WIN下免费pdf转图片PNG/JPG/TIFF软件，poppler和pdftocairo开源库编译，中文文件名出错修正
wxleasyland@139.com
2021.12
想要一个打印到图片的虚拟打印机软件，结果都是收费的。自已编是不可能的，工作量太大。
现在PDF虚拟打印机很多，可以打成PDF，再转成图片。
想要一个免费的简单的PDF转图片开源软件，结果不好找。
发现商用PDF SDK都是收费的，只好用PDF开源库来做了。
poppler开源库用于PDF浏览等，附带了一个pdftocairo可以转换pdf到图片的程序。
于是自己编译poppler和pdftocairo。
VS里，pdftocairo项目是依赖poppler项目的。
一、不要自己编译poppler的依赖库！
poppler项目是采用cmake来生成的，需先安装cmake。
cmake成功后会成生VC用的解决方案.sln，用VS打开它就可以了。
poppler主要是面向linux的，对WINDOWS不友好，它的依赖库相当多，而且有的依赖库又还有其它的依赖库，自己用VS编译的难度非常大！
从网上一个一个地下载开源依赖库，一个个编译，每个依赖库编译方法都不一样。
英文不好，工具不熟，花了大量精力，说多了都是泪，从入门到放弃，直接跳第二章。
在网上可以下载到各个WIN版生成好的依赖库，但都很老了，都是2011年以前的了，因为现在WIN下面可以方便地用vcpkg安装依赖库了，所以他们都没更新了。
网址：https://download-fallback.gnome.org/binaries/win32/dependencies/
这里记录了放弃的过程：
需要用VS2015及以上。VS2012不行，不支持新特性，一些库的程序在编译时会出错。
用cmake图形界面或命令行都可以。
出错：CMake Error at cmake/modules/PopplerMacros.cmake:91 (message): Unsupported CMAKE_BUILD_TYPE:
解决：
加上这个ENTRY: CMAKE_BUILD_TYPE，值release，就可以（见《INSTALL》文件）
也可以CMakeLists.txt文件中加在project(poppler)下面：
SET(CMAKE_BUILD_TYPE "release" CACHE STRING "")
出错：No test data found in $testdatadir.
解决：
去https://github.com/freedesktop/poppler-test下载，然后放在一个目录，然后加ENTRY，比如：
SET(TESTDATADIR "C:/VC_PROJ/poppler-21.11.0/poppler-test-master" CACHE STRING "")
cairo库
还需要pixman库，gnumake.exe
freetype
release,静态库lib, unicode环境 ,/MD
libjpeg
release,静态库lib, unicode ,/MD
tiff
直接用下载的库
zlib
用nmake生成，zlib.lib是静态库/MD
libpng
release,静态库lib, 多字节,/MD
boost
要VS2015及以上，不然提示出错：只有静态常量整型数据成员才可以在类中初始化
于是用VS2017生成。
openjpeg
直接用官方生成好的OpenJPEG 2.3.1版x86
SET(OpenJPEG_DIR "C:/VC_PROJ/openjpeg-v2.3.1-windows-x86/lib/openjpeg-2.3" CACHE PATH "")
在这个目录中才有OpenJPEGConfig.cmake文件，才行。
pkg-config （用于帮助生成编译命令行选项）
libiconv
需要用cygwin。You also need the scripts 'ar-lib' and 'compile'。
到libiconv这里卡住了，虽然就快差不多了，但还要一些东东才行，太麻烦了，不想进行了，放弃，改用vcpkg install。
这时，自己修改补充的CMakeLists.txt文件内容如下：
cmake_minimum_required(VERSION 3.10.0 FATAL_ERROR)
project(poppler)
SET(CMAKE_BUILD_TYPE "release" CACHE STRING "")
SET(TESTDATADIR "C:/VC_PROJ/poppler-21.11.0/poppler-test-master" CACHE STRING "")
SET(FREETYPE_INCLUDE_DIR_freetype2 "C:/VC_PROJ/freetype-2.10.2/freetype-2.10.2/include/freetype" CACHE PATH "")
SET(FREETYPE_INCLUDE_DIR_ft2build "C:/VC_PROJ/freetype-2.10.2/freetype-2.10.2/include" CACHE PATH "")
SET(FREETYPE_LIBRARY_DEBUG "C:/VC_PROJ/freetype-2.10.2/freetype-2.10.2/objs/Win32/Release Static/freetype.lib" CACHE FILEPATH "")
SET(FREETYPE_LIBRARY_RELEASE "C:/VC_PROJ/freetype-2.10.2/freetype-2.10.2/objs/Win32/Release Static/freetype.lib" CACHE FILEPATH "")
SET(JPEG_INCLUDE_DIR "C:/VC_PROJ/libjpeg_VS2012" CACHE PATH "")
SET(JPEG_LIBRARY_DEBUG "C:/VC_PROJ/libjpeg_VS2012/Release/Win32/jpeg.lib" CACHE FILEPATH "")
SET(JPEG_LIBRARY_RELEASE "C:/VC_PROJ/libjpeg_VS2012/Release/Win32/jpeg.lib" CACHE FILEPATH "")
SET(TIFF_INCLUDE_DIR "C:/VC_PROJ/tiff-3.8.2-1-lib/include" CACHE PATH "")
SET(TIFF_LIBRARY_DEBUG "C:/VC_PROJ/tiff-3.8.2-1-lib/lib/libtiff.lib" CACHE FILEPATH "")
