c language sample question

[haozhuo1987]

hi redboltz i want use c language to package some data by msgpack-c，when i read sample_c.c this file，i don't understand some api,because i can not find intruduce for this api,just like this picture, could you tell me some information about this api,how to use it and what parameter means? 3ks

[Reobos]

You can find documentation about the C api on the wiki here: https://github.com/msgpack/msgpack-c/wiki/v2_0_c_overview#packer

Also the sample uses msgpack_unpack which is said to be obsolete in this section: https://github.com/msgpack/msgpack-c/wiki/v2_0_c_overview#using-unpack-function