HRESULT 返回值

 

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 其实是一个双字节的值，其最高位(bit)如果是0表示成功，1表示错误。我们在程序中如果需要判断返回值，则可以使用比较运算符号；switch开关语句；也可以使用VC提供的宏：

      HRESULT hr = 调用组件函数;      if( SUCCEEDED( hr ) ){...} // 如果成功      ......      if( FAILED( hr ) ){...} // 如果失败