一、库的编译

1、下载 libjpeg 源码，这里我下载的是 jpegsr9e.zip

2、解压源码

3、进入解压后的目录，找到 makefile.vs 文件,用文本编辑器打开并编辑，找到语句

#!include <win32.mak>

所在行，并将 win32.mak 替换为实际位置, 我这边修改后的值为

!include <C:\Program Files (x86)\Microsoft SDKs\Windows\v7.1A\Include\win32.mak>

4、在文件中查找关键字 “setup”，这个是我们后面生成vs 工程文件要用到的，我这边带有关键字“setup” 的有

setup-vc6:
setupcopy-vc6:
setup-v16:
setupcopy-v16:
setup-v17:
setupcopy-v17:

上面的 setup-vc6 就表示 vc++ 6.0 编译器

setup-vc16 就表示 vs2019 编译器，后面的以此类推，自己是什么编译器就对应那个关键句

5、生成 sln 工程文件:在电脑的 “开始”菜单中，找到 vs2019的命令行工具，并打开，我这里是

x86 Native Tools Command Prompt for VS 2019

打开后，会出来一个命令行界面，在里面进入 libjeg 源码所在目录，并输入一下命令来生成vs 的工程文件

NMAKE /f makefile.vc setup-v16

如果提示找不到 jconfig.h文件的话，就复制一份 jconfig.vc 改名成 jconfig.h

而后，继续执行上面的nmake命令

执行成功后，会在当前目录下生成一个 .sln 的工程文件，打开这个 sln 文件，正常编译即可，默认是编译静态库，编译出来是一个 jpeg.lib 文件。

二、编译动态库

1、在上一步的基础上，在工程中新建c++ 头文件 jexport.h，里面输入的内容如下

#pragma once#if defined(_WIN32)
#  if defined(LIBJPEG_STATIC)
#    define LIBJPEG_EXPORT_API
#  else
#    if defined(LIBJPEG_EXPORTS)
#      define LIBJPEG_EXPORT_API __declspec(dllexport)
#    else
#      define LIBJPEG_EXPORT_API __declspec(dllimport)
#    endif
#  endif
#else
#  define LIBJPEG_EXPORT_API
#endif

2、修改 jmorecfg.h 文件:

在文件开始处添加 jexport.h 的引用, 找到语句

#define EXTERN(type)