SET(TIFF_LIBRARY_RELEASE "C:/VC_PROJ/tiff-3.8.2-1-lib/lib/libtiff.lib" CACHE FILEPATH "")
SET(ZLIB_INCLUDE_DIR "C:/VC_PROJ/zlib-1.2.11" CACHE PATH "")
SET(ZLIB_LIBRARY_DEBUG "C:/VC_PROJ/zlib-1.2.11/zlib.lib" CACHE FILEPATH "")
SET(ZLIB_LIBRARY_RELEASE "C:/VC_PROJ/zlib-1.2.11/zlib.lib" CACHE FILEPATH "")
SET(PNG_PNG_INCLUDE_DIR "C:/VC_PROJ/libpng-1.6.37" CACHE PATH "")
SET(PNG_LIBRARY_DEBUG "C:/VC_PROJ/libpng-1.6.37/projects/vstudio/Release Library/libpng16.lib" CACHE FILEPATH "")
SET(PNG_LIBRARY_RELEASE "C:/VC_PROJ/libpng-1.6.37/projects/vstudio/Release Library/libpng16.lib" CACHE FILEPATH "")
SET(OpenJPEG_DIR "C:/VC_PROJ/openjpeg-v2.3.1-windows-x86/lib/openjpeg-2.3" CACHE PATH "")
#SET(ENABLE_BOOST FALSE CACHE BOOL "")
SET(CAIRO_INCLUDE_DIR "C:/VC_PROJ/cairo-1.17.4/src" CACHE PATH "")
SET(CAIRO_LIBRARY "C:/VC_PROJ/cairo-1.17.4/src/release/cairo-static.lib" CACHE FILEPATH "")
SET(Boost_INCLUDE_DIR "C:/VC_PROJ/boost_1_77_0" CACHE PATH "")
SET(Boost_DIR "C:/VC_PROJ/boost_1_77_0" CACHE PATH "")
SET(PKG_CONFIG_EXECUTABLE "C:/VC_PROJ/pkg-config-0.29.2/release/Win32/pkg-config.exe" CACHE FILEPATH "")
二、直接用vcpkg下载编译poppler的依赖库！
都2021年了，现在WINDOWS下都是用vcpkg来安装各个开源库了，非常方便！大家不要自己去下载和编译了！
vcpkg需要VS2015及以上。需要有英文语言VS。
VCPKG带有poppler库，你要用直接用它也可以，我没有用。
我是下载POPPLER开源库，而依赖库用VCPKG下载编译的！！
可以用VCPKG安装poppler，这样它的依赖库都会一并装好了！
vcpkg install poppler:x86-windows
vcpkg install curl:x86-windows
VCPKG install安装时有的文件不好下载，可以自己另外下载后改成目标文件名，放到downloads目录中，再次vcpkg install，即马上成功。
然后会有cmake可以用的toolchain文件，在 C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake，有它的话,cmake可以找到所有vcpkg安装的库！太方便了。
所以，一定要在poppler库的cmakelists.txt文件第一行（首行）加上：
set(CMAKE_TOOLCHAIN_FILE "C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake" )
注意是：一定是首行，set是小写，这样cmake才会知道这个toolchain！
其它自己加的ENTRY放在“project(poppler)”后面：
SET(CMAKE_BUILD_TYPE "release" CACHE STRING "")
SET(TESTDATADIR "C:/VC_PROJ/poppler-21.11.0/poppler-test-master" CACHE STRING "")
SET(PKG_CONFIG_EXECUTABLE "C:/VC_PROJ/pkg-config-0.29.2/release/Win32/pkg-config.exe" CACHE FILEPATH "")
需要pkg-config，可以是VCPKG下载的或自己编译的。
最后修改后的cmakelists.txt文件内容为：
set(CMAKE_TOOLCHAIN_FILE "C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake" )
cmake_minimum_required(VERSION 3.10.0 FATAL_ERROR)
project(poppler)
SET(CMAKE_BUILD_TYPE "release" CACHE STRING "")
SET(TESTDATADIR "C:/VC_PROJ/poppler-21.11.0/poppler-test-master" CACHE STRING "")
#SET(PKG_CONFIG_EXECUTABLE "C:/VC_PROJ/pkg-config-0.29.2/release/Win32/pkg-config.exe" CACHE FILEPATH "")
SET(PKG_CONFIG_EXECUTABLE "C:/VC_PROJ/vcpkg-master/installed/x86-windows/tools/pkgconf/pkgconf.exe" CACHE FILEPATH "")
然后cmake成功，提示信息如下：
Selecting Windows SDK version 10.0.17763.0 to target Windows 10.0.19043.
The C compiler identification is MSVC 19.16.27045.0
The CXX compiler identification is MSVC 19.16.27045.0
Detecting C compiler ABI info
Detecting C compiler ABI info - done
Check for working C compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x86/cl.exe - skipped
