Link error when building project using the library

[gbook]

I'm building a very basic Windows application using bit7z, but I'm running into a linker error. I downloaded the latest VC2019 version of bit7z, and I've added it to my project. I'm also building my program using QtCreator, which builds using the VC2019 compiler.

#include "bit7z.hpp"
#include "bitarchivereader.hpp"

main () {
    try {
        bit7z::Bit7zLibrary lib{ "C:/Program Files/7-Zip/7z.dll" };

        // this line gives linker errors
        bit7z::BitArchiveReader archive { lib, "myfile.7z", bit7z::BitFormat::Lzma };

    } catch ( const bit7z::BitException& ex ) { QString err = ex.what(); utils::Print(err); }
}

If I comment out the BitArchiveReader line, it builds just fine. Uncommented, I get the following errors:

bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysAllocString referenced in function "public: __cdecl bit7z::BitPropVariant::BitPropVariant(wchar_t const *)" (??0BitPropVariant@bit7z@@QEAA@PEB_W@Z)
bit7z.lib(opencallback.cpp.obj):-1: error: LNK2001: unresolved external symbol __imp_SysAllocString
bit7z.lib(extractcallback.cpp.obj):-1: error: LNK2001: unresolved external symbol __imp_SysAllocString
bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysAllocStringLen referenced in function "public: __cdecl bit7z::BitPropVariant::BitPropVariant(class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > const &)" (??0BitPropVariant@bit7z@@QEAA@AEBV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z)
bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysFreeString referenced in function "private: void __cdecl bit7z::BitPropVariant::internalClear(void)" (?internalClear@BitPropVariant@bit7z@@AEAAXXZ)
bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysStringLen referenced in function "public: class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > __cdecl bit7z::BitPropVariant::getNativeString(void)const " (?getNativeString@BitPropVariant@bit7z@@QEBA?AV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@XZ)
bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysStringByteLen referenced in function "public: __cdecl bit7z::BitPropVariant::BitPropVariant(struct bit7z::BitPropVariant const &)" (??0BitPropVariant@bit7z@@QEAA@AEBU01@@Z)
bit7z.lib(bitpropvariant.cpp.obj):-1: error: LNK2019: unresolved external symbol __imp_SysAllocStringByteLen referenced in function "public: __cdecl bit7z::BitPropVariant::BitPropVariant(struct bit7z::BitPropVariant const &)" (??0BitPropVariant@bit7z@@QEAA@AEBU01@@Z)
release\squirrel.exe:-1: error: LNK1120: 6 unresolved externals

[gbook]

Solved my own question. In Qt I needed to add the following line to the .pro file:

win32: LIBS += -loleaut32 -lole32