private void btnSelect_Click(object sender, EventArgs e) { try { int rtnTemp; int pucSN = 0; rtnTemp = IDCardAPI.SDT_SelectIDCard(iPort, ref pucSN, 1); //再选卡 if (rtnTemp != 144) { //rtnTemp = SDT_ClosePort(EdziPortID); txtSelect.Text = "读卡失败!"; } else { txtSelect.Text = "选卡成功"; } } catch (Exception ex) { MessageBox.Show(ex.Message); } }