Detecting C compile features
Detecting C compile features - done
Detecting CXX compiler ABI info
Detecting CXX compiler ABI info - done
Check for working CXX compiler: C:/Program Files (x86)/Microsoft Visual Studio/2017/Professional/VC/Tools/MSVC/14.16.27023/bin/Hostx86/x86/cl.exe - skipped
Detecting CXX compile features
Detecting CXX compile features - done
Found PkgConfig: C:/VC_PROJ/vcpkg-master/installed/x86-windows/tools/pkgconf/pkgconf.exe (found version "1.8.0")
-- Using win32 threads
Checking _FILE_OFFSET_BITS for large files
Checking _FILE_OFFSET_BITS for large files - not needed
Found Freetype: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/freetype.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/freetyped.lib (found version "2.11.0")
Found JPEG: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/jpeg.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/jpeg.lib (found version "62")
Found ZLIB: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/zlib.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/zlibd.lib (found version "1.2.11")
Found PNG: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/libpng16.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/libpng16d.lib (found version "1.6.37")
Found TIFF: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/tiff.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/tiffd.lib (found version "4.3.0")
CMake Warning at C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake:788 (_find_package):
By not providing "FindQt5Core.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5Core", but
CMake did not find one.
Could not find a package configuration file provided by "Qt5Core"
(requested version 5.9) with any of the following names:
Qt5CoreConfig.cmake
qt5core-config.cmake
Add the installation prefix of "Qt5Core" to CMAKE_PREFIX_PATH or set
"Qt5Core_DIR" to a directory containing one of the above files. If
"Qt5Core" provides a separate development package or SDK, be sure it has
been installed.
Call Stack (most recent call first):
CMakeLists.txt:197 (find_package)
CMake Warning at C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake:788 (_find_package):
By not providing "FindQt5Gui.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5Gui", but
CMake did not find one.
Could not find a package configuration file provided by "Qt5Gui" with any
of the following names:
Qt5GuiConfig.cmake
qt5gui-config.cmake
Add the installation prefix of "Qt5Gui" to CMAKE_PREFIX_PATH or set
"Qt5Gui_DIR" to a directory containing one of the above files. If "Qt5Gui"
provides a separate development package or SDK, be sure it has been
installed.
Call Stack (most recent call first):
CMakeLists.txt:198 (find_package)
CMake Warning at C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake:788 (_find_package):
By not providing "FindQt5Xml.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5Xml", but
CMake did not find one.
