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What is an undefined reference/unresolved external symbol error and how do I fix it?
我正在尝试制作不使用 CX 扩展的 WinRT 库。我需要获取包名、漫游数据文件夹等。我写了一些包装器，但是当我将这个库链接到可执行项目时，出现链接器错误
error LNK2019: unresolved external symbol _WindowsCreateStringReference@16 referenced in function "private: void __thiscall Microsoft::WRL::Wrappers::HStringReference::CreateReference(wchar_t const *,unsigned int,unsigned int)" (?CreateReference@HStringReference@Wrappers@WRL@Microsoft@@AAEXPB_WII@Z)
error LNK2019: unresolved external symbol _WindowsDeleteString@4 referenced in function "public: __thiscall Microsoft::WRL::Wrappers::HStringReference::~HStringReference(void)" (??1HStringReference@Wrappers@WRL@Microsoft@@QAE@XZ)
error LNK2019: unresolved external symbol _WindowsGetStringRawBuffer@8 referenced in function "long __cdecl aponialib::winrt::GetFullName(class std::basic_string<wchar_t,struct std::char_traits<wchar_t>,class std::allocator<wchar_t> > &)" (?GetFullName@winrt@aponialib@@YAJAAV?$basic_string@_WU?$char_traits@_W@std@@V?$allocator@_W@2@@std@@@Z)
error LNK2019: unresolved external symbol __imp__RoGetActivationFactory@12 referenced in function "long __cdecl Windows::Foundation::GetActivationFactory<struct ABI::Windows::Storage::IApplicationDataStatics>(struct HSTRING__ *,struct ABI::Windows::Storage::IApplicationDataStatics * *)" (??$GetActivationFactory@UIApplicationDataStatics@Storage@Windows@ABI@@@Foundation@Windows@@YAJPAUHSTRING__@@PAPAUIApplicationDataStatics@Storage@1ABI@@@Z)
这是包名包装器
// including in .h
#include <windows.h>
#include <string>
#include <Strsafe.h>
#include <Winstring.h>
#include <windows.storage.h>
#include <Windows.ApplicationModel.h>
#include <windows.Foundation.h>
#include <wrl/client.h>
#include <wrl/wrappers/corewrappers.h>
//...
HRESULT GetFullName(std::wstring &fullName)
{
HRESULT hr;
Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackageStatics> packageStatics;
hr = Windows::Foundation::GetActivationFactory(Microsoft::WRL::Wrappers::HStringReference(RuntimeClass_Windows_ApplicationModel_Package).Get(), &packageStatics);
if (FAILED(hr))
return hr;
Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackage> package;
hr = packageStatics->get_Current(&package);
if (FAILED(hr))
return hr;
Microsoft::WRL::ComPtr<ABI::Windows::ApplicationModel::IPackageId> packageId;
hr = package->get_Id(&packageId);
if (FAILED(hr))
return hr;
HSTRING name;
hr = packageId->get_FullName(&name);
if (FAILED(hr))
return hr;
UINT32 length;
PCWSTR value = WindowsGetStringRawBuffer(name, &length);
fullName = value;
WindowsDeleteString(name);
return S_OK;
}
也许我没有得到 WRL，我用错了。
谢谢你的帮助:) 托马斯