Why nativeEvent can not receive WM_CHAR message?

[vilas]

Qt version : 5.5.1; Os: window 7
when i press a key, the focus widget only can receive WM_KEYDOWN and WM_KEYUP message in nativeEvent(),
but in mfc app, it will WM_CHAR message also. What can i do if i want to receive WM_CHAR message in qt app?

[SGaist]

Hi,

Why do you need that ? Does Qt's QKeyEvent provide the information you need ?

[vilas]

This post is deleted!

[vilas]

@SGaist Hi,
Because I want to combine qt widget with cef under cef off-screen mode. My project must be compatible with windows xp, so I can not use QWebEngineView. Cef needs MSG struct, but I don't know how to transfer QKeyEvent* to MSG*, so QKeyEvent seems to be useless.

[JonB]

@vilas

but I don't know how to transfer QKeyEvent* to MSG*, so QKeyEvent seems to be useless.

If you're saying that would solve your need, why can you not do that? IIRC a MSG struct has only about 4 fields, are they not equatable to what you can have in a QKeyEvent?

[SGaist]

You'll need a native event filter. But first take a look at this Qt bug report.

[vilas]

@JonB
I find the fields in a MSG struct are not equatable to what I can have in a QKeyEvent.

[JonB]

@vilas
Oh! Why not? If you are saying it would solve your issue if you could populate a MSG from a QKeyEvent, what is it that you cannot successfully copy across?

[vilas]

@SGaist I have install the native event filter, but it also only receive WM_KEYDOWN and WM_KEYUP message in nativeEventFilter(), without WM_CHAR message.

[JonB]

@vilas
How does your situation compare to the Qt bug report @SGaist gave you, which says "no WM_CHAR messages"?

[mrjj]

@vilas
Seems it was fixed in
Qt 5.11.1

[vilas]

@mrjj

After trying, I find that Qt5.11.1 can receive WM_CHAR message in nativeEventFilter() , but can't receive WM_IME_CHAR message.

[vilas]

@JonB said in Why nativeEvent can not receive WM_CHAR message?:

your situation compare to the Qt bug report @SGaist gave you

Yes, my situation is similar to the Qt bug report @SGaist gave.But I also want to support the input method in my project.