From 7138a921143c801ef42f4190b2242ccce38ff8a1 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?John=20Ankarstr=C3=B6m?= <john@ankarstrom.se>
Date: Sun, 31 Jul 2022 00:15:31 +0200
Subject: Move EBMessageBox's CBTProc into lambda.

---
 c/common.cpp | 50 +++++++++++++++++++++++++-------------------------
 1 file changed, 25 insertions(+), 25 deletions(-)

diff --git a/c/common.cpp b/c/common.cpp
index 614bfeb..77d669c 100644
--- a/c/common.cpp
+++ b/c/common.cpp
@@ -50,7 +50,7 @@ wstring_owner WsoFromSz(const char* const sz, const int iCp)
 	wchar_t* wsz = new wchar_t[cchWideChar];
 	if (!MultiByteToWideChar(iCp, 0, sz, cbMultiByte, wsz, cchWideChar)) {
 		delete wsz;
-		throw Win32Error(GetLastError());
+		throw Win32Error();
 	}
 	return wsz;
 }
@@ -108,34 +108,34 @@ Library::~Library()
 	FreeLibrary(m_hModule);
 }
 
-/* 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()));
+
+	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;
-- 
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