Could not find a package configuration file provided by "Qt5Xml" with any
of the following names:
Qt5XmlConfig.cmake
qt5xml-config.cmake
Add the installation prefix of "Qt5Xml" to CMAKE_PREFIX_PATH or set
"Qt5Xml_DIR" to a directory containing one of the above files. If "Qt5Xml"
provides a separate development package or SDK, be sure it has been
installed.
Call Stack (most recent call first):
CMakeLists.txt:199 (find_package)
CMake Warning at C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake:788 (_find_package):
By not providing "FindQt5Widgets.cmake" in CMAKE_MODULE_PATH this project
has asked CMake to find a package configuration file provided by
"Qt5Widgets", but CMake did not find one.
Could not find a package configuration file provided by "Qt5Widgets" with
any of the following names:
Qt5WidgetsConfig.cmake
qt5widgets-config.cmake
Add the installation prefix of "Qt5Widgets" to CMAKE_PREFIX_PATH or set
"Qt5Widgets_DIR" to a directory containing one of the above files. If
"Qt5Widgets" provides a separate development package or SDK, be sure it has
been installed.
Call Stack (most recent call first):
CMakeLists.txt:200 (find_package)
CMake Warning at C:/VC_PROJ/vcpkg-master/scripts/buildsystems/vcpkg.cmake:788 (_find_package):
By not providing "FindQt5Test.cmake" in CMAKE_MODULE_PATH this project has
asked CMake to find a package configuration file provided by "Qt5Test", but
CMake did not find one.
Could not find a package configuration file provided by "Qt5Test" with any
of the following names:
Qt5TestConfig.cmake
qt5test-config.cmake
Add the installation prefix of "Qt5Test" to CMAKE_PREFIX_PATH or set
"Qt5Test_DIR" to a directory containing one of the above files. If
"Qt5Test" provides a separate development package or SDK, be sure it has
been installed.
Call Stack (most recent call first):
CMakeLists.txt:201 (find_package)
-- Package Qt5Core or Qt5Gui or Qt5Xml or Qt5Widgets or Qt5Test not found
-- Package Qt6Core or Qt6Gui or Qt6Widgets or Qt6Test not found
Found Cairo: C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/cairo.lib (Required is at least version "1.10.0")
Found Boost: C:/VC_PROJ/vcpkg-master/installed/x86-windows/include (found suitable version "1.77.0", minimum required is "1.58.0")
Checking for modules 'glib-2.0>=2.56;gobject-2.0>=2.56;gio-2.0>=2.56'
Package 'glib-2.0', required by 'virtual:world', not found
Package 'gobject-2.0', required by 'virtual:world', not found
Package 'gio-2.0', required by 'virtual:world', not found
Could NOT find GLIB (missing: GLIB2_LIBRARIES GLIB2_CFLAGS)
Performing Test ICONV_SECOND_ARGUMENT_IS_CONST
Performing Test ICONV_SECOND_ARGUMENT_IS_CONST - Failed
Found Iconv: C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/iconv.lib
Found lcms version 2.12, C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/lcms2.lib
Found ZLIB: optimized;C:/VC_PROJ/vcpkg-master/installed/x86-windows/lib/zlib.lib;debug;C:/VC_PROJ/vcpkg-master/installed/x86-windows/debug/lib/zlibd.lib (found suitable version "1.2.11", minimum required is "1")
Checking for module 'poppler-data'
Package 'poppler-data', required by 'virtual:world', not found
Looking for include file dlfcn.h
Looking for include file dlfcn.h - not found
Looking for include file fcntl.h
Looking for include file fcntl.h - found
Looking for include file stdlib.h
Looking for include file stdlib.h - found
Looking for include file sys/mman.h
Looking for include file sys/mman.h - not found
Looking for include file sys/stat.h
Looking for include file sys/stat.h - found
Looking for include file unistd.h
Looking for include file unistd.h - not found
Looking for fseek64
Looking for fseek64 - not found
Looking for fseeko
Looking for fseeko - not found
Looking for ftell64
Looking for ftell64 - not found
