Windows函数转发器

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互联网集市收集整理的这篇技术教程文章主要介绍了Windows函数转发器，小编现在分享给大家，供广大互联网技能从业者学习和参考。文章包含5046字，纯文字阅读大概需要8分钟。

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最近MSYS2升级后出现了一个bug，libxml264-157.dll被升级成了libxml264-159.dll，但是ffplay还依赖libxml264-157.dll，本来打算直接复制一个libxml264-159.dll重命名为libxml264-157.dll，但是发现libxml264-157.dll里面有一个函数x264_encoder_open_157在libxml264-159.dll变成了x264_encoder_open_159，这样程序就会找不到x264_encoder_open_157这个函数，最后我通过函数转发器解决了这个问题。函数转发器的声明如下：

// Function forwarders to functions in DllWork
#pragma comment(linker, "/export:SomeFunc=DllWork.SomeOtherFunc")

在Visual Studio中新建一个动态链接库项目，命名为libxml264-157，添加以下代码：

#pragma comment(linker, "/EXPORT:x264_10_frame_pop=libx264-159.x264_10_frame_pop")
#pragma comment(linker, "/EXPORT:x264_10_frame_push=libx264-159.x264_10_frame_push")
#pragma comment(linker, "/EXPORT:x264_10_frame_shift=libx264-159.x264_10_frame_shift")
#pragma comment(linker, "/EXPORT:x264_10_frame_unshift=libx264-159.x264_10_frame_unshift")
#pragma comment(linker, "/EXPORT:x264_10_threadpool_delete=libx264-159.x264_10_threadpool_delete")
#pragma comment(linker, "/EXPORT:x264_10_threadpool_init=libx264-159.x264_10_threadpool_init")
#pragma comment(linker, "/EXPORT:x264_10_threadpool_run=libx264-159.x264_10_threadpool_run")
#pragma comment(linker, "/EXPORT:x264_10_threadpool_wait=libx264-159.x264_10_threadpool_wait")
#pragma comment(linker, "/EXPORT:x264_8_frame_pop=libx264-159.x264_8_frame_pop")
#pragma comment(linker, "/EXPORT:x264_8_frame_push=libx264-159.x264_8_frame_push")
#pragma comment(linker, "/EXPORT:x264_8_frame_shift=libx264-159.x264_8_frame_shift")
#pragma comment(linker, "/EXPORT:x264_8_frame_unshift=libx264-159.x264_8_frame_unshift")
#pragma comment(linker, "/EXPORT:x264_8_threadpool_delete=libx264-159.x264_8_threadpool_delete")
#pragma comment(linker, "/EXPORT:x264_8_threadpool_init=libx264-159.x264_8_threadpool_init")
#pragma comment(linker, "/EXPORT:x264_8_threadpool_run=libx264-159.x264_8_threadpool_run")
#pragma comment(linker, "/EXPORT:x264_8_threadpool_wait=libx264-159.x264_8_threadpool_wait")
#pragma comment(linker, "/EXPORT:x264_chroma_format=libx264-159.x264_chroma_format")
#pragma comment(linker, "/EXPORT:x264_cpu_detect=libx264-159.x264_cpu_detect")
#pragma comment(linker, "/EXPORT:x264_cpu_names=libx264-159.x264_cpu_names")
#pragma comment(linker, "/EXPORT:x264_cpu_num_processors=libx264-159.x264_cpu_num_processors")
#pragma comment(linker, "/EXPORT:x264_encoder_close=libx264-159.x264_encoder_close")
#pragma comment(linker, "/EXPORT:x264_encoder_delayed_frames=libx264-159.x264_encoder_delayed_frames")
#pragma comment(linker, "/EXPORT:x264_encoder_encode=libx264-159.x264_encoder_encode")
#pragma comment(linker, "/EXPORT:x264_encoder_headers=libx264-159.x264_encoder_headers")
#pragma comment(linker, "/EXPORT:x264_encoder_intra_refresh=libx264-159.x264_encoder_intra_refresh")
#pragma comment(linker, "/EXPORT:x264_encoder_invalidate_reference=libx264-159.x264_encoder_invalidate_reference")
#pragma comment(linker, "/EXPORT:x264_encoder_maximum_delayed_frames=libx264-159.x264_encoder_maximum_delayed_frames")
#pragma comment(linker, "/EXPORT:x264_encoder_open_157=libx264-159.x264_encoder_open_159")
#pragma comment(linker, "/EXPORT:x264_encoder_parameters=libx264-159.x264_encoder_parameters")
#pragma comment(linker, "/EXPORT:x264_encoder_reconfig=libx264-159.x264_encoder_reconfig")
#pragma comment(linker, "/EXPORT:x264_free=libx264-159.x264_free")
#pragma comment(linker, "/EXPORT:x264_levels=libx264-159.x264_levels")
#pragma comment(linker, "/EXPORT:x264_log_default=libx264-159.x264_log_default")
#pragma comment(linker, "/EXPORT:x264_log_internal=libx264-159.x264_log_internal")
#pragma comment(linker, "/EXPORT:x264_malloc=libx264-159.x264_malloc")
#pragma comment(linker, "/EXPORT:x264_mdate=libx264-159.x264_mdate")
#pragma comment(linker, "/EXPORT:x264_nal_encode=libx264-159.x264_nal_encode")
#pragma comment(linker, "/EXPORT:x264_param2string=libx264-159.x264_param2string")
#pragma comment(linker, "/EXPORT:x264_param_apply_fastfirstpass=libx264-159.x264_param_apply_fastfirstpass")
#pragma comment(linker, "/EXPORT:x264_param_apply_profile=libx264-159.x264_param_apply_profile")
#pragma comment(linker, "/EXPORT:x264_param_default=libx264-159.x264_param_default")
#pragma comment(linker, "/EXPORT:x264_param_default_preset=libx264-159.x264_param_default_preset")
#pragma comment(linker, "/EXPORT:x264_param_parse=libx264-159.x264_param_parse")
#pragma comment(linker, "/EXPORT:x264_picture_alloc=libx264-159.x264_picture_alloc")
#pragma comment(linker, "/EXPORT:x264_picture_clean=libx264-159.x264_picture_clean")
#pragma comment(linker, "/EXPORT:x264_picture_init=libx264-159.x264_picture_init")
#pragma comment(linker, "/EXPORT:x264_reduce_fraction=libx264-159.x264_reduce_fraction")
#pragma comment(linker, "/EXPORT:x264_reduce_fraction64=libx264-159.x264_reduce_fraction64")
#pragma comment(linker, "/EXPORT:x264_slurp_file=libx264-159.x264_slurp_file")
#pragma comment(linker, "/EXPORT:x264_threading_init=libx264-159.x264_threading_init")

生成libxml264-157.dll，就解决了这个问题。

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