Update

Kha/Backends/Kore-hxcpp/khacpp/test/snippets/messagebox/MessageBox.hx

@@ -0,0 +1,24 @@
+import cpp.*;
+
+// Windows only.
+// Compile with "-D no_console" for best effect
+
+@:cppFileCode("#include <windows.h>")
+class MessageBox
+{
+   public static function main()
+   {
+      var messageBox:cpp.Function< Pointer< Void > ->
+                                   ConstCharStar ->
+                                   ConstCharStar ->
+                                   Int  -> Int,  cpp.abi.Winapi > =
+           Function.getProcAddress("User32.dll", "MessageBoxA");
+
+      messageBox(null, "Hello, World!", "Hxcpp MessageBox", 0);
+
+      // This will actually print out if you have started from a console (not double-click)
+      trace("Sneaky trace");
+   }
+}
+
+

Kha/Backends/Kore-hxcpp/khacpp/test/snippets/messagebox/compile.hxml

@@ -0,0 +1,4 @@
+-main MessageBox
+-cpp cpp
+-D no_console
+-cmd start cpp/MessageBox.exe