C和C++混合编程中出现error LNK2001: unresolved external symbol "void __cdecl av_free(void *)" (?av_free@@YAXP
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今天需要把C写的程序模块放在MFC建的工程里面使用,发现运行过程中出现了
error LNK2001: unresolved external symbol "void __cdecl av_free(void *)" (?av_free@@YAXPAX@Z)
这样的问题
找到一个解决的办法分享一下
这个问题主要是声明的函数程序在运行过程中没有找到实体函数找到的,解决方法是
#ifdef __cplusplus
extern "C"
{
#endif
void av_jap(...);//这些函数用extern C进行声明,这样编译就ok了
void av_usa(...);
#ifdef __cplusplus
}
#endif
另外一种做法更简单
就是把包含的c语言的.h文件用
extern “C”
{
#include "Decoder/avcodec.h"
}
这样也行,更简单,这其实就是告诉编译器这是全局的
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