QAxWidget Programming: pass by reference

[ChrisW67]

I am not certain how a pointer to a float can be passed as the second argument but I would try:

double outPos(0.0);
QVariant retCode = hMotor.dynamicCall("GetPosition(int, float&)",chanID, outPos);

double outPos(0.0);
QVariant retCode = hMotor.dynamicCall("GetPosition(int, float&)",chanID, outPos);

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The parameter types come from the lookup in the docs.

[NeuroC++]

Thanks, I appreciate the help.

I just tried your suggestion. It gives the same error as before.

QAxBase: Error calling IDispatch member GetPosition: Type mismatch in parameter
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[ChrisW67]

How about this?

float outPos(0.0);
QVariant retCode = hMotor.dynamicCall("GetPosition(int, float*)",chanID, &outPos);

float outPos(0.0);
QVariant retCode = hMotor.dynamicCall("GetPosition(int, float*)",chanID, &outPos);

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I don't really expect this to work, just covering the bases.

[NeuroC++]

Yeah, if I do that it gives the "QVariant::QVariant(*void) is private" compile error. I've even tried casting the pointer to "outPos" into an int that I put into a QVariant which I then passed to the function. It compiled but still gave a type mismatch error at runtime.