MiniGUI源码分析--hellowworld(1) ：MiniGUIMain中有什么奥秘

上一篇： MiniGUI源码分析-- 开始篇

接下来，通过剖析MiniGUI的最简单的例程，来详细说明MiniGUI程序是如何创建和运行的。

这个例程，可以从很多地方得到，凡是接触过MiniGUI的朋友，首先接触的便是这个例子，为了方便大家阅读，贴在下面

/* 
** $Id: helloworld.c,v 1.38 2007-10-25 07:56:45 weiym Exp $
**
** Listing 2.1
**
** helloworld.c: Sample program for MiniGUI Programming Guide
**      The first MiniGUI application.
**
** Copyright (C) 2004 ~ 2007 Feynman Software.
**
** License: GPL
*/

#include <stdio.h>
#include <string.h>

#include <minigui/common.h>
#include <minigui/minigui.h>
#include <minigui/gdi.h>
#include <minigui/window.h>

static char welcome_text [512];
static char msg_text [256];
static RECT welcome_rc = {10, 100, 600, 400};
static RECT msg_rc = {10, 100, 600, 400};

static const char* syskey = "";

static int last_key = -1;
static int last_key_count = 0;

static void make_welcome_text (void)
{
    const char* sys_charset = GetSysCharset (TRUE);
    const char* format;

    if (sys_charset == NULL)
        sys_charset = GetSysCharset (FALSE);

    SetRect (&welcome_rc,  10, 10, g_rcScr.right - 10, g_rcScr.bottom / 2 - 10);
    SetRect (&msg_rc, 10, welcome_rc.bottom + 10, g_rcScr.right - 10, g_rcScr.bottom - 20);

    if (strcmp (sys_charset, FONT_CHARSET_GB2312_0) == 0 
            || strcmp (sys_charset, FONT_CHARSET_GBK) == 0) {
        format = "欢迎来到 MiniGUI 的世界! 如果您能看到该文本, 则说明 MiniGUI Version %d.%d.%d 可在该硬件上运行!";
    }
    else if (strcmp (sys_charset, FONT_CHARSET_BIG5) == 0) {
        format = "欢迎来到 MiniGUI 的世界! 如果您能看到该文本, 则说明 MiniGUI Version %d.%d.%d 可在该硬件上运行!";
    }
    else {
        format = "Welcome to the world of MiniGUI. \nIf you can see this text, MiniGUI Version %d.%d.%d can run on this hardware board.";
    }

    sprintf (welcome_text, format, MINIGUI_MAJOR_VERSION, MINIGUI_MINOR_VERSION, MINIGUI_MICRO_VERSION);

    strcpy (msg_text, "No message so far.");
}

static int HelloWinProc(HWND hWnd, int message, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;

    syskey = "";

    switch (message) {
        case MSG_CREATE:
            make_welcome_text ();
            SetTimer (hWnd, 100, 200);
            break;

        case MSG_TIMER:
            sprintf (msg_text, "Timer expired, current tick count: %ul.", 
                            GetTickCount ());
            InvalidateRect (hWnd, &msg_rc, TRUE);
            break;
            
        case MSG_LBUTTONDOWN:
            strcpy (msg_text, "The left button pressed.");
            InvalidateRect (hWnd, &msg_rc, TRUE);
            break;

        case MSG_LBUTTONUP:
            strcpy (msg_text, "The left button released.");
            InvalidateRect (hWnd, &msg_rc, TRUE);
            break;

        case MSG_RBUTTONDOWN:
            strcpy (msg_text, "The right button pressed.");
            InvalidateRect (hWnd, &msg_rc, TRUE);
            break;

        case MSG_RBUTTONUP: