public static extern ATOM RegisterClassExW(ref WNDCLASSEXW arg1);
public void Run(INativeWindowStartupInfo startupInfo)
{
GdiplusStartupInput gdiPlusStartupInput = GdiplusStartupInput.CreateV1();
GdiPlusAPI.CheckStatus(GdiPlusAPI.GdiplusStartup(out var gdiPlusToken, ref gdiPlusStartupInput, out _));
IntPtr hInstance = Win32API.GetModuleHandleW(null);
var windowClass = new WNDCLASSEXW();
windowClass.cbSize = (uint)Marshal.SizeOf <WNDCLASSEXW>();
windowClass.lpfnWndProc = WindowProc;
windowClass.hInstance = hInstance;
windowClass.lpszClassName = WindowClassName;
var atom = Win32API.RegisterClassExW(ref windowClass);
if (atom == 0)
{
throw new InvalidOperationException("Failed to register window class.");
}
try
{
const int CW_USEDEFAULT = unchecked ((int)0x80000000);
IntPtr hwnd = Win32API.CreateWindowExW(
0,
WindowClassName,
startupInfo.Title,
Win32WindowStyle.WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT, CW_USEDEFAULT,
startupInfo.Width, startupInfo.Height,
IntPtr.Zero,
IntPtr.Zero,
hInstance,
IntPtr.Zero
);
if (hwnd == IntPtr.Zero)
{
throw new InvalidOperationException("Failed to create a window.");
}
var window = new Win32Window(hwnd, startupInfo);
windows.Add(hwnd, window);
startupInfo.OnCreate(window);
try
{
Win32API.ShowWindow(hwnd, Win32ShowWindowCommand.SW_SHOWNORMAL);
MSG msg = new MSG();
int mRet;
while ((mRet = Win32API.GetMessageW(ref msg, IntPtr.Zero, 0, 0)) != 0)
{
if (mRet == -1)
{
throw new InvalidOperationException("Failed to retrieve a message.");
}
Win32API.TranslateMessage(ref msg);
Win32API.DispatchMessageW(ref msg);
}
}
finally
{
// usually window will be destroyed before this point, unless error occurs
if (Win32API.DestroyWindow(hwnd) == 0)
{
// todo: log warning ?
}
}
}
finally
{
if (Win32API.UnregisterClassW(WindowClassName, hInstance) == 0)
{
// todo: log warning
}
// todo: use separate finally for GDI+
GdiPlusAPI.GdiplusShutdown(gdiPlusToken);
}
}