im trying to make the window transparent

but the code crashes

```haxe
var setWindowLong:cpp.Function< Pointer< Void > ->
Int ->
UInt -> Int, cpp.abi.Winapi> =
Function.getProcAddress("User32.dll", "SetWindowLongA");

var setLayeredWindowAttributes:cpp.Function< Pointer< Void > ->
UInt ->
UInt ->
UInt -> Int, cpp.abi.Winapi> =
Function.getProcAddress("User32.dll", "SetLayeredWindowAttributes");

var getActiveWindow:cpp.Function< Pointer< Void > ->
Pointer< Void >, cpp.abi.Winapi> =
Function.getProcAddress("User32.dll", "GetActiveWindow");

var handle = getActiveWindow(null);

setWindowLong(handle, -20, 0x00080000);
setLayeredWindowAttributes(handle, 0, 0, 0x00000001);
```
help me please
im using flixel
i put this code on the main function on my program's main.hx