函数名没问题，可以编译，在进入运行后，使用该功能会中断运行，说在IDCard.dll中无法找到SDT_OpenPort的入口点？

Question

    [DllImport("IDCard.dll", EntryPoint = "SDT_GetCOMBaud", CharSet = CharSet.Ansi)]
    public static extern int SDT_GetCOMBaud(int iPort, ref uint puiBaudRate);
    [DllImport("IDCard.dll", EntryPoint = "SDT_OpenPort", CharSet = CharSet.Ansi)]
    public static extern int SDT_OpenPort(int iPort);

            [DllImport("IDCard.dll", EntryPoint = "SDT_SetCOMBaud (int iPort, uint uiCurrBaud, uint uiSetBaud)SDT_OpenPort", CharSet = CharSet.Ansi)]
    public static extern int SDT_SetCOMBaud(int iPort);
    [DllImport("IDCard.dll", EntryPoint = "SDT_ClosePort", CharSet = CharSet.Ansi)]
    public static extern int SDT_ClosePort(int iPort);

 private void button4_Click(object sender, EventArgs e)
        {
            IDCardData CardMsg = new IDCardData();
            int nRet, nPort;
            string stmp;
            byte[] cPath = new byte[255];
            byte[] pucIIN = new byte[4];
            byte[] pucSN = new byte[8];
            nPort = m_iPort;

                    if (SDT_OpenPort(nPort) == 0)

         }

哪位指点下迷津，究竟是哪里除了问题

Answer 1

用depend打开IDCard.dll看看，有没有SDT_OpenPort的导出函数
还有就是32bit/64bit是否匹配，主程序和dll要相同架构