Initialization and termination functions

Data Structures
struct	_DESKTOPOPS

Macros
#define	ReinitDesktop()   ReinitDesktopEx (TRUE)
	Re-initializes the desktop including the local system text. More...
#define	MiniGUIMain
	The main entry of a MiniGUI application. More...
#define	IDM_DTI_FIRST   (300)
	The minimum interger value of command ID when user customize desktop menu. More...

Typedefs
typedef struct _DESKTOPOPS	DESKTOPOPS

Functions
MG_EXPORT BOOL GUIAPI	ReinitDesktopEx (BOOL init_sys_text)
	Re-initializes the desktop. More...
MG_EXPORT void GUIAPI	ExitGUISafely (int exitcode)
	Exits your MiniGUI application safely. More...
MG_EXPORT DESKTOPOPS *GUIAPI	SetCustomDesktopOperationSet (DESKTOPOPS *usr_dsk_ops)
	Set customer desktop operation set. More...
MG_EXPORT void GUIAPI	DesktopUpdateAllWindow (void)
	Update all visible windows on the desktop. More...

Detailed Description

Normally, the only entry of any MiniGUI application is MiniGUIMain. The application will terminate when you call exit(3) or just return from MiniGUIMain.

Example 1:

/*
 * This program parses the command line arguments.
 * If the user specified a layer name by using "-layer <layer_name", 
 * the program will try to join the layer, otherwise create a new layer.
 */
int MiniGUIMain (int args, const char* arg[])
{
#ifdef _MGRM_PROCESSES
    int i;
    const char* layer = NULL;

    for (i = 1; i < args; i++) {
        if (strcmp (arg[i], "-layer") == 0) {
            layer = arg[i + 1];
            break;
        }
    }

    if (GetLayerInfo (layer, NULL, NULL, NULL) == INV_LAYER_HANDLE) {
        printf ("GetLayerInfo: the requested layer does not exist.\n");
    }

    if (JoinLayer (layer, arg[0], 0, 0) == INV_LAYER_HANDLE) {
        printf ("JoinLayer: invalid layer handle.\n");
        exit (1);
    }
#endif

    ...

    return 0;
}

Example 2:

/*
 * This is a every simple sample for MiniGUI.
 * It will create a main window and display a string of "Hello, world!" in it.
 */
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

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

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

    switch (message) {
        case MSG_PAINT:
            hdc = BeginPaint (hWnd);
            TextOut (hdc, 0, 0, "Hello, world!");
            EndPaint (hWnd, hdc);
        break;

        case MSG_CLOSE:
            DestroyMainWindow (hWnd);
            PostQuitMessage (hWnd);
        return 0;
    }

    return DefaultMainWinProc(hWnd, message, wParam, lParam);
}

static void InitCreateInfo (PMAINWINCREATE pCreateInfo)
{
    pCreateInfo->dwStyle = WS_CAPTION | WS_VISIBLE;
    pCreateInfo->dwExStyle = 0;
    pCreateInfo->spCaption = "Hello, world!" ;
    pCreateInfo->hMenu = 0;
    pCreateInfo->hCursor = GetSystemCursor (0);
    pCreateInfo->hIcon = 0;
    pCreateInfo->MainWindowProc = HelloWinProc;
    pCreateInfo->lx = 0; 
    pCreateInfo->ty = 0; 
    pCreateInfo->rx = 320;
    pCreateInfo->by = 240;
    pCreateInfo->iBkColor = PIXEL_lightwhite; 
    pCreateInfo->dwAddData = 0;
    pCreateInfo->hHosting = HWND_DESKTOP;
}

int MiniGUIMain (int args, const char* arg[])
{
    MSG Msg;
    MAINWINCREATE CreateInfo;
    HWND hMainWnd;

#ifdef _MGRM_PROCESSES
    JoinLayer (NAME_DEF_LAYER, arg[0], 0, 0);
#endif

    InitCreateInfo (&CreateInfo);

    hMainWnd = CreateMainWindow (&CreateInfo);
    if (hMainWnd == HWND_INVALID)
        return -1;

    while (GetMessage (&Msg, hMainWnd)) {
        DispatchMessage (&Msg);
    }

    MainWindowThreadCleanup (hMainWnd);
    return 0;
}

Macro Definition Documentation

#define IDM_DTI_FIRST   (300)

The minimum interger value of command ID when user customize desktop menu.