并修改为

#define EXTERN(type)       extern LIBJPEG_EXPORT_API type

我这边修改后的文件为

/** jmorecfg.h** Copyright (C) 1991-1997, Thomas G. Lane.* Modified 1997-2013 by Guido Vollbeding.* This file is part of the Independent JPEG Group's software.* For conditions of distribution and use, see the accompanying README file.** This file contains additional configuration options that customize the* JPEG software for special applications or support machine-dependent* optimizations.  Most users will not need to touch this file.*/
#include "jexport.h"/** Define BITS_IN_JSAMPLE as either*   8   for 8-bit sample values (the usual setting)*   9   for 9-bit sample values*   10  for 10-bit sample values*   11  for 11-bit sample values*   12  for 12-bit sample values* Only 8, 9, 10, 11, and 12 bits sample data precision are supported for* full-feature DCT processing.  Further depths up to 16-bit may be added* later for the lossless modes of operation.* Run-time selection and conversion of data precision will be added later* and are currently not supported, sorry.* Exception:  The transcoding part (jpegtran) supports all settings in a* single instance, since it operates on the level of DCT coefficients and* not sample values.  The DCT coefficients are of the same type (16 bits)* in all cases (see below).*/#define BITS_IN_JSAMPLE  8 /* use 8, 9, 10, 11, or 12 *//** Maximum number of components (color channels) allowed in JPEG image.* To meet the letter of the JPEG spec, set this to 255.  However, darn* few applications need more than 4 channels (maybe 5 for CMYK + alpha* mask).  We recommend 10 as a reasonable compromise; use 4 if you are* really short on memory.  (Each allowed component costs a hundred or so* bytes of storage, whether actually used in an image or not.)*/#define MAX_COMPONENTS  10  /* maximum number of image components *//** Basic data types.* You may need to change these if you have a machine with unusual data* type sizes; for example, "char" not 8 bits, "short" not 16 bits,* or "long" not 32 bits.  We don't care whether "int" is 16 or 32 bits,* but it had better be at least 16.*//* Representation of a single sample (pixel element value).* We frequently allocate large arrays of these, so it's important to keep* them small.  But if you have memory to burn and access to char or short* arrays is very slow on your hardware, you might want to change these.*/#if BITS_IN_JSAMPLE == 8
/* JSAMPLE should be the smallest type that will hold the values 0..255.* You can use a signed char by having GETJSAMPLE mask it with 0xFF.*/#ifdef HAVE_UNSIGNED_CHARtypedef unsigned char JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))#else /* not HAVE_UNSIGNED_CHAR */typedef char JSAMPLE;
#ifdef CHAR_IS_UNSIGNED
#define GETJSAMPLE(value)  ((int) (value))
#else
#define GETJSAMPLE(value)  ((int) (value) & 0xFF)
#endif /* CHAR_IS_UNSIGNED */#endif /* HAVE_UNSIGNED_CHAR */#define MAXJSAMPLE  255
#define CENTERJSAMPLE   128#endif /* BITS_IN_JSAMPLE == 8 */#if BITS_IN_JSAMPLE == 9
/* JSAMPLE should be the smallest type that will hold the values 0..511.* On nearly all machines "short" will do nicely.*/typedef short JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))#define MAXJSAMPLE    511
#define CENTERJSAMPLE   256#endif /* BITS_IN_JSAMPLE == 9 */#if BITS_IN_JSAMPLE == 10
/* JSAMPLE should be the smallest type that will hold the values 0..1023.* On nearly all machines "short" will do nicely.*/typedef short JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))#define MAXJSAMPLE    1023
#define CENTERJSAMPLE   512#endif /* BITS_IN_JSAMPLE == 10 */#if BITS_IN_JSAMPLE == 11
/* JSAMPLE should be the smallest type that will hold the values 0..2047.* On nearly all machines "short" will do nicely.*/typedef short JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))#define MAXJSAMPLE    2047
#define CENTERJSAMPLE   1024#endif /* BITS_IN_JSAMPLE == 11 */#if BITS_IN_JSAMPLE == 12
/* JSAMPLE should be the smallest type that will hold the values 0..4095.* On nearly all machines "short" will do nicely.*/typedef short JSAMPLE;
#define GETJSAMPLE(value)  ((int) (value))#define MAXJSAMPLE    4095
#define CENTERJSAMPLE   2048#endif /* BITS_IN_JSAMPLE == 12 *//* Representation of a DCT frequency coefficient.* This should be a signed value of at least 16 bits; "short" is usually OK.* Again, we allocate large arrays of these, but you can change to int* if you have memory to burn and "short" is really slow.*/typedef short JCOEF;/* Compressed datastreams are represented as arrays of JOCTET.* These must be EXACTLY 8 bits wide, at least once they are written to* external storage.  Note that when using the stdio data source/destination* managers, this is also the data type passed to fread/fwrite.*/#ifdef HAVE_UNSIGNED_CHARtypedef unsigned char JOCTET;
#define GETJOCTET(value)  (value)#else /* not HAVE_UNSIGNED_CHAR */typedef char JOCTET;
#ifdef CHAR_IS_UNSIGNED
