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