Returning a QString to a QLibrary

**johnmauer** · 13th February 2010, 22:35

I am using a shared library and load it using QLibrary. That requires that the functions be exported with extern "C". However, the function

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extern "C" QString objectName(long type);

extern "C" QString objectName(long type);

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gets a compiler warning

'objectName' has C-linkage specified, but returns UDT 'QString' which is incompatible with C

Is there a way to export a QString return from a shared library? I would prefer not defeating a really good class like QString.

**faldzip** · 14th February 2010, 00:06

It is because of 'extern "C"'. Why do you need this extern C? As the error says you can't use QString as it is not compatible with C which is totally right as QString is a class.

**tdt** · 14th February 2010, 08:29

simple: you have to use char* and conversions like QString::toUtf8

**johnmauer** · 14th February 2010, 12:27

Yes, I've used the dual conversion already. I was just hoping that there was a better to export it; QLibrary could have been written to resolve the transformation. Thanks