Looking for pread64
Looking for pread64 - not found
Looking for lseek64
Looking for lseek64 - not found
Looking for gmtime_r
Looking for gmtime_r - not found
Looking for timegm
Looking for timegm - not found
Looking for gettimeofday
Looking for gettimeofday - not found
Looking for localtime_r
Looking for localtime_r - not found
Looking for popen
Looking for popen - not found
Looking for mkstemp
Looking for mkstemp - not found
Looking for strtok_r
Looking for strtok_r - not found
Performing Test HAVE_DIRENT_H
Performing Test HAVE_DIRENT_H - Failed
Performing Test HAVE_NDIR_H
Performing Test HAVE_NDIR_H - Failed
Performing Test HAVE_SYS_DIR_H
Performing Test HAVE_SYS_DIR_H - Failed
Performing Test HAVE_SYS_NDIR_H
Performing Test HAVE_SYS_NDIR_H - Failed
Looking for nanosleep
Looking for nanosleep - not found
Looking for nanosleep in rt
Looking for nanosleep in rt - not found
Performing Test COMPILER_HAS_DEPRECATED_ATTR
Performing Test COMPILER_HAS_DEPRECATED_ATTR - Failed
Performing Test COMPILER_HAS_DEPRECATED
Performing Test COMPILER_HAS_DEPRECATED - Success
Building Poppler with support for:
font configuration: win32
use boost (Splash): yes
cairo output: yes
qt5 wrapper: no
qt6 wrapper: no
glib wrapper: no
introspection: no
gtk-doc: no
cpp wrapper: yes
use libjpeg: yes
use libpng: yes
use libtiff: yes
use zlib compress: yes
use zlib uncompress: no
use nss3: no
use curl: yes
use libopenjpeg2: yes
use lcms2: yes
command line utils: yes
fuzz target: no
test data dir: C:/VC_PROJ/poppler-21.11.0/poppler-test-master
Configuring done
自动生成的ENTRY是这样的：依赖库的include目录在C:/VC_PROJ/vcpkg-master/installed/x86-windows/include
VS2017打开项目方案.sln，编译成功！
生成pdftocairo.exe等文件在C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\Debug。
pdftocairo 可以运行，但需要多个依赖库的dll文件才行！
pdftocairo是依赖了poppler静态库，但其它的依赖库都是dll。
三、用静态库来生成pdftocairo
（后注：网友说在cmakelists.txt文件中加上相关项就可以使用vcpkg的静态依赖库了：
在project命令前设置:
set(VCPKG_TARGET_TRIPLET "x86-windows-static" CACHE STRING "" FORCE)
set(CMAKE_TOOLCHAIN_FILE "vcpkg\\scripts\\buildsystems\\vcpkg.cmake")
我没有试了。本章就算看看热闹吧。
）
尝试用静态库来生成pdftocairo.exe，就不需要各个dll文件了。
先安装依赖库，比如：
vcpkg install poppler:x86-windows-static
这样相关静态依赖库都会安装好。（静态依赖库和上面的动态依赖库是分开放的）
curl单独安装：
vcpkg install curl:x86-windows-static
再在VS2017的pdftocairo项目里，把“链接器”选项的依赖库，改成static目录里的：
比如：
原来是C:\VC_PROJ\vcpkg-master\installed\x86-windows\lib\cairo.lib
改成：
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\cairo.lib
结果编译不行，提示很多错，比如：
错误LNK2019无法解析的外部符号 __imp__cairo_create，该符号在函数 "void __cdecl renderPage(class PDFDoc *,class CairoOutputDev *,int,double,double,double,double)" (?renderPage@@YAXPAVPDFDoc@@PAVCairoOutputDev@@HNNNN@Z) 中被引用 C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\pdftocairo.obj
即找不到__imp__cairo_create这个函数符号。
静态库看dumpbin /linkermember cairo.lib，看到有_cairo_create，但没有__imp__cairo_create
动态库看dumpbin /linkermember cairo.lib，看到有__imp__cairo_create，也有_cairo_create
pdftocairo是引用了__imp__cairo_create，而不是引用_cairo_create，所以用静态库就找不到函数了。
发现cairo.h静态库和动态库的头文件不一样，在不同目录。
静态库cairo.h：
#ifndef cairo_public
# if defined (_MSC_VER) && ! 1
# define cairo_public __declspec(dllimport)
# else
# define cairo_public
# endif
#endif
动态库cairo.h：
#ifndef cairo_public
# if defined (_MSC_VER) && ! 0
# define cairo_public __declspec(dllimport)
# else
# define cairo_public
# endif
#endif
所以头文件会影响静态库、动态库的函数名称，应该要包含“静态库目录”的头文件！
在VS2017的pdftocairo项目里，把“C/C++”、“常规”选项的包含目录，改成static目录里的。
改成
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\include
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\include\cairo
编译，还提示很多错，比如：
错误LNK2019无法解析的外部符号 _pixman_format_supported_destination，该符号在函数 __pixman_format_from_masks 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\cairo.lib(cairo-image-surface.c.obj)
解决：
因为缺少依赖库本身的依赖库，比如cairo静态库有了，但cairo静态库本身还需要pixman静态库，还需要把pixman静态库lib搞进来。如果cairo是运态库dll，就没有这个烦恼了。所以静态库项目比较麻烦。
