程序代码：

#include <windows.h>
int i=0;
extern "C" _declspec(dllexport) void dec2yyy(int yyy,int source,char* bin)
{
    if(source==0) return;
    dec2yyy(yyy,source/yyy,bin);
    if((source%yyy)<10) bin[i]=(char)(source%yyy+0x30);
    else bin[i]=(char)(source%yyy+0x37);
    i++;
}


BOOL APIENTRY DllMain( HANDLE hModule, DWORD  ul_reason_for_call,LPVOID lpReserved)
{
    switch (ul_reason_for_call)
    {
        case DLL_PROCESS_ATTACH:
        {
            // 

        }
        case DLL_THREAD_ATTACH:
        case DLL_THREAD_DETACH:
        case DLL_PROCESS_DETACH:
        break;
    }
    return TRUE;
}

程序代码：

#include<stdio.h>
#include<windows.h>

int main()
{
    HINSTANCE hDllInst = LoadLibrary("dlltest.DLL");
    typedef void (WINAPI *MYFUNC)(int,int,char*);
    MYFUNC mydec2yyy = NULL;
    mydec2yyy = (MYFUNC)GetProcAddress(hDllInst,"dec2yyy");
    char s[20];
    for(int i=0;i<20;i++) s[i]='\0';
    mydec2yyy(16,258,s);
    printf("%s\n",s);
    FreeLibrary(hDllInst);
    return 0;
}