430 lines
13 KiB
C
430 lines
13 KiB
C
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/** \file
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* Provide COM Error support.
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*/
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/*
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* Copyright <EFBFBD> 2000, 2001 Sofus Mortensen
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*
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* This material is provided "as is", with absolutely no warranty
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* expressed or implied. Any use is at your own risk. Permission to
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* use or copy this software for any purpose is hereby granted without
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* fee, provided the above notices are retained on all copies.
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* Permission to modify the code and to distribute modified code is
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* granted, provided the above notices are retained, and a notice that
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* the code was modified is included with the above copyright notice.
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*
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* This header is part of Comet version 2.
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* https://github.com/alamaison/comet
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*/
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#ifndef COMET_ERROR_H
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#define COMET_ERROR_H
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#include <comet/config.h>
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#include <stdexcept>
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#include <string>
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#include <comet/error_fwd.h>
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#include <comet/bstr.h>
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#include <comet/ptr.h>
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#include <comet/uuid_fwd.h>
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#pragma warning(push)
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#pragma warning(disable : 4290)
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namespace comet {
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namespace impl {
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inline com_ptr<IErrorInfo> GetErrorInfo() throw()
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{
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IErrorInfo* ei = 0;
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::GetErrorInfo(0, &ei);
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return com_ptr<IErrorInfo>(auto_attach(ei));
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}
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inline com_ptr<ICreateErrorInfo> CreateErrorInfo() throw()
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{
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ICreateErrorInfo* cei = 0;
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::CreateErrorInfo(&cei);
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return com_ptr<ICreateErrorInfo>(auto_attach(cei));
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}
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template<typename Itf> inline bool supports_ErrorInfo(Itf* p)
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{
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com_ptr<ISupportErrorInfo> q = com_cast(com_ptr<Itf>(p));
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if (q == 0) return false;
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return S_OK == q->InterfaceSupportsErrorInfo(uuidof<Itf>());
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}
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}
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/** \class com_error error.h comet/error.h
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* COM error.
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*/
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class com_error : public std::runtime_error
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{
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public:
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//! Construct com_error from HRESULT.
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/*!
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\param hr
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HRESULT value of error.
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*/
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explicit com_error(HRESULT hr) : hr_(hr), std::runtime_error("")
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{}
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//! Construct com_error from HRESULT and textual description.
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/*!
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\param msg
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Description of error.
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\param hr
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HRESULT value of error.
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*/
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explicit com_error(const bstr_t& msg, HRESULT hr = E_FAIL) : hr_(hr), std::runtime_error("")
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{
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com_ptr<ICreateErrorInfo> cei(impl::CreateErrorInfo());
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if ( !cei.is_null() ) {
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try {
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cei->SetDescription(msg.in());
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ei_ = com_ptr<IErrorInfo>( com_cast(cei)) ;
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} catch (std::bad_alloc&)
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{}
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}
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}
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//! Construct com_error from HRESULT, textual description, source, iid, help.
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/*!
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\param msg Description of error.
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\param hr HRESULT value of error.
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\param src Description of source line
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\param iid Interface the error was on
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\param helpFile Name of help file
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\param helpContext Name of help Context
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*/
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explicit com_error(const bstr_t &msg, HRESULT hr, const bstr_t &src, const uuid_t &iid = uuid_t(),
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const bstr_t &helpFile=bstr_t(), DWORD helpContext = -1)
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: hr_(hr), std::runtime_error("")
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{
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com_ptr<ICreateErrorInfo> cei(impl::CreateErrorInfo());
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if ( ! cei.is_null() )
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{
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try {
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cei->SetDescription(msg.in());
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if (!src.is_null() )
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cei->SetSource( src.in() );
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if (iid != uuid_t())
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cei->SetGUID( iid );
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if (!helpFile.is_null())
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{
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cei->SetHelpFile( helpFile.in() );
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cei->SetHelpContext( helpContext );
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}
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ei_ = com_ptr<IErrorInfo>( com_cast(cei)) ;
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} catch (std::bad_alloc&)
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{}
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}
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}
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/// Construct with an error-info and hresult.
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explicit com_error(HRESULT hr, const com_ptr<IErrorInfo>& ei)
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: hr_(hr), ei_(ei), std::runtime_error("")
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{}
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public:
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//! Return a string with a description of the error
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/*!
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what() uses Description from IErrorInfo if such is present, otherwise FormatMessage is used
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to create a description of the HRESULT error value.
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\retval
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A const char* string with a textual description of the error.