VS链接器选项中加入依赖库：
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\pixman-1.lib
错误LNK2019无法解析的外部符号 __imp__GradientFill@24，该符号在函数 __cairo_win32_printing_surface_paint_linear_pattern 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\cairo.lib(win32_cairo-win32-printing-surface.c.obj)
解决：GradientFill是WINDOWS系统的Msimg32.lib，将它加入链接器选项中，直接写Msimg32.lib即可，OK。
错误LNK2019无法解析的外部符号 _FcConfigGetCurrent，该符号在函数 __cairo_ft_font_face_get_implementation 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\cairo.lib(cairo-ft-font.c.obj)
解决：
经findstr在lib文件中查找FcConfigGetCurrent，发现该函数是在fontconfig.lib中。加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\fontconfig.lib
错误LNK2019无法解析的外部符号 _BrotliDecoderDecompress，该符号在函数 _woff2_decompress 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\freetype.lib(sfnt.c.obj)
解决：加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\brotlidec-static.lib
错误LNK2019无法解析的外部符号 _BZ2_bzDecompressInit，该符号在函数 _FT_Stream_OpenBzip2 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\freetype.lib(ftbzip2.c.obj)
解决：加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\bz2.lib
错误LNK2019无法解析的外部符号 __imp__cmsGetEncodedCMMversion@0，该符号在函数 "public: char * __thiscall GfxICCBasedColorSpace::getPostScriptCSA(void)" (?getPostScriptCSA@GfxICCBasedColorSpace@@QAEPADXZ) 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\poppler.lib(GfxState.obj)
解决：
因为poppler库中调用的是lcms的DLL库，不是lcms静态库，还要修改poppler库项目。
改poppler库项目的包含目录，从C:\VC_PROJ\vcpkg-master\installed\x86-windows\include，改成C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\include。
再重新生成。
错误LNK2019无法解析的外部符号 _BrotliTransformDictionaryWord，该符号在函数 _ProcessCommands 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\brotlidec-static.lib(decode.c.obj)
解决：加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\brotlicommon-static.lib
错误LNK2019无法解析的外部符号 _XML_ParserCreate，该符号在函数 _FcConfigParseAndLoadFromMemoryInternal 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\fontconfig.lib(fcxml.c.obj)
解决：加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\libexpatMD.lib
错误LNK2019无法解析的外部符号 _lzma_code，该符号在函数 _LZMADecode 中被引用 pdftocairo C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\tiff.lib(tif_lzma.c.obj)
解决：加入C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\lzma.lib
最终成功：
生成了C:\VC_PROJ\poppler-21.11.0\poppler-21.11.0\build\utils\Release\pdftocairo.exe
运行OK，不需要那些dll文件了。
VS2017的pdftocairo项目中，“链接器”是这样的设置：
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\lzma.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\libexpatMD.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\brotlicommon-static.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\bz2.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\brotlidec-static.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\fontconfig.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\cairo.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\pixman-1.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\freetype.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\lcms2.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\jpeg.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\libcurl.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\openjp2.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\libpng16.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\zlib.lib
C:\VC_PROJ\vcpkg-master\installed\x86-windows-static\lib\tiff.lib
..\Release\poppler.lib
winmm.lib
ws2_32.lib
advapi32.lib
crypt32.lib
gdi32.lib
kernel32.lib
user32.lib
winspool.lib
shell32.lib
ole32.lib
oleaut32.lib
uuid.lib
comdlg32.lib
Msimg32.lib
四、pdftocairo的文件中文名问题修正
pdftocairo.exe，如果输出文件名是有中文，则会出错！
比如 pdftocairo -png 我.pdf
提示Error opening output file 鎴?
