- dynamically import GetDpiForWindow from USER32.dll in case it does …

…not exist, use try/catch to return a default value

libraries/ZWidget/src/window/win32/win32window.cpp

@@ -271,9 +271,51 @@ int Win32Window::GetPixelHeight() const
 	return box.bottom;
 }
 
+typedef UINT(WINAPI* GetDpiForWindow_t)(HWND);
+double OSGetWindowDPIFactor(HWND winhandle)
+{
+	if (winhandle == nullptr)
+	{
+		return 1.0;
+	}
+
+	HMODULE hMod = LoadLibrary(TEXT("User32.dll"));
+	if (hMod == nullptr)
+	{
+		throw std::runtime_error("Failed to load User32.dll");
+	}
+
+	GetDpiForWindow_t pGetDpiForWindow = reinterpret_cast<GetDpiForWindow_t>(GetProcAddress(hMod, "GetDpiForWindow"));
+	if (pGetDpiForWindow == nullptr)
+	{
+		FreeLibrary(hMod);
+		throw std::runtime_error("Failed to get GetDpiForWindow function");
+	}
+
+	UINT dpi = pGetDpiForWindow(winhandle);
+	if (dpi == 0)
+	{
+		FreeLibrary(hMod);
+		throw std::runtime_error("GetDpiForWindow failed");
+	}
+
+	FreeLibrary(hMod);
+	return static_cast<double>(dpi) / 96.0;
+}
+
 double Win32Window::GetDpiScale() const
 {
-	return GetDpiForWindow(WindowHandle) / 96.0;
+	double retval;
+	try
+	{
+		retval = OSGetWindowDPIFactor(WindowHandle);
+	}
+	catch (std::runtime_error& e)
+	{
+		retval = 1.0;
+		//DPrintf(DMSG_NOTIFY, "Caught error: %s\n", e.what());
+	}
+	return retval;
 }
 
 std::string Win32Window::GetClipboardText()