#define GETJOCTET(value)  (value)
#else
#define GETJOCTET(value)  ((value) & 0xFF)
#endif /* CHAR_IS_UNSIGNED */#endif /* HAVE_UNSIGNED_CHAR *//* These typedefs are used for various table entries and so forth.* They must be at least as wide as specified; but making them too big* won't cost a huge amount of memory, so we don't provide special* extraction code like we did for JSAMPLE.  (In other words, these* typedefs live at a different point on the speed/space tradeoff curve.)*//* UINT8 must hold at least the values 0..255. */#ifdef HAVE_UNSIGNED_CHAR
typedef unsigned char UINT8;
#else /* not HAVE_UNSIGNED_CHAR */
#ifdef CHAR_IS_UNSIGNED
typedef char UINT8;
#else /* not CHAR_IS_UNSIGNED */
typedef short UINT8;
#endif /* CHAR_IS_UNSIGNED */
#endif /* HAVE_UNSIGNED_CHAR *//* UINT16 must hold at least the values 0..65535. */#ifdef HAVE_UNSIGNED_SHORT
typedef unsigned short UINT16;
#else /* not HAVE_UNSIGNED_SHORT */
typedef unsigned int UINT16;
#endif /* HAVE_UNSIGNED_SHORT *//* INT16 must hold at least the values -32768..32767. */#ifndef XMD_H           /* X11/xmd.h correctly defines INT16 */
typedef short INT16;
#endif/* INT32 must hold at least signed 32-bit values. */#ifndef XMD_H         /* X11/xmd.h correctly defines INT32 */
#ifndef _BASETSD_H_     /* Microsoft defines it in basetsd.h */
#ifndef _BASETSD_H      /* MinGW is slightly different */
#ifndef QGLOBAL_H       /* Qt defines it in qglobal.h */
typedef long INT32;
#endif
#endif
#endif
#endif/* Datatype used for image dimensions.  The JPEG standard only supports* images up to 64K*64K due to 16-bit fields in SOF markers.  Therefore* "unsigned int" is sufficient on all machines.  However, if you need to* handle larger images and you don't mind deviating from the spec, you* can change this datatype.*/typedef unsigned int JDIMENSION;#define JPEG_MAX_DIMENSION  65500L  /* a tad under 64K to prevent overflows *//* These macros are used in all function definitions and extern declarations.* You could modify them if you need to change function linkage conventions;* in particular, you'll need to do that to make the library a Windows DLL.* Another application is to make all functions global for use with debuggers* or code profilers that require it.*//* a function called through method pointers: */
#define METHODDEF(type)     static type
/* a function used only in its module: */
#define LOCAL(type)     static type
/* a function referenced thru EXTERNs: */
#define GLOBAL(type)        type
/* a reference to a GLOBAL function: */
//#define EXTERN(type)      extern type
#define EXTERN(type)       extern LIBJPEG_EXPORT_API type/* This macro is used to declare a "method", that is, a function pointer.* We want to supply prototype parameters if the compiler can cope.* Note that the arglist parameter must be parenthesized!* Again, you can customize this if you need special linkage keywords.*/#ifdef HAVE_PROTOTYPES
#define JMETHOD(type,methodname,arglist)  type (*methodname) arglist
#else
#define JMETHOD(type,methodname,arglist)  type (*methodname) ()
#endif/* The noreturn type identifier is used to declare functions* which cannot return.* Compilers can thus create more optimized code and perform* better checks for warnings and errors.* Static analyzer tools can make improved inferences about* execution paths and are prevented from giving false alerts.** Unfortunately, the proposed specifications of corresponding* extensions in the Dec 2011 ISO C standard revision (C11),* GCC, MSVC, etc. are not viable.* Thus we introduce a user defined type to declare noreturn* functions at least for clarity.  A proper compiler would* have a suitable noreturn type to match in place of void.*/#ifndef HAVE_NORETURN_T
typedef void noreturn_t;
#endif/* Here is the pseudo-keyword for declaring pointers that must be "far"* on 80x86 machines.  Most of the specialized coding for 80x86 is handled* by just saying "FAR *" where such a pointer is needed.  In a few places* explicit coding is needed; see uses of the NEED_FAR_POINTERS symbol.*/#ifndef FAR
#ifdef NEED_FAR_POINTERS
#define FAR  far
#else
#define FAR
#endif
#endif/** On a few systems, type boolean and/or its values FALSE, TRUE may appear* in standard header files.  Or you may have conflicts with application-* specific header files that you want to include together with these files.* Defining HAVE_BOOLEAN before including jpeglib.h should make it work.*/#ifndef HAVE_BOOLEAN
#if defined FALSE || defined TRUE || defined QGLOBAL_H
/* Qt3 defines FALSE and TRUE as "const" variables in qglobal.h */
typedef int boolean;
#ifndef FALSE           /* in case these macros already exist */
#define FALSE   0       /* values of boolean */
#endif
#ifndef TRUE
#define TRUE    1
#endif
#else
typedef enum { FALSE = 0, TRUE = 1 } boolean;
#endif
#endif/** The remaining options affect code selection within the JPEG library,* but they don't need to be visible to most applications using the library.* To minimize application namespace pollution, the symbols won't be* defined unless JPEG_INTERNALS or JPEG_INTERNAL_OPTIONS has been defined.*/#ifdef JPEG_INTERNALS
#define JPEG_INTERNAL_OPTIONS
#endif#ifdef JPEG_INTERNAL_OPTIONS/** These defines indicate whether to include various optional functions.* Undefining some of these symbols will produce a smaller but less capable* library.  Note that you can leave certain source files out of the* compilation/linking process if you've #undef'd the corresponding symbols.* (You may HAVE to do that if your compiler doesn't like null source files.)*//* Capability options common to encoder and decoder: */#define DCT_ISLOW_SUPPORTED  /* slow but accurate integer algorithm */
#define DCT_IFAST_SUPPORTED /* faster, less accurate integer method */
#define DCT_FLOAT_SUPPORTED /* floating-point: accurate, fast on fast HW *//* Encoder capability options: */#define C_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
#define C_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
#define C_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
#define DCT_SCALING_SUPPORTED       /* Input rescaling via DCT? (Requires DCT_ISLOW)*/
#define ENTROPY_OPT_SUPPORTED       /* Optimization of entropy coding parms? */
/* Note: if you selected more than 8-bit data precision, it is dangerous to* turn off ENTROPY_OPT_SUPPORTED.  The standard Huffman tables are only* good for 8-bit precision, so arithmetic coding is recommended for higher* precision.  The Huffman encoder normally uses entropy optimization to* compute usable tables for higher precision.  Otherwise, you'll have to* supply different default Huffman tables.* The exact same statements apply for progressive JPEG: the default tables* don't work for progressive mode.  (This may get fixed, however.)*/
#define INPUT_SMOOTHING_SUPPORTED   /* Input image smoothing option? *//* Decoder capability options: */#define D_ARITH_CODING_SUPPORTED    /* Arithmetic coding back end? */
#define D_MULTISCAN_FILES_SUPPORTED /* Multiple-scan JPEG files? */
#define D_PROGRESSIVE_SUPPORTED     /* Progressive JPEG? (Requires MULTISCAN)*/
#define IDCT_SCALING_SUPPORTED      /* Output rescaling via IDCT? (Requires DCT_ISLOW)*/
#define SAVE_MARKERS_SUPPORTED      /* jpeg_save_markers() needed? */
#define BLOCK_SMOOTHING_SUPPORTED   /* Block smoothing? (Progressive only) */
#undef  UPSAMPLE_SCALING_SUPPORTED  /* Output rescaling at upsample stage? */
#define UPSAMPLE_MERGING_SUPPORTED  /* Fast path for sloppy upsampling? */
#define QUANT_1PASS_SUPPORTED       /* 1-pass color quantization? */
#define QUANT_2PASS_SUPPORTED       /* 2-pass color quantization? *//* more capability options later, no doubt *//** Ordering of RGB data in scanlines passed to or from the application.* If your application wants to deal with data in the order B,G,R, just* change these macros.  You can also deal with formats such as R,G,B,X* (one extra byte per pixel) by changing RGB_PIXELSIZE.  Note that changing* the offsets will also change the order in which colormap data is organized.* RESTRICTIONS:* 1. The sample applications cjpeg,djpeg do NOT support modified RGB formats.* 2. The color quantizer modules will not behave desirably if RGB_PIXELSIZE*    is not 3 (they don't understand about dummy color components!).  So you*    can't use color quantization if you change that value.*/#define RGB_RED      0   /* Offset of Red in an RGB scanline element */
#define RGB_GREEN   1   /* Offset of Green */
#define RGB_BLUE    2   /* Offset of Blue */
#define RGB_PIXELSIZE   3   /* JSAMPLEs per RGB scanline element *//* Definitions for speed-related optimizations. *//* If your compiler supports inline functions, define INLINE* as the inline keyword; otherwise define it as empty.*/#ifndef INLINE
#ifdef __GNUC__         /* for instance, GNU C knows about inline */
#define INLINE __inline__
#endif
#ifndef INLINE
#define INLINE          /* default is to define it as empty */
#endif
#endif/* On some machines (notably 68000 series) "int" is 32 bits, but multiplying* two 16-bit shorts is faster than multiplying two ints.  Define MULTIPLIER* as short on such a machine.  MULTIPLIER must be at least 16 bits wide.*/#ifndef MULTIPLIER
#define MULTIPLIER  int     /* type for fastest integer multiply */
#endif/* FAST_FLOAT should be either float or double, whichever is done faster* by your compiler.  (Note that this type is only used in the floating point* DCT routines, so it only matters if you've defined DCT_FLOAT_SUPPORTED.)* Typically, float is faster in ANSI C compilers, while double is faster in* pre-ANSI compilers (because they insist on converting to double anyway).* The code below therefore chooses float if we have ANSI-style prototypes.*/#ifndef FAST_FLOAT
#ifdef HAVE_PROTOTYPES
#define FAST_FLOAT  float
#else
#define FAST_FLOAT  double
#endif
#endif#endif /* JPEG_INTERNAL_OPTIONS */

