使用CxImage進行圖形和格式轉換(CBitmap to jpg or png or gif or bmp)
CxImage類庫介紹
CxImage類庫是一個幾乎可以管理所有的圖象檔案的C++類庫。它可以快捷地存取、顯示、轉換各種影象。
其他的圖形庫？有那麼多優秀的圖形庫，如OpenIL,FreeImage,PaintLib等等，它們是功能強大，齊全，而且是經常更新的。然而，如果你要使用他們，你可能會遇到一些麻煩，，因為它們大部分是平臺無關的，用C語言寫成，有的還夾雜著基本的C++ wrapper和大量的編譯選項的宣告需要你去處理。現在，一個新的GDI+類庫來了，或許CxImage不是最有用的，但是至少你是有原始碼的。這個類庫不是MFC類庫，完全是一個windows類庫，因為一些特殊的構造和繪圖函式，但是基礎是平臺無關的。
一.在你的程式中使用CxImage(Using MFC in Shared DLL + Debug 模式)
1.下載CxImage類庫
地址：http://www.xdp.it/download.htm
下載Download full source files (full) - 2.10 Mb
2.解壓壓縮包，並編譯Demo2/Console.dsw，這個過程可能比較慢，中間檔案為60M
3.編譯完成後搜尋*.lib檔案，一共搜尋出10個檔案，把它們複製到你的工程目錄中(任意)
它們分別為：CxImage.lib Jpeg.lib png.lib Tiff.lib jbig.lib zlib.lib j2k.lib cximagecrtd.lib(最後一個為靜態MFC庫時使用)
4.找到壓縮包中的CxImage資料夾，把它裡面的所有.h標頭檔案，複製到你的工程目錄中(任意)
5.在StdAfx.h檔案中,新增這些檔案
- // stdafx.h : include file for standard system include files,
- // or project specific include files that are used frequently, but
- // are changed infrequently
- //
- #if !defined(AFX_STDAFX_H__84F27293_E63B_443C_BA35_5322307D48DA__INCLUDED_)
- #define AFX_STDAFX_H__84F27293_E63B_443C_BA35_5322307D48DA__INCLUDED_
- #if _MSC_VER > 1000
- #pragma once
- #endif // _MSC_VER > 1000
- #define VC_EXTRALEAN // Exclude rarely-used stuff from Windows headers
- #include <afxwin> // MFC core and standard components
- #include <afxext> // MFC extensions
- #include <afxdisp> // MFC Automation classes
- #include <afxdtctl> // MFC support for Internet Explorer 4 Common Controls
- #ifndef _AFX_NO_AFXCMN_SUPPORT
- #include <afxcmn> // MFC support for Windows Common Controls
- #endif // _AFX_NO_AFXCMN_SUPPORT
- //新增CxImage到你的程式中(目錄為你上面新增位置,我把它們放在了lib資料夾中了)
- #include "lib/ximage.h"
- //#pragma comment(lib,"lib/cximagecrtd.lib") //靜態連結庫時使用
- #pragma comment(lib,"lib/cximage.lib")
- #pragma comment(lib,"lib/Jpeg.lib")
- #pragma comment(lib,"lib/consoled.lib")
- #pragma comment(lib,"lib/png.lib")
- #pragma comment(lib,"lib/zlib.lib")
- #pragma comment(lib,"lib/tiff.lib")
- #pragma comment(lib,"lib/jasper.lib")
- #pragma comment(lib,"lib/j2k.lib")
- #pragma comment(lib,"lib/jbig.lib")
- //{{AFX_INSERT_LOCATION}}
- // Microsoft Visual C++ will insert additional declarations immediately before the previous line.
- #endif // !defined(AFX_STDAFX_H__84F27293_E63B_443C_BA35_5322307D48DA__INCLUDED_)
6.這樣就可以在你的程式中使用CxImage類了
7.演示程式
- void CTestDlg::OnButton1()
- {
- // TODO: Add your control notification handler code here
- //取得你的圖片資原始檔IDB_BITMAP1
- HBITMAP bitmap = ::LoadBitmap(AfxGetInstanceHandle(),
- MAKEINTRESOURCE(IDB_BITMAP1));
- //建立物件
- CxImage *newImage = new CxImage();
- newImage->CreateFromHBITMAP(bitmap);
- //儲存為檔案,我發現的可以使用的有6個格式有三個格式未使用成功(gif,wbmg,wmf)....夠用了吧?
- newImage->Save("image.bmp",CXIMAGE_FORMAT_BMP); //注意不是CXIMAGE_SUPPORT_BMP
- newImage->Save("image.tga",CXIMAGE_FORMAT_TGA);
- newImage->Save("image.pcx",CXIMAGE_FORMAT_PCX);
- newImage->Save("image.jpg",CXIMAGE_FORMAT_JPG);
- newImage->Save("image.png",CXIMAGE_FORMAT_PNG);
- newImage->Save("image.tiff",CXIMAGE_FORMAT_TIF);
- newImage->Save("image.gif",CXIMAGE_FORMAT_GIF); //不成功,只能讀取第一貞圖片?
