使用CxImage进行图形和格式转换(CBitmap to jpg or png or gif or bmp)

CxImage类库介绍

CxImage类库是一个几乎可以管理所有的图象文件的C++类库。它可以快捷地存取、显示、转换各种图像。

其他的图形库？有那么多优秀的图形库，如OpenIL,FreeImage,PaintLib等等，它们是功能强大，齐全，而且是经常更新的。然而，如果你要使用他们，你可能会遇到一些麻烦，，因为它们大部分是平台无关的，用C语言写成，有的还夹杂着基本的C++ wrapper和大量的编译选项的声明需要你去处理。现在，一个新的GDI+类库来了，或许CxImage不是最有用的，但是至少你是有源代码的。这个类库不是MFC类库，完全是一个windows类库，因为一些特殊的构造和绘图函数，但是基础是平台无关的。

一.在你的程序中使用CxImage(Using MFC in Shared DLL + Debug 模式)

1.下载CxImage类库

地址：http://www.xdp.it/download.htm

http://www.codeproject.com/bitmap/cximage.asp

下载Download full source files (full) - 2.10 Mb

2.解压压缩包，并编译Demo2/Console.dsw，这个过程可能比较慢，中间文件为60M

3.编译完成后搜索*.lib文件，一共搜索出10个文件，把它们复制到你的工程目录中(任意)

它们分别为：CxImage.lib Jpeg.lib png.lib Tiff.lib jbig.lib zlib.lib j2k.lib cximagecrtd.lib(最后一个为静态MFC库时使用)

4.找到压缩包中的CxImage文件夹，把它里面的所有.h头文件，复制到你的工程目录中(任意)

5.在StdAfx.h文件中,添加这些文件

// 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

//添加CxImage到你的程序中(目录为你上面添加位置,我把它们放在了lib文件夹中了)
#include "lib/ximage.h"
//#pragma comment(lib,"lib/cximagecrtd.lib") //静态链接库时使用
#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.这样就可以在你的程序中使用CxImage类了

7.演示程序

void CTestDlg::OnButton1()
{
// TODO: Add your control notification handler code here

//取得你的图片资源文件IDB_BITMAP1
HBITMAP bitmap = ::LoadBitmap(AfxGetInstanceHandle(),
MAKEINTRESOURCE(IDB_BITMAP1));

//创建对象
CxImage *newImage = new CxImage();
newImage->CreateFromHBITMAP(bitmap);

//存储为文件,我发现的可以使用的有6个格式有三个格式未使用成功(gif,wbmg,wmf)....够用了吧?
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,只能读取第一贞图片?
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); //默认-未打开此项功能
newImage->Save("image.jbig",CXIMAGE_FORMAT_JBG); //默认-未打开此项功能
/*
* CxImage配置文件ximacfg.h
* #define CXIMAGE_SUPPORT_BMP 1 //可用状态(即不可取得和转换成这种格式)
* #define CXIMAGE_SUPPORT_MNG 0 //不可用状态
*/
}

其他说明

1.所支持的格式(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.格式转换示例

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....也没按这个弄好过...不知道为什么

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.解压压缩包,打开Demo2/Console.dsw，设置如下:

Project -> Setting -> Using MFC in a Static Library(注意是所有的项目都设置成这个)

2.确保c/c++ -> Code Generation -> Using run-time library 为 Mutithreaded

3.Debug模式下编译,搜索*.lib文件,复制到工程目录,包含进工程(当前工程也必须是Using MFC in a Static Library + Debug 模式),即可,包含方法同上

注意:生成的LIB文件,比上面要少一个....不知道为什么...少了consoled.lib,但并无大碍,不包含它即可

三.使用CxImage(Using MFC in a Static Library + Realese 模式)

1.解压压缩包,打开Demo2/Console.dsw，设置如下:

Project -> Setting -> Using MFC in a Static Library(注意是所有的项目都设置成这个)

2.确保c/c++ -> Code Generation -> Using run-time library 为 Mutithreaded

3.Realese模式下编译,搜索*.lib文件,复制到工程目录,包含进工程(当前工程也必须是Using MFC in a Static Library + Realese模式),即可,包含方法同上

注意:生成的LIB文件,同样是少一个,不包含它即可

参考:

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