WCHAR to QString giving error in vs2005

[ucomesdag]

When using QString::fromWCharArray(const wchar_t* , int size = - 1);

vs2005 gives the following error:

error LNK2019: unresolved external symbol "__declspec(dllimport) 
public: static class QString __cdecl QString::fromWCharArray(wchar_t const *,int)" 
(__imp_?fromWCharArray@QString@@SA?AV1@PB_WH@Z) referenced in function "public: 
void __thiscall midiIO::queryMidiInDevices(void)" (?queryMidiInDevices@midiIO@@QAEXXZ)

error LNK2019: unresolved external symbol "__declspec(dllimport) 
public: static class QString __cdecl QString::fromWCharArray(wchar_t const *,int)" 
(__imp_?fromWCharArray@QString@@SA?AV1@PB_WH@Z) referenced in function "public: 
void __thiscall midiIO::queryMidiInDevices(void)" (?queryMidiInDevices@midiIO@@QAEXXZ)

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To fix this, go to Project --> Properties --> Configuration Properties -->
C/C++ --> Language, and set 'Treat wchar_t as Built-in Type' to No.

Hope it helps someone, it fixed my day...

[wysota]

Thanks for the info. Maybe you could add it to our wiki as well?

[SteveT]

I am a new Qt user. I am having this same issue on a project that I am currently on. I am linking into my Qt VS2005 project libraries that have the compiled with "Treat wchar_t as Built-in Type" set to "Yes". Third party libraries also appear to have been built this way. My Qt project file therefore sees unresolved externals when I call from the Qt project file into a libary. If, in my Qt project file I set the option to "No(/Zc:wchar_t-)" then my external libraries link just fine but Qt then has issues with the methods called by QString (such as ::fromStdWString() which then cannot link properly).

How do I use Qt with libaries built with "Yes" for "Treat wchar_t as Built-in Type"?

Steve