问题
I'm trying to write a simple PNG file using libpng in C using VS2013. I installed libpng from Nuget and included png.h, but I can't compile. I get this as my output:
1>main.obj : error LNK2019: unresolved external symbol png_create_write_struct referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_set_longjmp_fn referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_create_info_struct referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_write_info referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_destroy_write_struct referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_init_io referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_free_data referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_set_IHDR referenced in function writeImage
1>main.obj : error LNK2019: unresolved external symbol png_set_text referenced in function writeImage
I've tried playing with the compilation settings, but nothing seems to make it work. I don't get any red lines under any of those declarations when I write the code, so VS must be seeing some of the code.
回答1:
Besides including png.h you must also link with the appropriate import library (probably called libpng.lib or something similar). In Visual Studio, you would add this to Project Settings → Linker → Input → Additional Dependencies.
来源：https://stackoverflow.com/questions/27473741/visual-studio-2013-and-libpng