我正在尝试实施IUnknown。我按照发球台的说明进行操作，但不起作用。当我尝试编译时，我得到：
Error 2 error C2695: 'testInterfaceImplementation::AddRef': overriding virtual function differs from 'IUnknown::AddRef' only by calling convention c:\users\seanm\desktop\test\test\source.cpp 6 1 test
Error 3 error C2695: 'testInterfaceImplementation::QueryInterface': overriding virtual function differs from 'IUnknown::QueryInterface' only by calling convention c:\users\seanm\desktop\test\test\source.cpp 14 1 test
Error 4 error C2695: 'testInterfaceImplementation::Release': overriding virtual function differs from 'IUnknown::Release' only by calling convention c:\users\seanm\desktop\test\test\source.cpp 22 1 test
从这段代码：
#include <Windows.h>
#include <tchar.h>
class testInterfaceImplementation : public IUnknown {
protected:
ULONG AddRef()
{
MessageBox(NULL,
_T("TEST1"),
_T("TEST1"),
NULL);
return 0;
}
HRESULT QueryInterface(IN REFIID riid, OUT void **ppvObject)
{
MessageBox(NULL,
_T("TEST2"),
_T("TEST2"),
NULL);
return S_OK;
}
ULONG Release() {
MessageBox(NULL,
_T("TEST3"),
_T("TEST3"),
NULL);
return 0;
}
};
Add STDMETHODCALLTYPE对于每种方法。
ULONG STDMETHODCALLTYPE AddRef()
HRESULT STDMETHODCALLTYPE QueryInterface(IN REFIID riid, OUT void **ppvObject)
ULONG STDMETHODCALLTYPE Release()
基类（IUnknown) 方法声明为STDMETHODCALLTYPE（这是一个宏__stdcall）。当您重写虚拟方法时，它必须具有与原始方法相同的调用约定，在本例中是__stdcall
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