The following table lists the values of common HRESULT values. More values are contained in the header file winerror.h.
Name Description Value S_OK
Operation successful
0x00000000
E_UNEXPECTED
Unexpected failure
0x8000FFFF
E_NOTIMPL
Not implemented
0x80004001
E_OUTOFMEMORY
Failed to allocate necessary memory
0x8007000E
E_INVALIDARG
One or more arguments are invalid
0x80070057
E_NOINTERFACE
No such interface supported
0x80004002
E_POINTER
Invalid pointer
0x80004003
E_HANDLE
Invalid handle
0x80070006
E_ABORT
Operation aborted
0x80004004
E_FAIL
UnspecifIEd failure
0x80004005
E_AccessDENIED
General Access denIEd error
0x80070005
S_FALSE
Operation failure
HRESULT 其實是一個雙字節的值，其最高位(bit)如果是0表示成功，1表示錯誤。我們在程序中如果需要判斷返回值，則可以使用比較運算符號；switch開關語句；也可以使用VC提供的宏：
HRESULT hr = 調用組件函數; if( SUCCEEDED( hr ) ){...} // 如果成功 ...... if( FAILED( hr ) ){...} // 如果失敗
