how can i use jpeg_mem_src, jpeg_mem_dest in libjpeg-turbo?

问题:

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 

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

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

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

回答1:

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.

文章来源: how can i use jpeg_mem_src, jpeg_mem_dest in libjpeg-turbo?