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did you build your opencv libs with Qt support ? (else it is not supported at all)

did you build your opencv libs with Qt support ? (else it is not supported at all)

void callback( int state, void*userData) {
        // do something
}

createButton("button6",callback, NULL, CV_PUSH_BUTTON,1);

did you build your opencv libs with Qt support support ? (else it is not supported at all)

the signature of your callback function should be:

void callback( int state, void*userData) {
        // do something
}

then add it to the button:

createButton("button6",callback, NULL, CV_PUSH_BUTTON,1);

did you build your opencv libs with Qt support ? (else it is not supported at all)

the signature of your callback function should be:

void callback( int callback(int state, void*userData) {
     // do something
}

then add it to the button:

createButton("button6",callback, NULL, CV_PUSH_BUTTON,1);