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The drawback of signal/slots ?

Moved Unsolved General and Desktop

23 Posts 6 Posters 6.0k Views 4 Watching

K kshegunov
@VincentLiu @stryga42
```
qRegisterMetaType<Mat>();
qRegisterMetaType<vector<Mat>>();
```
should fix it, provided there's also:
```
Q_DECLARE_METATYPE(Mat)
Q_DECLARE_METATYPE(vector<Mat>)
```
somewhere in the header(s).
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VincentLiu

wrote on last edited by

#21

@kshegunov

Thanks. Actually I did what you displayed, but it works until I use Qt:DirectConnection.
K 1 Reply Last reply

0
V VincentLiu

@kshegunov

Thanks. Actually I did what you displayed, but it works until I use Qt:DirectConnection.
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kshegunov
Moderators
wrote on last edited by

#22
@VincentLiu said in The drawback of signal/slots ?:

Actually I did what you displayed

Not according to the snippet you posted. Bear in mind:
```
qRegisterMetaType<Mat>();
```
and
```
qRegisterMetaType<Mat>("Mat");
```
are different things in principle.
Read and abide by the Qt Code of Conduct
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0
K kshegunov
@VincentLiu said in The drawback of signal/slots ?:

Actually I did what you displayed

Not according to the snippet you posted. Bear in mind:
```
qRegisterMetaType<Mat>();
```
and
```
qRegisterMetaType<Mat>("Mat");
```
are different things in principle.
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V Offline
VincentLiu

wrote on last edited by

#23

@kshegunov Really !!! Thanks, I'll try it
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