelegramBot bot;  
 telebot::telebot(QObject *parent) : QObject(parent) 
{
     bot = new TelegramBot ("my_api_key");  //is not allowed
}

[jsulm]

@jenya7 said in Sending a message to a Telegram bot:

the next step - refering to sys_params.bot_api_key generates the error

As @JonB asked: how does the stack trace look like after crash?

"How can I do it global?" - why should it be global? Simply make bot a class member...

[JonB]

@jenya7
As @jsulm has just written for the seg fault.

TelegramBot bot;  
     bot = new TelegramBot ("my_api_key");  //is not allowed

Why do you think this is "not allowed"? What does the compiler error message tell you, I would guess it's pretty clear?