Hi Nils,
I have no experience with QT, but here are some thoughts. Filename parameter of Map.AddLayerFromFilename is defined as LPCTSTR. Since we are not using Unicode build it's compiled into LPCSTR (const char*). So I'm not particularly surprised that there are problems when you are trying to pass wide string.
It's also possible to open layers using classes like Shapefile and OgrLayer directly (e.g. Shapefile.Open). Please check this doc for the details. These classes use dual interfaces rather than just IDispatch and string parameters are passed as BSTR which are Unicode and it seems are available in QT.
Hope this helps,
Sergei
I have no experience with QT, but here are some thoughts. Filename parameter of Map.AddLayerFromFilename is defined as LPCTSTR. Since we are not using Unicode build it's compiled into LPCSTR (const char*). So I'm not particularly surprised that there are problems when you are trying to pass wide string.
It's also possible to open layers using classes like Shapefile and OgrLayer directly (e.g. Shapefile.Open). Please check this doc for the details. These classes use dual interfaces rather than just IDispatch and string parameters are passed as BSTR which are Unicode and it seems are available in QT.
Hope this helps,
Sergei