Operation not valid while the port is the opened!-CodePudding

Below is open the serial port code, debugging is displayed operation not valid while the port is the opened, how should solve? A great god, please give directions

 
Void CCommTestDlg: : OnBnClickedButtonOpen () 
{
//TODO: add the control notification handler code 
If (m_mscomm get_PortOpen ())//if a serial port is open, the line close a serial port 
{
M_mscomm. Put_PortOpen (FALSE); 
} 
M_mscomm. Put_PortOpen (3);//select COM3 
M_mscomm. Put_InBufferSize (1024);//receive buffer 
M_mscomm. Put_OutBufferSize (1024);//send buffer 
M_mscomm. Put_InputLen (0);//set the current receiving data length is 0,, said all read 
M_mscomm. Put_InputMode (1);//read and write data in a binary way 
M_mscomm. Put_RThreshold (1);//receive buffer has more than 1 and 1 character, will trigger a receiving data OnComm events 
M_mscomm. Put_Settings (_T (" 9600, n, 8, 1 "));//baud rate test 9600, 8 bits a stop bit 
if(! M_mscomm. Get_PortOpen ()) 
{
M_mscomm. Put_PortOpen (TRUE);//open the serial port 
AfxMessageBox (_T (" serial port 3 open success ")); 
} 
The else 
{
M_mscomm. Put_OutBufferCount (0); 
AfxMessageBox (_T (" a serial port open 3 failure ")); 
} 
}

CodePudding user response:

Their Debug mode order step debugging see which call failed?

CodePudding user response:

M_mscomm. Advance put_Settings to m_mscomm. Try before put_PortOpen