本文介绍了IAsyncOperation BitmapImage ^ C ++的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我试图在c＃windows store app项目中创建一个C ++ Runtime组件;
我创建了一个新项目C ++ - > Windows应用商店应用 - > Windows运行时组件。
新项目有默认的class1。
这就是我想要做的：
Class1.h：
public ref class Class1 sealed
{
public ：
Class1（）;
Windows :: Foundation :: IAsyncOperation< Windows :: UI :: Xaml :: Media :: Imaging :: BitmapImage ^> ^ StreamToBitmap（Windows :: Storage :: Streams :: IRandomAccessStream ^ fileStream）;
};
}
Class1.cpp：
Class1 :: Class1（）
{
}
IAsyncOperation< BitmapImage ^> ^ StreamToBitmap（IRandomAccessStream ^ fileStream ）
{
return create_async（[=]（）
{
auto bitmapImage = ref new BitmapImage（）;
bitmapImage-> SetSource（fileStream）;
return bitmapImage;
}）;
}
错误：
错误2错误LNK2019：未解析的外部符号public：virtual struct Windows :: Foundation :: IAsyncOperation< class Windows :: UI :: Xaml :: Media :: Imaging :: BitmapImage ^> ^ __cdecl TestRuntimeC__toCS :: Class1 :: [TestRuntimeC__toCS :: __ IClass1PublicNonVirtuals] :: LoadImage（struct Windows :: Storage :: Streams :: IRandomAccessStream ^）（？LoadImage @？Q__IClass1PublicNonVirtuals @ TestRuntimeC__toCS @@ Class1 @ 2 @ U $ AAAP $ AAU ？$ IAsyncOperation @ P $ AAVBitmapImage @ Imaging @ Media @ Xaml @ UI @Windows @@@ @@ @ P @ AAUIRandomAccessStream @ Streams @ Storage @ 6 @@ Z）在函数public：virtual long __stdcall TestRuntimeC__toCS ::中引用Class1 :: [TestRuntimeC__toCS :: __ IClass1PublicNonVirtuals] :: __ abi_TestRuntimeC__toCS ___ IClass1PublicNonVirtuals ____ abi_LoadImage（struct Windows :: Storage :: Streams :: IRandomAccessStream ^，struct Windows :: Foundation :: IAsyncOperation< class Windows :: UI :: Xaml :: Media :: Imaging： ：BitmapImage ^> ^ *）（？__ abi_TestRuntimeC__toCS ___ IClass1PublicNonVirtuals ____ abi_LoadImage @？Q__IClass1PublicNonVirtuals @ TestRuntimeC__toCS @@ Class1 @ 2 @ U $ AAGJP $ AAUIRandomAccessStream @ Streams @ Storage @Windows @@ PAP $ AAU？$ IAsyncOperation @ P $ AAVBitmapImage @ Imaging @ Media @ Xaml @ UI @ Windows @@@ Foundation @ 7 @@ Z）C：\ Users\Stamatis \Documents\Visual Studio 2013 \Projects\TestRuntimeC ++ toCS\TestRuntimeC ++ toCS\Class1.obj TestRuntimeC ++ toCS
解决方案
Im trying to create a C++ Runtime compoment to use in c# windows store app project;
I Created a new project C++ -> Windows Store App -> Windows Runtime Component.
The new project has default class1.
This is what i m trying to do:
Class1.h:
public ref class Class1 sealed { public: Class1(); Windows::Foundation::IAsyncOperation<Windows::UI::Xaml::Media::Imaging::BitmapImage^>^ StreamToBitmap(Windows::Storage::Streams::IRandomAccessStream^ fileStream); }; }
Class1.cpp:
Class1::Class1()
{
}
IAsyncOperation<BitmapImage^>^ StreamToBitmap(IRandomAccessStream^ fileStream)
{
return create_async([=]()
{
auto bitmapImage = ref new BitmapImage();
bitmapImage->SetSource(fileStream);
return bitmapImage;
});
}
Errors:
Error 2 error LNK2019: unresolved external symbol "public: virtual struct Windows::Foundation::IAsyncOperation<class Windows::UI::Xaml::Media::Imaging::BitmapImage ^> ^ __cdecl TestRuntimeC__toCS::Class1::[TestRuntimeC__toCS::__IClass1PublicNonVirtuals]::LoadImage(struct Windows::Storage::Streams::IRandomAccessStream ^)" (?LoadImage@?Q__IClass1PublicNonVirtuals@TestRuntimeC__toCS@@Class1@2@U$AAAP$AAU?$IAsyncOperation@P$AAVBitmapImage@Imaging@Media@Xaml@UI@Windows@@@Foundation@Windows@@P$AAUIRandomAccessStream@Streams@Storage@6@@Z) referenced in function "public: virtual long __stdcall TestRuntimeC__toCS::Class1::[TestRuntimeC__toCS::__IClass1PublicNonVirtuals]::__abi_TestRuntimeC__toCS___IClass1PublicNonVirtuals____abi_LoadImage(struct Windows::Storage::Streams::IRandomAccessStream ^,struct Windows::Foundation::IAsyncOperation<class Windows::UI::Xaml::Media::Imaging::BitmapImage ^> ^ *)" (?__abi_TestRuntimeC__toCS___IClass1PublicNonVirtuals____abi_LoadImage@?Q__IClass1PublicNonVirtuals@TestRuntimeC__toCS@@Class1@2@U$AAGJP$AAUIRandomAccessStream@Streams@Storage@Windows@@PAP$AAU?$IAsyncOperation@P$AAVBitmapImage@Imaging@Media@Xaml@UI@Windows@@@Foundation@7@@Z) C:\Users\Stamatis\Documents\Visual Studio 2013\Projects\TestRuntimeC++toCS\TestRuntimeC++toCS\Class1.obj TestRuntimeC++toCS
解决方案
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