throw helpful errors when params supplied are not ctype pointers (#122)

tests/xtest_raygui2.py

@@ -0,0 +1,49 @@
+import pyray
+from pyray import *
+import pytest
+
+SCREEN_WIDTH = 640
+SCREEN_HEIGHT = 480
+
+
+def main():
+    init_window(SCREEN_WIDTH, SCREEN_HEIGHT, "raygui")
+    set_exit_key(KeyboardKey.KEY_ESCAPE)
+    set_target_fps(30)
+
+    _bool_pointer = pyray.ffi.new("bool *", True)
+    _bool = True
+    _float = 5.5
+    _float_pointer = pyray.ffi.new("float *", 5.2)
+    color = RED
+    color_pointer = Color()
+    _int=0
+    _int_pointer = pyray.ffi.new("int *", 0)
+    _string ="cant edit this string"
+    _string_pointer = pyray.ffi.new("char []", b"0123456789")
+
+    while not window_should_close():
+        begin_drawing()
+        clear_background(WHITE)
+
+        gui_check_box((40, 40, 30, 30), "checkbox", _bool_pointer)
+        with pytest.raises(TypeError):
+            gui_check_box(Rectangle(40, 40, 100, 100), "checkbox", _bool)
+
+        gui_color_bar_alpha((40, 80, 100, 20), "bar", _float_pointer)
+        with pytest.raises(TypeError):
+            gui_color_bar_alpha((40, 80, 100, 20), "bar", _float)
+
+        gui_color_picker((40,120, 100, 100), "color", color_pointer)
+        with pytest.raises(TypeError):
+            gui_color_picker((40,120, 100, 100), "color", color)
+
+        gui_text_box((40,230, 100, 30), _string_pointer, 10, True)
+        gui_text_box((200,230, 100, 30), _string, 10, True)
+
+        gui_tab_bar((40,300, 100, 30), ["foo", "boo"], 2, _int_pointer)
+        with pytest.raises(TypeError):
+            gui_tab_bar((40,300, 100, 30), ["foo", "boo"], 2, _int)
+
+        end_drawing()
+main()