Win32 API input box

#include <windows.h>#include <string>#ifdef UNICODEtypedef std::wstring InputBoxStringType;typedef LPWSTR InputBoxCharPointerType;typedef wchar_t InputBoxCharType;#define InputBoxString(x) L##x#elsetypedef std::string InputBoxStringType;typedef LPSTR InputBoxCharPointerType;typedef char InputBoxCharType;#define InputBoxString(x) x#endifLRESULT CALLBACK InputBoxWndProc(HWND WndHandle, UINT Message, WPARAM wParam, LPARAM lParam){	static InputBoxStringType *Results = 0;	static HWND InputLabelHandle = 0;	static HWND InputHandle = 0;	switch(Message)	{	case WM_NCCREATE:		{			Results = (InputBoxStringType*)((CREATESTRUCT*)lParam)->lpCreateParams;			break;		}	case WM_CLOSE:	case WM_DESTROY:		{			PostQuitMessage(0);			break;		}	case WM_COMMAND:		{			int NotifyCode = HIWORD(wParam);			int ControlId = LOWORD(wParam);			HWND ControlHandle = (HWND)lParam;			switch(ControlId)			{			case 1001:				{					InputHandle = ControlHandle;					break;				}			case 1002:				{					if(InputHandle == 0 || !Results)					{						PostQuitMessage(0);						break;					}					InputBoxCharPointerType Buffer = new InputBoxCharType[256]; 					GetWindowText(InputHandle, Buffer, 256);					*Results = Buffer;					PostQuitMessage(0);					break;				}			case 1003:				{					if(InputHandle == 0 || !Results)					{						PostQuitMessage(0);						break;					}					*Results = InputBoxString("");					PostQuitMessage(0);					break;				}			}			break;		}	}	return DefWindowProc(WndHandle, Message, wParam, lParam);}static InputBoxStringType ShowInputBox(HWND OwnerWindowHandle, const InputBoxStringType &InputLabel, const InputBoxStringType &InputText, const InputBoxStringType &Title){	WNDCLASS WndClass;	HWND DialogHandle = 0;	HWND InputLabelHandle = 0;	HWND InputHandle = 0;	HWND OkButtonHandle = 0, CancelButtonHandle = 0;	InputBoxStringType Result = InputBoxString("");	ZeroMemory(&WndClass, sizeof(WNDCLASS));	WndClass.hbrBackground = GetSysColorBrush(COLOR_3DFACE);	WndClass.hIcon = LoadIcon(0, IDI_APPLICATION);	WndClass.hCursor = LoadCursor(0, IDC_ARROW);	WndClass.hInstance = GetModuleHandle(0);	WndClass.lpszClassName = InputBoxString("InputBox");	WndClass.lpfnWndProc = InputBoxWndProc;	RegisterClass(&WndClass);	int X = 0, Y = 0;	int Width = 0, Height = 0;	RECT TempRect;	GetWindowRect(GetDesktopWindow(), &TempRect);	Width = (int)((float)(TempRect.right - TempRect.left) * 0.25f);	Height = 150;	X = ((TempRect.right - TempRect.left) / 2) - (Width / 2);	Y = ((TempRect.bottom - TempRect.top) / 2) - (Height / 2);	DialogHandle = CreateWindowEx(0, InputBoxString("InputBox"), Title.c_str(), WS_OVERLAPPEDWINDOW | WS_VISIBLE, X, Y, Width, Height, OwnerWindowHandle, 0, GetModuleHandle(0), (LPVOID)&Result);	int LabelX = 5, LabelY = 5;	int LabelWidth = Width - 10, LabelHeight = 24;	InputLabelHandle = CreateWindowEx(0, InputBoxString("STATIC"), InputLabel.c_str(), WS_CHILD | WS_VISIBLE, LabelX, LabelY, LabelWidth, LabelHeight, DialogHandle, 0, GetModuleHandle(0), 0);	int TBoxX = 5, TBoxY = 29;	int TBoxWidth = Width - 20, TBoxHeight = 24;	InputHandle = CreateWindowEx(0, InputBoxString("EDIT"), InputText.c_str(), WS_BORDER | WS_CHILD | WS_VISIBLE, TBoxX, TBoxY, TBoxWidth, TBoxHeight, DialogHandle, (HMENU)1001, GetModuleHandle(0), 0);	int OkBtnX = (Width / 2) - 75, OkBtnY = Height - 60;	int OkBtnWidth = 75, OkBtnHeight = 24;	OkButtonHandle = CreateWindowEx(0, InputBoxString("BUTTON"), InputBoxString("Ok"), WS_CHILD | WS_VISIBLE, OkBtnX, OkBtnY, OkBtnWidth, OkBtnHeight, DialogHandle, (HMENU)1002, GetModuleHandle(0), 0);	int CancelBtnX = (Width / 2) + 25, CancelBtnY = Height - 60;	int CancelBtnWidth = 75, CancelBtnHeight = 24;	CancelButtonHandle = CreateWindowEx(0, InputBoxString("BUTTON"), InputBoxString("Cancel"), WS_CHILD | WS_VISIBLE, CancelBtnX, CancelBtnY, CancelBtnWidth, CancelBtnHeight, DialogHandle, (HMENU)1003, GetModuleHandle(0), 0);	MSG Message;	ZeroMemory(&Message, sizeof(MSG));	while(Message.message != WM_QUIT)	{		if(PeekMessage(&Message, 0, 0, 0, PM_REMOVE))		{			TranslateMessage(&Message);			DispatchMessage(&Message);		}	}	return Result;}#undef InputBoxStringint WINAPI WinMain(HINSTANCE, HINSTANCE, LPSTR, int){	InputBoxStringType Result = ShowInputBox(0, L"Please enter your name:", L"Unknown", L"Name Entry");	MessageBox(0, Result.c_str(), L"Your name is:", MB_OK);	return 0;}