jpegviewer.cpp

this source code is jpeg-viewer in ce5.0 it need to COM, JPG DECODER in pb5.0

// JpegViewer.cpp : Defines the entry point for the application.
//

#include "stdafx.h"
#include "JpegViewer.h"
#include <windows.h>
#include <commctrl.h>

// Added By Justin
#include <initguid.h>
#include <imaging.h>
#pragma comment (lib, "Ole32.lib")

#define MAX_LOADSTRING 100

// Global Variables:
HINSTANCE			g_hInst;			// current instance
HWND				g_hWndCommandBar;	// command bar handle

// Forward declarations of functions included in this code module:
ATOM			MyRegisterClass(HINSTANCE, LPTSTR);
BOOL			InitInstance(HINSTANCE, int);
LRESULT CALLBACK	WndProc(HWND, UINT, WPARAM, LPARAM);

//Added By Justin
void DrawImageFile(HWND hWnd);

int WINAPI WinMain(HINSTANCE hInstance,
                   HINSTANCE hPrevInstance,
                   LPTSTR    lpCmdLine,
                   int       nCmdShow)
{
	MSG msg;

	// Perform application initialization:
	if (!InitInstance(hInstance, nCmdShow)) 
	{
		return FALSE;
	}

	HACCEL hAccelTable;
	hAccelTable = LoadAccelerators(hInstance, MAKEINTRESOURCE(IDC_JPEGVIEWER));

	// Main message loop:
	while (GetMessage(&msg, NULL, 0, 0)) 
	{
		if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) 
		{
			TranslateMessage(&msg);
			DispatchMessage(&msg);
		}
	}

	return (int) msg.wParam;
}

//
//  FUNCTION: MyRegisterClass()
//
//  PURPOSE: Registers the window class.
//
//  COMMENTS:
//
ATOM MyRegisterClass(HINSTANCE hInstance, LPTSTR szWindowClass)
{
	WNDCLASS wc;

	wc.style         = CS_HREDRAW | CS_VREDRAW;
	wc.lpfnWndProc   = WndProc;
	wc.cbClsExtra    = 0;
	wc.cbWndExtra    = 0;
	wc.hInstance     = hInstance;
	wc.hIcon         = LoadIcon(hInstance, MAKEINTRESOURCE(IDI_JPEGVIEWER));
	wc.hCursor       = 0;
	wc.hbrBackground = (HBRUSH) GetStockObject(WHITE_BRUSH);
	wc.lpszMenuName  = 0;
	wc.lpszClassName = szWindowClass;

	return RegisterClass(&wc);
}

//
//   FUNCTION: InitInstance(HINSTANCE, int)
//
//   PURPOSE: Saves instance handle and creates main window
//
//   COMMENTS:
//
//        In this function, we save the instance handle in a global variable and
//        create and display the main program window.
//
BOOL InitInstance(HINSTANCE hInstance, int nCmdShow)
{
    HWND hWnd;
    TCHAR szTitle[MAX_LOADSTRING];		// title bar text
    TCHAR szWindowClass[MAX_LOADSTRING];	// main window class name

    g_hInst = hInstance; // Store instance handle in our global variable


    LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); 
    LoadString(hInstance, IDC_JPEGVIEWER, szWindowClass, MAX_LOADSTRING);


    if (!MyRegisterClass(hInstance, szWindowClass))
    {
    	return FALSE;
    }

    hWnd = CreateWindow(szWindowClass, szTitle, WS_VISIBLE,
        CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, CW_USEDEFAULT, NULL, NULL, hInstance, NULL);

    if (!hWnd)
    {
        return FALSE;
    }


    ShowWindow(hWnd, nCmdShow);
    UpdateWindow(hWnd);

    if (g_hWndCommandBar)
    {
        CommandBar_Show(g_hWndCommandBar, TRUE);
    }

    return TRUE;
}

//
//  FUNCTION: WndProc(HWND, UINT, WPARAM, LPARAM)
//
//  PURPOSE:  Processes messages for the main window.
//
//  WM_COMMAND	- process the application menu
//  WM_PAINT	- Paint the main window
//  WM_DESTROY	- post a quit message and return
//
//
LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    int wmId, wmEvent;
    PAINTSTRUCT ps;
    HDC hdc;

    switch (message) 
    {
        case WM_COMMAND:
            wmId    = LOWORD(wParam); 
            wmEvent = HIWORD(wParam); 
            // Parse the menu selections:
            switch (wmId)
            {
                case IDM_FILE_EXIT:
                    DestroyWindow(hWnd);
                    break;
				case IDM_JPEG_LOAD:
					DrawImageFile(hWnd);
					break;
                default:
                    return DefWindowProc(hWnd, message, wParam, lParam);
            }
            break;
        case WM_CREATE:
            g_hWndCommandBar = CommandBar_Create(g_hInst, hWnd, 1);
            CommandBar_InsertMenubar(g_hWndCommandBar, g_hInst, IDR_MENU, 0);
            CommandBar_AddAdornments(g_hWndCommandBar, 0, 0);
            break;
        case WM_PAINT:
            hdc = BeginPaint(hWnd, &ps);
            
            // TODO: Add any drawing code here...
           
            EndPaint(hWnd, &ps);
            break;
        case WM_DESTROY:
            CommandBar_Destroy(g_hWndCommandBar);
            PostQuitMessage(0);
            break;


        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}


void DrawImageFile(HWND hWnd)

{
    HRESULT hr;
	TCHAR* szFileName=L"\\medc.jpg";
	RECT rcDest = {0,0,500,660};
	HDC hdc = GetDC(hWnd);

	hr = CoInitializeEx(NULL, COINIT_MULTITHREADED);
    IImage *pImage = NULL;
    IImagingFactory *pImagingFactory = NULL;

	hr = CoCreateInstance(CLSID_ImagingFactory, 
                          NULL, 
                          CLSCTX_INPROC_SERVER, 
                          IID_IImagingFactory, 
                          (void**) &pImagingFactory);

	if (FAILED(hr)) 
		goto finish;

    hr = pImagingFactory->CreateImageFromFile(szFileName, &pImage);

    if (FAILED(hr) || pImage == NULL)   
		goto finish;

    pImage->Draw(hdc, &rcDest, NULL);
    pImage->Release();

finish:
    if (pImage)                 
		pImage->Release();
    if (pImagingFactory)    
		pImagingFactory->Release();

	CoUninitialize();    
}