how to use dll created by cygwin in MS Visual C++?

[wxWindows_study]

I follow cygwin's user guide,create a dll as following:

//****************************************************
// this the dll file :@test_dll.c
//created by songyewen 2004/03/21
//****************************************************

#include <stdio.h>

int show_hello()
{
    printf("this is the testing string from cygwin apps's dll file\n");
    return 0;
}

//------------------------------
gcc -c test_dll.c
gcc -shared -o test_dll.dll test_dll.o

so I get the test_dll.dll

//------------------------------

//************************************************************
//this file is a demo for testing dll in cygwin apps
//@test_main.c
//created by songyewen 2004/03/21
//************************************************************
#include <stdio.h>
int main()
{
    show_hello();
}


//-----------------------------
gcc -o test_main.c test_main.exe -L./ -ltest_dll
so I get test_main.exe and can run test_main.exe successfully!


But I failed to use the test_dll.dll in MS Visual C++?

Who can help me?

thanks in advance!!