頭文件是很好的用戶與源文件之間的接口，好的頭文件可以看出，具體函數的使用以及各參數的含義。
毋庸置疑，minigui作爲開源軟件，也做到了這一點。
使用minigui，只要熟悉了其的頭文件，就再也不怕對其的瞭解是書本或教程上的片面的東西了。
以下摘自window.h ,示例如下：
/**
* \def MSG_CREATE
* \brief Indicates the window has been created, and gives you a chance to initialize your private objects.
*
* This messages is sent to the window after the window has been created
* and registered to the system. You can initialize your own objects when
* you receive this message, and return zero to the system in order to
* indicates the success of your initialization. If you return non-zero to
* the system after handled this message, the created window will be
* destroyed immediately.
*
* \code
* MSG_CREATE for main windows:
* PMAINWINCREATE create_info = (PMAINWINCREATE)lParam;
*
* MSG_CREATE for controls:
* HWND parent = (HWND)wParam;
* DWORD add_data = (DWORD)lParam;
* \endcode
*
* \param create_info The pointer to the MAINWINCREATE structure which is
* passed to CreateMainWindow function.
* \param parent The handle to the parent window of the control.
* \param add_data The first additional data passed to CreateWindowEx function.
*
* \sa CreateMainWindow, CreateWindowEx, MAINWINCREATE
*/
#define MSG_CREATE 0x0060一、minigui的各控件的風格、消息可見各控件的頭文件。如static.h;
二、minigui的控件標示符，除預定義的幾個外，使用中都需用戶自己在創建控件時指定。
預定義的幾個控件標示符可見window.h,如下：
/* Standard control IDs */
#define IDC_STATIC 0
#define IDOK 1
#define IDCANCEL 2
#define IDABORT 3
#define IDRETRY 4
#define IDIGNORE 5
#define IDYES 6
#define IDNO 7