JPG图像与BMP相互转换工具源代码

//----------------------------------------------------------------------------- // Picture (Implementations) Version 1.00 // // Routins 4 Showing Picture Files... (.BMP .DIB .EMF .GIF .ICO .JPG .WMF) // // Author: Dr. Yovav Gad, EMail: Sources@SuperMain.com ,Web: www.SuperMain.com //============================================================================= // // Full Story: // ~~~~~~~~~~~ // There R Many Libraries To Handle Image Files, Anyway Most Of Them Do Not // Include Source Files Or Just Very Complicated To Implement / Understand, // // After Many Days Of Searching (And Not Finding) a Way To Load a JPG From a // Resource And Show It On a *Dialog Based* Application, I Decided 2 Take Steps // // So I Created What I Call a Very *Simple* & Useful Class, // It Can Easily Implemented By Adding It To a Project, And U Do Not Have To // Be a Real JPEG Freak - And Invent All Header Reading From The Beginning // (It Uses The IPicture Interface - Same Way As Internet Explorer Does) // // I Would Like To Thank Mr.Peter Hendrix For His Wonderful Work // That I Found On: http://www.thecodeproject.com/bitmap/cpicture.asp // Which I Was Inspired And Got The IPicture Interface Idea From... // // Guess U Will Find It Useful, // Appreciate If U Can Mention My Name On Your Final Code, // Please Feel Free To Send Me Any Improvements Or SaveAsJPG() Functions: // // (This Program Has No Bugs - Only Undocumented Solutions) // // Author: Dr. Yovav Gad, EMail: Sources@SuperMain.com ,Web: www.SuperMain.com // //--------------------------Example & Usage 4 Dummies-------------------------- // // U Need 2 Add "CPicture.CPP" and "CPicture.H" Into Your Project (From FileView) // So U Will Get Control Over The Functions In This Class, // Then U Can Create a Picture Object And Show It On a Device Context // // CPicture m_Picture; // Create a Picture Object (An Instance Of This Class) // #include "Picture.h" // Make Sure U Include This Where U Gonna Create The Object... // // Load Picture Data Into The IPicture Interface (.BMP .DIB .EMF .GIF .ICO .JPG .WMF) // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // m_Picture.Load("Test.JPG"); // Load From a File - Just Load It (Show Later) // m_Picture.Load(IDR_TEST, "JPG"); // Load From a Resource - Just Load It (Show Later) // (U Must Include IDR_TEST In Your Resources Under a Custom Name, 4 Example - "JPG") // // When Using DC Object On a *Dialog Based* Application (CPaintDC dc(this);) // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // m_Picture.UpdateSizeOnDC(&dc); // Get Picture Dimentions In Pixels // m_Picture.Show(&dc, CPoint(0,0), CPoint(m_Picture.m_Width, m_Picture.m_Height), 0,0); // m_Picture.Show(&dc, CRect(0,0,100,100)); // Change Original Dimentions // m_Picture.ShowBitmapResource(&dc, IDB_TEST, CPoint(0,0)); // Show Bitmap Resource // // OR When Using a Pointer On a "Regular" MFC Application (CDC* pDC) // ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ // m_Picture.UpdateSizeOnDC(pDC); // Get Picture Dimentions In Pixels // m_Picture.Show(pDC, CPoint(0,0), CPoint(m_Picture.m_Width, m_Picture.m_Height), 0,0); // m_Picture.Show(pDC, CRect(0,0,100,100)); // Change Original Dimentions // m_Picture.ShowBitmapResource(pDC, IDB_TEST, CPoint(0,0)); // Show Bitmap Resource // // Show Picture Information // ~~~~~~~~~~~~~~~~~~~~~~~~ // CString S; // S.Format("Size = %4d\nWidth = %4d\nHeight = %4d\nWeight = %4d\n", // m_Picture.m_Weight, m_Picture.m_Width, m_Picture.m_Height, m_Picture.m_Weight); // AfxMessageBox(S); // //----------------------------Cut The Bullshit Here---------------------------- #include "stdafx.h" #include "Picture.h" #ifdef _DEBUG #define new DEBUG_NEW #undef THIS_FILE static char THIS_FILE[] = __FILE__; #endif #define HIMETRIC_INCH 2540 #define ERROR_TITLE "CPicture Error" // Error Title (Related To This Class)... //----------------------------------------------------------------------------- // Does: Constructor - Create a New CPicture Object To Hold Picture Data // ~~~~ // //----------------------------------------------------------------------------- CPicture::CPicture() //============================================================================= { m_IPicture = NULL; m_Height = 0; m_Weight = 0; m_Width = 0; } //----------------------------------------------------------------------------- // Does: Destructor - Free Data And Information From The CPicture Object // ~~~~ // //----------------------------------------------------------------------------- CPicture::~CPicture() //============================================================================= { if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks... } //----------------------------------------------------------------------------- // Does: Free The Allocated Memory That Holdes The IPicture Interface Data // ~~~~ And Clear Picture Information // // Note: This Might Also Be Useful If U Only Need To Show The Picture Once // ~~~~~ Or If U Copy The Picture To The Device Context, So It Can Still // Remain On Screen - But IPicture Data Is Not Needed No More // //----------------------------------------------------------------------------- void CPicture::FreePictureData() //============================================================================= { if(m_IPicture != NULL) { m_IPicture->Release(); m_IPicture = NULL; m_Height = 0; m_Weight = 0; m_Width = 0; } } //----------------------------------------------------------------------------- // Does: Open a Resource And Load It Into IPicture (Interface) // ~~~~ (.BMP .DIB .EMF .GIF .ICO .JPG .WMF) // // Note: When Adding a Bitmap Resource It Would Automatically Show On "Bitmap" // ~~~~ This NOT Good Coz We Need To Load It From a Custom Resource "BMP" // To Add a Custom Rresource: Import Resource -> Open As -> Custom // (Both .BMP And .DIB Should Be Found Under "BMP") // // InPut: ResourceName - As a UINT Defined (Example: IDR_PICTURE_RESOURCE) // ~~~~~ ResourceType - Type Name (Example: "JPG") // // OutPut: TRUE If Succeeded... // ~~~~~~ //----------------------------------------------------------------------------- BOOL CPicture::Load(UINT ResourceName, LPCSTR ResourceType) //============================================================================= { BOOL bResult = FALSE; HGLOBAL hGlobal = NULL; HRSRC hSource = NULL; LPVOID lpVoid = NULL; int nSize = 0; if(m_IPicture != NULL) FreePictureData(); // Important - Avoid Leaks... hSource = FindResource(AfxGetResourceHandle(), MAKEINTRESOURCE(ResourceName), ResourceType); if(hSource == NULL) { HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd; MessageBoxEx(hWnd, "FindResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH); return(FALSE); } hGlobal = LoadResource(AfxGetResourceHandle(), hSource); if(hGlobal == NULL) { HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd; MessageBoxEx(hWnd, "LoadResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH); return(FALSE); } lpVoid = LockResource(hGlobal); if(lpVoid == NULL) { HWND hWnd = AfxGetApp()->GetMainWnd()->m_hWnd; MessageBoxEx(hWnd, "LockResource() Failed\t", ERROR_TITLE, MB_OK | MB_ICONSTOP, LANG_ENGLISH); return(FALSE); } nSize = (UINT)SizeofResource(AfxGetResourceHandle(), hSource); if(LoadPictureData((BYTE*)hGlobal, nSize)) bResult = TRUE; UnlockResource(hGlobal); // 16Bit Windows Needs This FreeResource(hGlobal); // 16Bit Windows Needs This (32Bit - Automatic Release) m_Weight = nSize; // Update Picture Size Info... if(m_IPicture != NULL) // Do Not Try To Read From Memory That Is Not Exist... { m_IPicture->get_Height(&m_Height);