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*/
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const char* what() const throw()
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{
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try {
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if (what_.empty()) {
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what_ = s_str();
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}
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} catch (std::bad_alloc&) {
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return 0;
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}
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return what_.c_str();
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}
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/// Returns a std::string with a description of the error.
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std::string s_str() const
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{
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std::string ret;
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get_str(ret);
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return ret;
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}
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/// Returns a std::wstring with a description of the error.
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std::wstring w_str() const
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{
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std::wstring ret;
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get_str(ret);
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return ret;
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}
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/// Returns a tstring with a description of the error.
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tstring t_str() const
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{
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tstring ret;
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get_str(ret);
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return ret;
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}
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private:
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void get_str(std::string& ret) const
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{
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if (ei_.is_null() == false)
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{
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bstr_t bs;
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if (SUCCEEDED(ei_->GetDescription(bs.out())) && !bs.is_empty())
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{
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ret= bs.s_str();
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return;
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}
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}
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char* lpMsgBuf;
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if (FormatMessageA(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS, NULL, hr_,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
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reinterpret_cast<char*>(&lpMsgBuf), 0, NULL))
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{
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char* lpEnd = lpMsgBuf;
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while (*lpEnd != '\0')
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lpEnd++;
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while (lpEnd > lpMsgBuf && // Trim trailing newlines
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(*(lpEnd - 1) == '\n' || *(lpEnd - 1) == '\r'))
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lpEnd--;
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ret.assign(lpMsgBuf, lpEnd - lpMsgBuf);
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LocalFree(lpMsgBuf);
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}
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}
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void get_str(std::wstring& ret) const
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{
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if (ei_.is_null() == false)
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{
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bstr_t bs;
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if (SUCCEEDED(ei_->GetDescription(bs.out())) && !bs.is_empty())
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{
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ret = bs.w_str();
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return;
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}
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}
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wchar_t* lpMsgBuf;
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if (FormatMessageW(
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FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM |
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FORMAT_MESSAGE_IGNORE_INSERTS, NULL, hr_,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), // Default language
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reinterpret_cast<wchar_t*>(&lpMsgBuf), 0, NULL))
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{
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wchar_t* lpEnd = lpMsgBuf;
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while (*lpEnd != L'\0')
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lpEnd++;
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while (lpEnd > lpMsgBuf && // Trim trailing newlines
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(*(lpEnd - 1) == L'\n' || *(lpEnd - 1) == L'\r'))
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lpEnd--;
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ret.assign(lpMsgBuf, lpEnd - lpMsgBuf);
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LocalFree(lpMsgBuf);
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}
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}
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public:
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/** Return the HRESULT for the error.
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*/
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HRESULT hr() const throw()
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{
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return hr_;
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}
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/// \name wrappers for IErrorInfo
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//@{
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/// Description of the error.
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bstr_t description() const
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{
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bstr_t rv;
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if (!ei_.is_null()) ei_->GetDescription( rv.out() ) | raise_exception;
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return rv;
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}
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/// The error source description.
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bstr_t source() const
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{
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bstr_t rv;
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if (!ei_.is_null()) ei_->GetSource( rv.out() ) | raise_exception;
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return rv;
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}
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/// Interface IID.
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GUID guid() const
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{
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GUID rv;
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if (!ei_.is_null()) ei_->GetGUID( &rv ) | raise_exception;
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else ZeroMemory(&rv, sizeof(rv));
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return rv;
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}
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/// Helpfile name.
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bstr_t help_file() const
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{
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bstr_t rv;
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if (!ei_.is_null()) ei_->GetHelpFile( rv.out() ) | raise_exception;
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return rv;
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}
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/// Help conext.
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DWORD help_context() const
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{
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DWORD rv = 0;
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if (!ei_.is_null()) ei_->GetHelpContext( &rv ) | raise_exception;
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return rv;
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}
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//@}
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/// Return the error-info object.
