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#include <utility>
#include <windows.h>
#include "win.h"
Win32Error::Win32Error() : code(GetLastError()) {}
Win32Error::Win32Error(const DWORD code) : code(code) {}
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,
code,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(char*)&m_szMsg,
0, NULL);
return m_szMsg;
}
const wchar_t* Win32Error::What() const noexcept
{
if (!m_wszMsg)
FormatMessage(
FORMAT_MESSAGE_ALLOCATE_BUFFER|FORMAT_MESSAGE_FROM_SYSTEM|FORMAT_MESSAGE_IGNORE_INSERTS,
NULL,
code,
MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
(wchar_t*)&m_wszMsg,
0, NULL);
return m_wszMsg;
}
std::optional<Library> Library::Maybe(const wchar_t* const lib)
{
HMODULE hModule = LoadLibrary(lib);
if (!hModule) return {};
return Library(hModule);
}
Library::Library(const HMODULE hModule) : m_hModule(hModule) {}
Library::Library(const wchar_t* const lib)
{
m_hModule = LoadLibrary(lib);
if (!m_hModule)
throw Win32Error();
}
Library::~Library()
{
FreeLibrary(m_hModule);
}
int EBMessageBox(const wchar_t* const wszText, const wchar_t* const wszCaption, const unsigned uType)
{
extern HWND g_hWnd;
auto proc = [](const int nCode, const WPARAM wParam, const LPARAM lParam) noexcept
-> LRESULT CALLBACK
{
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;
};
HHOOK hHook = require(SetWindowsHookEx(WH_CBT, proc, (HINSTANCE)NULL, GetCurrentThreadId()));
int r = MessageBox(g_hWnd, wszText, wszCaption, uType);
require(UnhookWindowsHookEx(hHook));
return r;
}
int GetRelativeCursorPos(HWND hWnd, POINT* pt)
{
RECT rc;
if (!GetClientRect(hWnd, &rc)) return 0;
SetLastError(ERROR_SUCCESS);
if (!MapWindowPoints(hWnd, NULL, (POINT*)&rc, 2)) return 0;
POINT ptMouse;
if (!GetCursorPos(&ptMouse)) return 0;
pt->x = ptMouse.x-rc.left;
pt->y = ptMouse.y-rc.top;
return 1;
}
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