1.mingw和msvc g++ -fpic HelloWorld.cpp -shared -o test.dllg++ -L . -ltest .\test.cpp 注意-L后面的.挨不挨着都行，-l不需要-ltest.dll，只需要-ltest  2.dll.cpp extern "C" {__declspec(dllexport) int __stdcall add(in