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com_ptr<IErrorInfo> get_ei() const
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{
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return ei_;
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}
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private:
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mutable std::string what_;
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com_ptr<IErrorInfo> ei_;
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HRESULT hr_;
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};
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namespace impl {
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inline HRESULT return_com_error(HRESULT hr, const bstr_t &desc, const bstr_t &src = auto_attach(BSTR(NULL)),
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const uuid_t &iid=CLSID_NULL, const bstr_t &helpFile=bstr_t(), DWORD helpContext = -1)
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{
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com_ptr<ICreateErrorInfo> cei(impl::CreateErrorInfo());
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if (cei.is_null() == false) {
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try {
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cei->SetDescription(desc.in());
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if (!src.is_null() )
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cei->SetSource( src.in() );
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if (iid != uuid_t())
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cei->SetGUID( iid );
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if (!helpFile.is_null())
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{
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cei->SetHelpFile( helpFile.in() );
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cei->SetHelpContext( helpContext );
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}
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com_ptr<IErrorInfo> ei = com_cast(cei);
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::SetErrorInfo(0, ei.in());
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} catch (std::bad_alloc&)
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{}
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}
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return hr;
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}
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inline HRESULT return_com_error(const std::exception& err, const bstr_t &src = auto_attach(BSTR(NULL)),
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const uuid_t &iid=CLSID_NULL, const bstr_t &helpFile=bstr_t(), DWORD helpContext = -1)
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{
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return return_com_error( E_FAIL, bstr_t(err.what()),src,iid,helpFile, helpContext );
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}
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inline HRESULT return_com_error(const com_error& err, const bstr_t &src = bstr_t(), const uuid_t &iid = CLSID_NULL) throw()
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{
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const bstr_t &cursrc =err.source();
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const uuid_t &curiid =err.guid();
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// Return error info with more info.
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return return_com_error( err.hr(), err.description(), cursrc.is_null()?src:cursrc,
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curiid.is_null()?iid:curiid, err.help_file(), err.help_context());
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}
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inline void throw_com_error_(HRESULT hr, const com_ptr<IErrorInfo>& ei)
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{
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throw_error_handler<true>::throw_error(hr, ei);
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}
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// Raising an HRESULT with a message
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inline void raise_exception_t::operator()(const bstr_t& msg, HRESULT hr/* = E_FAIL*/) const
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{
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throw com_error(msg, hr);
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}
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// Raising an HRESULT
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inline void raise_exception_t::operator()(HRESULT hr) const
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{
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throw com_error(hr);
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}
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} // namespace impl
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/*! \addtogroup ErrorHandling
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*/
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//@{
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/** Throw COM error using com_error, using HRESULT and IErrorInfo.
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*/
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template<typename Itf> inline void throw_com_error(Itf* p, HRESULT hr)
|
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|
|
{
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|||
|
|
if (impl::supports_ErrorInfo(p))
|
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|
|
{
|
|||
|
|
com_ptr<IErrorInfo> ei = impl::GetErrorInfo();
|
|||
|
|
if (ei.is_null() == false) impl::throw_com_error_(hr, ei);
|
|||
|
|
}
|
|||
|
|
throw com_error(hr);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
template<bool OVERRIDE>
|
|||
|
|
inline void throw_error_handler<OVERRIDE>::throw_error(HRESULT hr, const com_ptr<IErrorInfo> &ei)
|
|||
|
|
{
|
|||
|
|
throw com_error(hr, ei);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
/**
|
|||
|
|
* Construct exception for a method called on a raw COM interface.
|
|||
|
|
*
|
|||
|
|
* This method aims to imbue the com_error with as much information about
|
|||
|
|
* the failure as possible:
|
|||
|
|
* - If the interface supports IErrorInfo, the information is taken from
|
|||
|
|
* the last ErrorInfo set on the current thread.
|
|||
|
|
* - If not, the HRESULT alone determines the message.
|
|||
|
|
*
|
|||
|
|
* Use this constructor immediately after an interface returns a
|
|||
|
|
* failure code before any other code can call SetErrorInfo and
|
|||
|
|
* overwrite the error.
|
|||
|
|
*
|
|||
|
|
* \param failure_source Interface operator method returned a failure code.
|
|||
|
|
* \param hr HRESULT value of error.
|
|||
|
|
*
|
|||
|
|
* \todo Can we add an optional user-defined message to this?
|
|||
|
|
*/
|
|||
|
|
template<typename Itf>
|
|||
|
|
com_error com_error_from_interface(Itf* failure_source, HRESULT hr)
|
|||
|
|
{
|
|||
|
|
if (impl::supports_ErrorInfo(failure_source))
|
|||
|
|
return com_error(hr, impl::GetErrorInfo());
|
|||
|
|
else
|
|||
|
|
return com_error(hr);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
template<typename Itf>
|
|||
|
|
com_error com_error_from_interface(
|
|||
|
|
com_ptr<Itf> failure_source, HRESULT hr)
|
|||
|
|
{
|
|||
|
|
return com_error_from_interface(failure_source.get(), hr);
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
//@}
|
|||
|
|
}
|
|||
|
|
|
|||
|
|
#pragma warning(pop)
|
|||
|
|
|
|||
|
|
#endif
|