private void btnHotCloseDevice_Click(object sender, EventArgs e) { string port = this.txtHotPort.Text.Trim(); if (port.StartsWith("lpt")) { if (helper.Close()) { this.btnHotOpenDevice.Enabled = true; this.btnHotCloseDevice.Enabled = false; this.btnHotGetState.Enabled = false; this.btnBeginPrint.Enabled = false; this.btnEndPrint.Enabled = false; this.btnPrintCommandOnce.Enabled = false; this.lbOperationHint.Text = "关闭并口成功!"; } else { this.lbOperationHint.Text = "关闭并口失败!"; } } else { if (helper2.Close()) { this.btnHotOpenDevice.Enabled = true; this.btnHotCloseDevice.Enabled = false; this.btnHotGetState.Enabled = false; this.btnBeginPrint.Enabled = false; this.btnEndPrint.Enabled = false; this.btnPrintCommandOnce.Enabled = false; this.lbOperationHint.Text = "关闭串口成功!"; } else { this.lbOperationHint.Text = "关闭串口失败!"; } } }