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#include <windows.h>
#include "common.h"
/* Win32Error: Exception for Windows API errors. */
Win32Error::Win32Error() : dwErr(GetLastError()) {}
Win32Error::Win32Error(const DWORD dwErr) : dwErr(dwErr) {}
Win32Error::~Win32Error()
{
if (m_szMsg)
HeapFree(GetProcessHeap(), 0, m_szMsg);
if (m_wszMsg)
HeapFree(GetProcessHeap(), 0, m_wszMsg);
}
const char* Win32Error::what() const noexcept
{
if (!m_szMsg)
FormatMessageA(
FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwErr,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(char*)&m_szMsg,
0, NULL);
return m_szMsg;
}
const wchar_t* Win32Error::WhatW() const noexcept
{
if (!m_wszMsg)
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
dwErr,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(wchar_t*)&m_wszMsg,
0, NULL);
return m_wszMsg;
}
/* Library: Wrapper for loading and freeing dynamically linked libraries. */
Library::Library(const wchar_t* const wszLibrary)
{
m_hModule = LoadLibrary(wszLibrary);
if (!m_hModule)
throw Win32Error();
}
Library::~Library()
{
FreeLibrary(m_hModule);
}
/* Convert narrow unmanaged string to wide managed string. */
std::wstring WstrFromSz(const char* sz, int iCp)
{
int cbMultiByte = strlen(sz)+1;
int cchWideChar = MultiByteToWideChar(iCp, 0, sz, cbMultiByte, NULL, 0);
std::wstring wstr(cchWideChar, 0);
if (!MultiByteToWideChar(iCp, 0, sz, cbMultiByte, wstr.data(), cchWideChar))
throw Win32Error(GetLastError());
return wstr;
}
/* Move message box to center of main window. */
static LRESULT CALLBACK CBTProc(const int nCode, const WPARAM wParam, const LPARAM lParam) noexcept
{
extern HWND g_hWnd;
if (!g_hWnd || nCode < 0 || nCode != HCBT_ACTIVATE)
return CallNextHookEx(0, nCode, wParam, lParam);
HWND hWnd = (HWND)wParam;
long lStyle = GetWindowLong(hWnd, GWL_STYLE);
if (!(lStyle & WS_POPUP)) return 0;
RECT rcMain, rcMsg;
GetWindowRect(g_hWnd, &rcMain);
GetWindowRect(hWnd, &rcMsg);
SetWindowPos(hWnd, NULL,
rcMain.left+(rcMain.right-rcMain.left)/2-(rcMsg.right-rcMsg.left)/2,
rcMain.top+(rcMain.bottom-rcMain.top)/2-(rcMsg.bottom-rcMsg.top)/2,
-1, -1,
SWP_NOZORDER|SWP_NOSIZE|SWP_NOACTIVATE);
return 0;
}
/* Show message box owned by and centered in the main window. */
int EBMessageBox(const wchar_t* const wszText, const wchar_t* const wszCaption, const unsigned uType)
{
extern HWND g_hWnd;
HHOOK hHook = require(SetWindowsHookEx(WH_CBT, CBTProc, (HINSTANCE)NULL, GetCurrentThreadId()));
int r = MessageBox(g_hWnd, wszText, wszCaption, uType);
require(UnhookWindowsHookEx(hHook));
return r;
}
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