IAsyncOperation BitmapImage ^ C++

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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:

C++

public ref class Class1 sealed
	{
	public:
		Class1();
                Windows::Foundation::IAsyncOperation<Windows::UI::Xaml::Media::Imaging::BitmapImage^>^ StreamToBitmap(Windows::Storage::Streams::IRandomAccessStream^ fileStream);

	};
}

Class1.cpp:

C++

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

Posted 13-Apr-14 7:02am

Zamanis

Updated 13-Apr-14 7:06am

v3

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Comments

Richard MacCutchan 14-Apr-14 4:22am

The declaration in your header file is not matched by the implementation in your source code. Use proper meaningful class names and ensure that both definitions are the same.

1 solution

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Jason R. Woods · Answer 1 · 2014-07-15T04:01:00

Solution 1

Looks like all you need to do would be to change

C++

IAsyncOperation<BitmapImage^>^ StreamToBitmap(IRandomAccessStream^ fileStream)

to:

C++

IAsyncOperation<BitmapImage^>^ Class1::StreamToBitmap(IRandomAccessStream^ fileStream)

in your Class1.cpp file.

Posted 15-Jul-14 4:01am

Jason R. Woods

Updated 15-Jul-14 4:24am

v2