How to get the content in translateLine by another app?

Hi there,
I was trying to write a small application (running on Windows) to get the word in the control translateLine.
It is easy on if GoldenDict is a traditional Windows app. All you have to do is to send a message to the edit control.
But I am a QT newbie, I really don't know how.
is there a way to communicate with GoldenDict? I mean, app <-> app.
Thanks a lot.
I was trying to write a small application (running on Windows) to get the word in the control translateLine.
It is easy on if GoldenDict is a traditional Windows app. All you have to do is to send a message to the edit control.
But I am a QT newbie, I really don't know how.
is there a way to communicate with GoldenDict? I mean, app <-> app.
Thanks a lot.