我如何使用jpeg_mem_src，jpeg_mem_dest在libjpeg-turbo？ [英] how can i use jpeg_mem_src, jpeg_mem_dest in libjpeg-turbo?

问题描述

libjpeg8 include是这两个函数，但在libjpeg-turbo中有以下内容：

libjpeg8 include are those two functions, but in libjpeg-turbo has the following:

 //jconfig.h
 #define JPEG_LIB_VERSION 62

...

//jpeglib.h
#if JPEG_LIB_VERSION >= 80
/* Data source and destination managers: memory buffers. */
EXTERN(void) jpeg_mem_dest JPP((j_compress_ptr cinfo,
                   unsigned char ** outbuffer,
                   unsigned long * outsize));
EXTERN(void) jpeg_mem_src JPP((j_decompress_ptr cinfo,
                  unsigned char * inbuffer,
                  unsigned long insize));
#endif

如果我尝试使用JPEG_LIB_VERSION 80 ：

if i try to use "JPEG_LIB_VERSION 80" i'll get the following:

错误LNK2019：未解析的外部符号_jpeg_mem_src在函数...中引用

error LNK2019: unresolved external symbol _jpeg_mem_src referenced in function ...

所以，如果可能，我如何使用这些功能？我需要编译libjpeg-turbo的一些包吗？

so, how can i use those functions if it possible? do i need compile some package of libjpeg-turbo?

推荐答案

预编译的.lib和.dll文件只支持版本6功能。你需要编译自己的库。将 -DWITH_JPEG8 = 1 标志传递给CMake以获取这两个函数。

The precompiled .lib and .dll files only support the version 6 functions. You need to compile your own library. Pass the -DWITH_JPEG8=1 flag to CMake to get those two functions.

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