windows 我如何（有没有办法）将 HRESULT 转换为系统特定的错误消息？
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How can I (is there a way to) convert an HRESULT into a system specific error message?
提问by Billy ONeal
According to this, there's no way to convert a HRESULT error code into a Win32 error code. Therefore (at least to my understanding), my use of FormatMessage in order to generate error messages (i.e.
根据这个，没有办法到HRESULT错误代码转换为Win32错误代码。因此（至少据我所知），我使用 FormatMessage 来生成错误消息（即
std::wstring Exception::GetWideMessage() const
{
using std::tr1::shared_ptr;
shared_ptr<void> buff;
LPWSTR buffPtr;
DWORD bufferLength = FormatMessageW(
FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
GetErrorCode(),
0,
reinterpret_cast<LPWSTR>(&buffPtr),
0,
NULL);
buff.reset(buffPtr, LocalFreeHelper());
return std::wstring(buffPtr, bufferLength);
}
) does not work for HRESULTs.
) 不适用于 HRESULT。
How do I generate these kinds of system-specific error strings for HRESULTs?
如何为 HRESULT 生成这些类型的特定于系统的错误字符串？
回答by Mordachai
This answer incorporates Raymond Chen's ideas, and correctly discerns the incoming HRESULT, and returns an error string using the correct facility to obtain the error message:
这个答案结合了 Raymond Chen 的想法，并正确识别传入的 HRESULT，并使用正确的工具返回错误字符串以获取错误消息：
/////////////////////////////
// ComException
CString FormatMessage(HRESULT result)
{
CString strMessage;
WORD facility = HRESULT_FACILITY(result);
CComPtr<IErrorInfo> iei;
if (S_OK == GetErrorInfo(0, &iei) && iei)
{
// get the error description from the IErrorInfo
BSTR bstr = NULL;
if (SUCCEEDED(iei->GetDescription(&bstr)))
{
// append the description to our label
strMessage.Append(bstr);
// done with BSTR, do manual cleanup
SysFreeString(bstr);
}
}
else if (facility == FACILITY_ITF)
{
// interface specific - no standard mapping available
strMessage.Append(_T("FACILITY_ITF - This error is interface specific. No further information is available."));
}
else
{
// attempt to treat as a standard, system error, and ask FormatMessage to explain it
CString error;
CErrorMessage::FormatMessage(error, result); // <- This is just a wrapper for ::FormatMessage, left to reader as an exercise :)
if (!error.IsEmpty())
strMessage.Append(error);
}
return strMessage;
}
