Who needs C++ standards! Undefined behavior is way more fun!

cringe.cpp

void HandleEvents(HWND hwnd, UINT message, WPARAM wParam, LPARAM lparam)
{
	switch (LOWORD(wParam))
	{
		case 1: // "Scan" button
		{
			//MessageBox(NULL, L"Scan button", L"You clicked scan", MB_OK);
			// Disable the window, get the text from it, then start the scan threads.
			HWND txtbox = GetDlgItem(hwnd, 8);
			Edit_Enable(txtbox, FALSE);

			// Plenty of space. Get the damn string.
#if 1
			std::wstring str;
			str.reserve(1 << 16);
			// This is HORRIBLY undefined behavior to copy directly into the buffer
			// but whatever. I want to be lazy. If it breaks then I'll fix it correctly.
			// Technically, this should be valid but the C++ standards commitee decided
			// that .data() shouldn't do the below but rather should return the exact
			// same thing as .c_str(). Fuck that shit.
			if (GetDlgItemText(hwnd, 8, (wchar_t*)str.data(), str.capacity()) == -1)
			{
				MessageBox(NULL, L"Failed to get text!", L"Error", MB_OK | MB_ICONERROR);
				Edit_Enable(txtbox, TRUE);
				UpdateActivityLabel(L"Ready.");
				break;
			}

			// Nasty hack for the windows libc++
#ifdef _MSC_VER
			str._Mysize = wcslen((wchar_t*)str.data());
#endif
			
#else       // This is the stupid and not-cool but correct version of the above.
			wchar_t buf[(1 << 16)];
			if (GetDlgItemText(hwnd, 8, buf, (1 << 16)) == -1)
			{
				MessageBox(NULL, L"Failed to get text!", L"Error", MB_OK | MB_ICONERROR);
				Edit_Enable(txtbox, TRUE);
				UpdateActivityLabel(L"Ready.");
				break;
			}

			std::wstring str = buf;
#endif

			// Deallocate any unneeded space
			//str.shrink_to_fit();

			// Add our first function call to the thread pool and submit.
			UpdateActivityLabel(L"Queueing function...");
			th->AddQueue(CheckDirectory, _wcsdup( str.c_str()));
			th->Submit();

			UpdateActivityLabel(L"Waiting on threads...");

			break;
		}
		case 2: // "Cancel" button
			MessageBox(NULL, L"Cancel Button", L"You clicked cancel!", MB_OK);
			break;
		case 3: // Listbox root window
			break;
		case 4: // File menu item "Show message"
			break;
		case 5: // File menu item "Exit"
			// Destroy the thread pool
			if (th)
				delete th;

			// Tell windows "Bye!"
			PostQuitMessage(0);
			break;
		default:
			// We don't have a handler for this item.
			break;
	}
}