OpenStreetMaps with QtWidgets/C++

MuratUrsavas

Hi,

I'm trying to implement a simple way to get position information via visual maps from OpenStreetMaps. Extensive search has shown me that it is not possible to do it with QtWidgets and C++. Every example I've found shows the way as QML and osm plugin. And also this page says that it is not possible to use C++ as of now.

Is this correct?

If so, is it possible to insert a QML page (or widget?) into a Qt Widgets application? Or do I have to convert the project to QML somehow?

Thanks in advance. Any help is highly appreciated.

SGaist

Hi,

QQuickWidget comes to mind from your description.

Hope it helps

MuratUrsavas

Thank you SGaist,

I guess this would be the easiest way to do it. I'd have to write some QML code after a while.

MuratUrsavas

Hi,

I've applied a simple example into my project and can see the QQuickWidget inside of my QDialog window. But somehow the tiles are not loaded properly. I'm getting errors like these;

qt.network.ssl: QSslSocket: cannot resolve CRYPTO_num_locks
qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_id_callback
qt.network.ssl: QSslSocket: cannot resolve CRYPTO_set_locking_callback
qt.network.ssl: QSslSocket: cannot resolve ERR_free_strings
qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_cleanup
qt.network.ssl: QSslSocket: cannot resolve EVP_CIPHER_CTX_init
qt.network.ssl: QSslSocket: cannot resolve sk_new_null
qt.network.ssl: QSslSocket: cannot resolve sk_push
...

Clearly the TLS handshake is not working at all.

I can build and run minimal_map example and able to see the tiles. So it should be something with my project settings or something like that.

Could it be the QtQuickWidget?

Regards,

SGaist

It doesn't find the OpenSSL version matching the one used when building Qt. A v1.1 VS v1.0 classic issue. Which version of Qt are you using ?
On what platform ?

MuratUrsavas

I'm using 5.12 on Ubuntu 18.10. And after switching to 5.12 in the QML file everything started to work normal. I guess, like you said, the project configuration and qml imports were not matching. Thanks for helping me out.

Now I'll have to find how I could switch to "cycle" map, download offline tiles and use them and control the map view via C++.