view GIF in C++

// ****************************************************************************
//
// GIFVIEW.CPP
//
//   This sample file demonstrates how to load an animated GIF and a BMP file
// in Windows using the Winimage library.
//
// You should compile & link this file together with:
//  WINIMAGE.CPP: Generic classes for raster images (MSWindows specialization)
//
// ----------------------------------------------------------------------------
//
// Copyright © 2000, Juan Soulie <[email protected]>
//
// Permission to use, copy, modify, distribute and sell this software or any
// part thereof and/or its documentation for any purpose is granted without fee
// provided that the above copyright notice and this permission notice appear
// in all copies.
//
// This software is provided "as is" without express or implied warranty of
// any kind. The author shall have no liability with respect to the
// infringement of copyrights or patents that any modification to the content
// of this file or this file itself may incur.
//
// ****************************************************************************

#include <windows.h>
#include "winimage.h"

char szAppName[]="GIF/BMP Loader Example";

LRESULT CALLBACK WndProc (HWND,UINT,WPARAM,LPARAM);

// WinMain (Windows application main function)
int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
					PSTR szCmdLine, int iCmdShow)
{
	HWND hwnd;
	MSG msg;
	WNDCLASSEX wndclass;

	// Register the Main Window Class:
	wndclass.cbSize=sizeof (wndclass);
	wndclass.style=CS_HREDRAW|CS_VREDRAW;
	wndclass.lpfnWndProc=WndProc;
	wndclass.cbClsExtra=0;
	wndclass.cbWndExtra=0;
	wndclass.hInstance=hInstance;
	wndclass.hIcon=LoadIcon (NULL,IDI_APPLICATION);
	wndclass.hCursor=LoadCursor (NULL,IDC_ARROW);
	wndclass.hbrBackground=(HBRUSH) (COLOR_WINDOW);
	wndclass.lpszMenuName=NULL;
	wndclass.lpszClassName=szAppName;
	wndclass.hIconSm=LoadIcon (NULL,IDI_APPLICATION);

	RegisterClassEx (&wndclass);

	// Create and Show the Main Window
	hwnd=CreateWindow (szAppName,szAppName,
					WS_OVERLAPPEDWINDOW,
					CW_USEDEFAULT,CW_USEDEFAULT,
					CW_USEDEFAULT,CW_USEDEFAULT,
					NULL,NULL,hInstance,NULL);
	ShowWindow (hwnd,iCmdShow);
	UpdateWindow (hwnd);

	// Message Loop
	while (GetMessage (&msg,NULL,0,0))
	{
		TranslateMessage (&msg);
		DispatchMessage (&msg);
	}

	// End Application
	return msg.wParam;
}

// WndProc (Main window procedure - Message Processor)
LRESULT CALLBACK WndProc (HWND hwnd,UINT iMsg,WPARAM wParam,LPARAM lParam)
{
	static C_Image img;
	static C_ImageSet imgset;
	static C_AnimationWindow anim, anim2, anim3;
	switch (iMsg)
	{
	case WM_CREATE:
		// Load Image files
		img.LoadBMP ("logo.bmp");
		imgset.LoadGIF ("sample.gif");
		// Create 3 Animation Child Windows of the same C_ImageSet object:
		// Notice how each one uses its own thread and can be
		// paused independently (left-clicking)
		anim.Create (hwnd,(HMENU)1000,&imgset);
		anim2.Create (hwnd,(HMENU)1001,&imgset);
		anim3.Create (hwnd,(HMENU)1002,&imgset);

		return 0;
	case WM_SIZE:
		// Display and Set position of Animation Child Windows (GIF file):
		anim.Display (10,10);
		anim2.Display (110,10);
		anim3.Display (210,10);
		return 0;
	case WM_PAINT:
		// Paint the img object (BMP file):
		HDC hdc;
		PAINTSTRUCT ps;
		hdc=BeginPaint (hwnd,&ps);
		img.GDIPaint (hdc,10,100);
		EndPaint (hwnd,&ps);
		return 0;
	case WM_DESTROY:
		PostQuitMessage (0);
		return 0;
	}
	return DefWindowProc (hwnd,iMsg,wParam,lParam);
}