#include <windows.h>

#include "common.h"

Win32Error::Win32Error(const DWORD dwErr)
{
	m_dwErr = dwErr;
	FormatMessageA(
	    FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
	    NULL,
	    m_dwErr,
	    MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
	    (char*)&m_szMsg,
	    0, NULL
	);
}

Win32Error::~Win32Error()
{
	if (m_szMsg)
		HeapFree(GetProcessHeap(), 0, m_szMsg);
}

const char* Win32Error::what(void) const noexcept 
{
	return m_szMsg;
}

Library::Library(const TCHAR* const tszLibrary)
{
	m_hModule = LoadLibrary(tszLibrary);
	if (!m_hModule)
		throw Win32Error(GetLastError());
}

Library::~Library()
{
	FreeLibrary(m_hModule);
}

FARPROC Library::GetProcAddress(const char* const szProc)
{
	return ::GetProcAddress(m_hModule, szProc);
}