如果输出文件名没有中文，则OK，没问题。 比如 pdftocairo -png 我.pdf aaa
poppler是按UTF8文件名打开文件的，见别人说的：
poppler的windows实现中，打开文件经过了一次文件名从utf8到utf16的转码。
// try to open file
#ifdef _WIN32
wchar_t *wFileName = (wchar_t*)utf8ToUtf16(fileName->getCString());
file = GooFile::open(wFileName);
gfree(wFileName);
#else
因此，这就要求我们输入文件名给poppler也是使用utf8编码的。
pdftocairo会按unicode读入命令行，再转化成utf8，以方便poppler打开。
所以不是poppler的问题，是pdftocairo处理输出文件名时，有bug。
分析一下pdftocairo项目程序pdftocairo.cc：
文件名称会存放在GooString类中。
找到是writePageImage()这个函数中出错提示Error opening output file。
输出到PNG\JPG\TIFF图片，则printing变量是0，不算是printing。输出到PS\EPS\PDF\SVG或打印机，就算是printing。
printToWin32 是表示打印到windows打印机。
主程序循环中调用：beginDocument，beginPage，renderPage，endPage。
beginDocument()中，如果是printing，则有打开fopen输出文件。
endPage()中，如果不是printing，则调用→writePageImage()中有打开fopen输出文件。
都是因为采用UTF8文件名来fopen，所以出错了，需要用多字节字符串才行。
把这二个地方都改一下：
writePageImage()中：
if (filename->cmp("fd://0") == 0) {
#if defined(_WIN32) || defined(__CYGWIN__)
_setmode(fileno(stdout), O_BINARY);
#endif
file = stdout;
} else
{
//经测试，这里filename->c_str()是UTF8字串，所以fopen会出错，需转换成windows的多字节字串才行。
file = 0;
// UTF8转unicode宽字符
char wbuff[4000];
int wi;
wi = MultiByteToWideChar(CP_UTF8, 0, filename->c_str(), -1, (LPWSTR)wbuff, 4000);
wbuff[wi * 2] = 0;
wbuff[wi * 2 + 1] = 0;
if (wi == 0)
goto WOUT;
//unicode宽字符转多字节ANSI
char wbuff2[4000];
wi = WideCharToMultiByte(CP_ACP, NULL,(LPCWCH) wbuff, -1, wbuff2, 4000, 0, 0);
wbuff2[wi] = 0;
if (wi == 0)
goto WOUT;
file = fopen(wbuff2, "wb");
//file = fopen(filename->c_str(), "wb");
WOUT:;
}
if (!file) {
fprintf(stderr, "FUNCTION writePageImage() Error opening output file %s\n", filename->c_str());
exit(2);
}
beginDocument()中：
if (outputFileName->cmp("fd://0") == 0) {
#if defined(_WIN32) || defined(__CYGWIN__)
_setmode(fileno(stdout), O_BINARY);
#endif
output_file = stdout;
}
else
{
output_file = 0;
// UTF8转unicode宽字符
char wbuff[4000];
int wi;
wi = MultiByteToWideChar(CP_UTF8, 0, outputFileName->c_str(), -1, (LPWSTR)wbuff, 4000);
wbuff[wi * 2] = 0;
wbuff[wi * 2 + 1] = 0;
if (wi == 0)
goto WbeginDocumentOUT;
// unicode宽字符转多字节ANSI
char wbuff2[4000];
wi = WideCharToMultiByte(CP_ACP, NULL, (LPCWCH)wbuff, -1, wbuff2, 4000, 0, 0);
wbuff2[wi] = 0;
if (wi == 0)
goto WbeginDocumentOUT;
output_file = fopen(wbuff2, "wb");
//output_file = fopen(outputFileName->c_str(), "wb");
WbeginDocumentOUT:
if (!output_file)
{
fprintf(stderr, "FUNCGION beginDocument() Error opening output file %s\n", outputFileName->c_str());
exit(2);
}
}
成功。
五、poppler-data库
poppler-data说是可以让poppler正确地渲染CJK中日韩文字。
但应该是linux中才需要，没找到在win中的安装方法，不知道怎么安装。不用了。实际中文显示正常。
六、成品软件下载
pdftocairo.exe是命令行的，使用也很简单。
https://download.csdn.net/download/wxlfreewind/54145551
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