3、修改项目的属性

(1)右键项目名，修改输出类型为 DLL

(2)在预处理器选项中，删除 _LIB 选项，新增 LIBJPEG_EXPORTS选项

4、编译工程

编译成功后，会在输出目录下生成dll 和lib 文件，这样我们就可以调用了。

在Windows下使用vs2019编译libjpeg库相关推荐

Windows下使用VS2019编译libiconv-1.16
Windows下使用VS2019编译libiconv-1.16 参考了 https://blog.csdn.net/zhouguangcai8/article/details/105270657,在其 ...
windows下用vs2019编译fltk 1.3.5
1.下载源码.下载地址https://www.fltk.org/software.php 2.解压下载的压缩包. 3.启动visual studio,打开 -/fltk-1.3.xxxx/ide/Vi ...
Windows编译libjpeg库
Qt君最近在做图像相关的项目,用到了libjpeg库.记录libjpeg编译步骤供大家参考. 1.下载源码(jpegsrc9c.zip) 官网地址: http://www.ijg.org/ jepgs ...
VS2013编译libjpeg库
现在,很多图像处理工具和开源库都给出了图像解码的函数接口,然而有时这些接口并不能完全满足我们的需求,比如如果我们想直接去解码内存中的JPEG数据就没有这样的接口. 由于之前做的项目刚刚好设备传过来的图 ...
TensorFlow自带例子已经包含了android和ios下的摄像头图像分类示例Inception v1，这里补充一个Windows下的，使用AForge库(www.aforgenet.com)操作
TensorFlow自带例子已经包含了android和ios下的摄像头图像分类示例Inception v1,这里补充一个Windows下的,使用AForge库(www.aforgenet.com)操作 ...
实践详细篇-Windows下使用VS2015编译的Caffe训练mnist数据集
上一篇记录的是学习caffe前的环境准备以及如何创建好自己需要的caffe版本.这一篇记录的是如何使用编译好的caffe做训练mnist数据集,步骤编号延用上一篇 <实践详细篇-Windows下 ...
Windows下用CMake编译JsonCpp及配置（适合新手）
作者:翟天保Steven 版权声明:著作权归作者所有,商业转载请联系作者获得授权,非商业转载请注明出处 JsonCpp是什么? JSON是一种轻量级的数据交换格式.它可以表示数字.字符串.有序的值序列 ...
手把手教你在windows下源码编译Open3D
文章目录前言 1.编译环境 2.编译步骤 3.编译中的bug 3.1 下载超时问题,ispc.pybind11.open3d_sphinx_theme等 3.2 boringssl 3.3 Dire ...
【C#】C#中使用GDAL3（一）：Windows下超详细编译C#版GDAL3.3.0（VS2015+.NET 4+32位/64位）
转载请注明原文地址:https://www.cnblogs.com/litou/p/15004877.html 总目录 (一)Windows下超详细编译C#版GDAL3.3.0(VS2015+.NET ...

在Windows下使用vs2019编译libjpeg库

一、库的编译

二、编译动态库

在Windows下使用vs2019编译libjpeg库相关推荐

最新文章

热门文章