- newImage->Save("image.wbmp",CXIMAGE_FORMAT_WBMP); //不成功
- newImage->Save("image.wmf",CXIMAGE_FORMAT_WMF); //不成功
- newImage->Save("image.mng",CXIMAGE_FORMAT_MNG); //預設-未開啟此項功能
- newImage->Save("image.jbig",CXIMAGE_FORMAT_JBG); //預設-未開啟此項功能
- /*
- * CxImage配置檔案ximacfg.h
- * #define CXIMAGE_SUPPORT_BMP 1 //可用狀態(即不可取得和轉換成這種格式)
- * #define CXIMAGE_SUPPORT_MNG 0 //不可用狀態
- */
- }
其他說明
1.所支援的格式(in Doc)
formats #define required libraries size [Kbyte] BMP
GIF
ICO
TGA
PCX
WBMP
WMF CXIMAGE_SUPPORT_BMP
CXIMAGE_SUPPORT_GIF
CXIMAGE_SUPPORT_ICO
CXIMAGE_SUPPORT_TGA
CXIMAGE_SUPPORT_PCX
CXIMAGE_SUPPORT_WBMP
CXIMAGE_SUPPORT_WMF
built in
24 JPEG CXIMAGE_SUPPORT_JPG
jpeg
88 PNG CXIMAGE_SUPPORT_PNG
png, zlib
104 MNG CXIMAGE_SUPPORT_MNG
mng, zlib, jpeg
148 TIFF CXIMAGE_SUPPORT_TIF
tiff, zlib, jpeg
124 JBIG CXIMAGE_SUPPORT_JBG
jbig
28 PNM,PPM,PGM
RAS CXIMAGE_SUPPORT_PNM
CXIMAGE_SUPPORT_RAS
jasper
176 JPEG-2000 CXIMAGE_SUPPORT_JP2
CXIMAGE_SUPPORT_JPC
CXIMAGE_SUPPORT_PGX
jasper
176
2.格式轉換示例
- CxImage image;
- // bmp -> jpg
- image.Load("image.bmp", CXIMAGE_FORMAT_BMP);
- if (image.IsValid()){
- if(!image.IsGrayScale()) image.IncreaseBpp(24);
- image.SetJpegQuality(99);
- image.Save("image.jpg",CXIMAGE_FORMAT_JPG);
- }
- // png -> tif
- image.Load("image.png", CXIMAGE_FORMAT_PNG);
- if (image.IsValid()){
- image.Save("image.tif",CXIMAGE_FORMAT_TIF);
- }
3.使用CxImage(In Doc),至今未弄懂....也沒按這個弄好過...不知道為什麼
- Project Settings
- |- C/C++
- | |- Code Generation
- | | |- Use run-time library : Multithreaded DLL (must be the same for
- | | | all the linked libraries)
- | | |- Struct member alignment : must be the same for all the linked
- | | | libraries
- | |- Precompiled headers : not using precompiled headers
- | |- Preprocessor
- | |- Additional Include Directories: ..cximage
- |- Link
- |- General
- |- Object/library modules: ../png/Debug/png.lib
- ../jpeg/Debug/jpeg.lib
- ../zlib/Debug/zlib.lib
- ../tiff/Debug/tiff.lib
- ../jasper/Debug/jasper.lib
- ../cximage/Debug/cximage.lib ...
二.使用CxImage(Using MFC in a Static Library + Debug 模式)
1.解壓壓縮包,開啟Demo2/Console.dsw，設定如下:
Project -> Setting -> Using MFC in a Static Library(注意是所有的專案都設定成這個)
2.確保c/c++ -> Code Generation -> Using run-time library 為 Mutithreaded
3.Debug模式下編譯,搜尋*.lib檔案,複製到工程目錄,包含進工程(當前工程也必須是Using MFC in a Static Library + Debug 模式),即可,包含方法同上
注意:生成的LIB檔案,比上面要少一個....不知道為什麼...少了consoled.lib,但並無大礙,不包含它即可
三.使用CxImage(Using MFC in a Static Library + Realese 模式)
1.解壓壓縮包,開啟Demo2/Console.dsw，設定如下:
Project -> Setting -> Using MFC in a Static Library(注意是所有的專案都設定成這個)
2.確保c/c++ -> Code Generation -> Using run-time library 為 Mutithreaded
3.Realese模式下編譯,搜尋*.lib檔案,複製到工程目錄,包含進工程(當前工程也必須是Using MFC in a Static Library + Realese模式),即可,包含方法同上
注意:生成的LIB檔案,同樣是少一個,不包含它即可
參考:
Open the CxImage workspace with all the libraries. Select Project->Properties. Select each project in the list and make sure they all have the same settings for the MFC library (Not Using MFC for a static library). Then select the C/C++ tab and select Code
Generation in the combo box. In the Use Run-time Library combo box, make sure all of them are set to Single-Threaded (or multi threaded depending on your settings). Then remake all the libraries and try to recompile your project
Thanks Kelly. It works! Thanks again!:) It turns out that CxImage static lib projects, in my case, are not set uniformly the same; some uses MFC shared library while some uses MFC static library