invokeMethod is messing up signatures

ocgltd

I am running into a strange runtime error when trying to invoke a method. I invoke the method as follows:

QMetaObject::invokeMethod(
                        classPtr,
                        methodName,
                        Qt::QueuedConnection,
                        Q_ARG(ClassA_Types::enumD, ClassA_Types::enumD1), 
                        Q_ARG(ClassA_Types::enumE, ClassA_Types::enumE1),                
                        Q_ARG(ClassB, sMessagePtr->getter()),                                                        
                        Q_ARG(ClassB, rMessagePtr->getter()),                                                        
                        Q_ARG(ClassA_Types::MyStruct, sinfo),                                     
                        Q_ARG(ClassA_Types::MyStruct, sinfo)                                      
                        );

but at run time the signature does not match candidate! When I compile and run under Qt 5.15.12 I get this error:

When I compile and run under Qt 6.5.0 I get this error:

QMetaObject::invokeMethod: No such method MyNameSpace::ClassC::inv_rx_response(ClassA_Types::enumD,ClassB,ClassB)
Candidates are:
                                                                    inv_rx_response(ClassA_Types::enumD,ClassA_Types::enumE,MyNameSpace::ClassB,ClassB,ClassA_Types::MyStruct,ClassA_Types::MyStruct)

(I added spacing into the error message to make it obvious where the namespace appears)

Christian Ehrlicher

Start with a clean build dir and make sure you don't have generated files in your source dir.

Christian Ehrlicher

@ocgltd said in invokeMethod is messing up signatures:

inv_rx_response(ClassA_Types::enumD,ClassB,ClassB)

This does not match your code.

Please provide a minimal, compilable example of your problem.

ocgltd

I've used invokeMethod many times, and I'm sure a minimum example will work fine. I was hoping for some advice on what I might be doing wrong to cause this. I'm pretty sure I've done something silly but just can see it.

And the project way to large to post...

Christian Ehrlicher

Since you did not even show the correct output for the failure case how should we help?

ocgltd

After some experimenting I'm narrow the problem down. Here's where it gets really strange. I placed ALL of my invokation parameters (Q_ARGS) into a single struct, and pass that struct to invokeMethod.

The error still appears, and the candidate function shows the single struct. But, the calling method still shows the old 3 parameters! It's as if the code wasn't compiling properly.

I reset all file permissions in my source tree, cleaned, and qmaked, and recompiled. Still same problem. I assume this is something in the moc file by I have no idea how to fix. Why is invokeMethod still trying to use the old 3 parameters?

Can someone make a suggestion on diagnosing/fixing?

Christian Ehrlicher

Start with a clean build dir and make sure you don't have generated files in your source dir.

ocgltd

That solved it. I'm not sure what happened, but something got messed up my build dir.