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我想添加一个C++项目到我的c#代码,我试图实现IUnknown接口。我不断收到有关c2259的错误:无法实例化抽象类。错误c2259从IUnknown实现接口类
我试着玩一些东西,比如让这个类变成一个类并改变实现,但似乎没有任何工作。以下是我使用的一些代码。
我的接口类:
interface __declspec(uuid("c78b266d-b2c0-4e9d-863b-e3f74a721d47"))
IClientWrapper : public IUnknown
{
public:
virtual STDMETHODIMP get_CurrentIsReadOnly(bool *pIsReadOnly) = 0;
virtual STDMETHODIMP get_CachedIsReadOnly(bool *pIsReadOnly) = 0;
};
我的处理程序类:
#include "RotateHandler.h"
RotateHandler::RotateHandler()
{
}
RotateHandler::~RotateHandler()
{
}
STDMETHODIMP RotateHandler::CreateClientWrapper(IUIAutomationPatternInstance *pPatternInstance, IUnknown **pClientWrapper)
{
*pClientWrapper = new RotateWrapper(pPatternInstance); //here is error c2259
if (*pClientWrapper == NULL)
return E_INVALIDARG;
return S_OK;
}
STDMETHODIMP RotateHandler::Dispatch(IUnknown *pTarget, UINT index, const struct UIAutomationParameter *pParams, UINT cParams)
{
switch(index)
{
case Rotation_GetIsReadOnly:
return ((ICustomProvider*)pTarget)->get_IsReadOnly((bool*)pParams[0].pData);
}
return E_INVALIDARG;
}
我的包装类:
#include "RotateWrapper.h"
RotateWrapper::RotateWrapper()
{
}
RotateWrapper::RotateWrapper(IUIAutomationPatternInstance *pInstance)
: _pInstance(pInstance)
{
_pInstance->AddRef();
}
RotateWrapper::~RotateWrapper()
{
_pInstance->Release();
}
STDMETHODIMP RotateWrapper::get_CurrentIsReadOnly(bool *pIsReadOnly)
{
return _pInstance->GetProperty(0, false, UIAutomationType_Bool, pIsReadOnly);
}
STDMETHODIMP RotateWrapper::get_CachedIsReadOnly(bool *pIsReadOnly)
{
return _pInstance->GetProperty(0, true, UIAutomationType_Bool, pIsReadOnly);
}
任何帮助表示赞赏。
我的类定义是这样的:
public class RotateWrapper : public IClientWrapper
我看,我没有实现QueryInterface。这可能是问题(我希望...大声笑) –
感谢您的帮助Rob! –