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40 lines
1.1 KiB
C++
40 lines
1.1 KiB
C++
#include "windows.h"
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#include "exception.hpp"
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#include <llarp/util/str.hpp>
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#include <array>
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namespace llarp::win32
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{
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error::error(std::string msg) : error{GetLastError(), std::move(msg)}
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{}
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error::error(DWORD err, std::string msg)
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: std::runtime_error{fmt::format("{}: {} (code={})", msg, error_to_string(err), err)}
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{}
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std::string
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error_to_string(DWORD err)
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{
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// mostly yoinked from https://stackoverflow.com/a/45565001
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LPTSTR psz{nullptr};
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const DWORD cchMsg = FormatMessage(
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FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS | FORMAT_MESSAGE_ALLOCATE_BUFFER,
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nullptr,
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err,
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MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
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reinterpret_cast<LPTSTR>(&psz),
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0,
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nullptr);
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if (cchMsg <= 0)
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{
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// cannot get message for error, reset the last error here so it does not propagate
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::SetLastError(0);
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return "unknown error";
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}
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auto deleter = [](void* p) { ::LocalFree(p); };
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std::unique_ptr<TCHAR, decltype(deleter)> ptrBuffer{psz, deleter};
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return std::string{ptrBuffer.get(), cchMsg};
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}
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} // namespace llarp::win32
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