Definition at line 1506 of file minigui.h.

#define MiniGUIMain

Value:

MiniGUIAppMain (int args, const char* argv[]); \
int main_entry (int args, const char* argv[]) \
{ \
    int iRet = 0; \
    if (InitGUI (args, argv) != 0) { \
        return 1; \
    } \
    iRet = MiniGUIAppMain (args, argv); \
    TerminateGUI (iRet); \
    return iRet; \
} \
int MiniGUIAppMain

The main entry of a MiniGUI application.

This function should be defined by your application. Before Version 1.6.1, MiniGUI defines main() function in libminigui library for your application, and call MiniGUIMain() in this main() function. The main() defined by MiniGUI is responsible of initializing and terminating MiniGUI.

After version 1.6.1, MiniGUI defines MiniGUIMain as a macro.

Parameters

args	The number of arguments passed to main() by operating system.
argv	The arguments passed to main() by operating system.

Returns

The exit status will be retured to the parent process.

Definition at line 1487 of file minigui.h.

#define ReinitDesktop

(

)

ReinitDesktopEx (TRUE)

Re-initializes the desktop including the local system text.

Returns

TRUE on success, otherwise FALSE.

Note

This function defined as a macro calling ReinitDesktopEx with init_sys_text set to TRUE.

See also

ReinitDesktopEx

Definition at line 1445 of file minigui.h.

Typedef Documentation

typedef struct _DESKTOPOPS DESKTOPOPS

Desktop operation set

Function Documentation

void GUIAPI DesktopUpdateAllWindow

(

void

)

Update all visible windows on the desktop.

On MiniGUI-Processes update all the main windows of the client and desktop window, and it only can be used by mginit on MiniGUI-Processes. On MiniGUI-Threads and MiniGUI-Standalone update all visible windows and desktop window.

void GUIAPI ExitGUISafely

(

int

exitcode

)

Exits your MiniGUI application safely.

Calling this function will terminate your MiniGUI application. This function will restore console attributes and call exit() function and pass exitcode to it.

Parameters

exitcode

The exit status will be passed to exit(3) function.

Returns

This function will not return.

See also

exit(3)

BOOL GUIAPI ReinitDesktopEx

(

BOOL

init_sys_text

)

Re-initializes the desktop.

When you changed the charset or the background picture of the desktop, you should call this function to re-initialize the local system text (when init_sys_text is TRUE), the background picture, and the desktop menu.

Parameters

init_sys_text

Indicates whether to initialize the local system text.

Returns

TRUE on success, otherwise FALSE.

See also

ReinitDesktop

DESKTOPOPS *GUIAPI SetCustomDesktopOperationSet

(

DESKTOPOPS *

usr_dsk_ops

)

Set customer desktop operation set.

Parameters

usr_dsk_ops

The pointer to user customer desktop operation set.

Returns

Old desktop operation set.

static void* this_init(void)
{
    ......
}

static void this_deinit(void* context)
{
    ......
}

static void this_paint_desktop(void* context,\
                        HDC dc_desktop, const RECT* inv_rc)
{
    ......
}

static void this_keyboard_handler(void* context, int message,\
                                    WPARAM wParam, LPARAM lParam)
{
    ......
}

static void this_mouse_handler(void* context, int message,\
                                    WPARAM wParam, LPARAM lParam)
{
    ......
}

static void this_customize_desktop_menu (void* context,\
                                          HMENU hmnu, int start_pos)
{
    ......
}

static void this_desktop_menucmd_handler (void* context, int id)
{
    ......
}

static DESKTOPOPS this_dsk_ops =
{
    this_init,
    this_deinit,
    this_paint_desktop,
    this_keyboard_handler,
    this_mouse_handler,
    this_customize_desktop_menu,
    this_desktop_menucmd_handler,
};

SetCustomDesktopOperationSet(&this_dsk_ops);

See also

DESKTOPOPS