COM does not work with RDP

[Otto]

We have installed our application remote.

But now we face the problem that com1 forwarding with Fivewin does not work with RemoteDesktop.
We tested forwarding with other software and there the Com1 forwarding works.
Is there any solution?
Best regards,
Otto

[Antonio Linares]

Otto,

FWH uses standard Windows API CreateFile() to access the COM port and according to these docs:

http://support.microsoft.com/kb/259131

\\.\Global\DEVICEX should be used instead of \\.\DEVICEX

Try to use "\Global\COM1" instead of "COM1"

[Otto]

Hello Antonio,
thank you for your help.
If I try to use \Global\COM1 I get a BuildCommDcb Error.

Best regards,
Otto

[Antonio Linares]

Otto,

Please try this one:

"\\.\COM1"

[Otto]

Hello Antonio,
I tried but with no success.
Best regards,
Otto

[Antonio Linares]

Otto,

Is it a printer what you are trying to access ?

[Otto]

Hello Antonio,
it is an
Addimat key reader a user identification for any POS system.
I have a cpp test program which is working.
This program uses following code to open the port.
Where do I find the source in xHarbour/FW to check if the values are identically?
Best regards,
Otto

Code: Select all  Expand view

int ComOpen(unsigned Nr,int Baud,int Parity,int Stopbits,int Databits)
{
static const int    iPMode[]={NOPARITY,EVENPARITY,ODDPARITY,SPACEPARITY,MARKPARITY};
static const int    iSMode[]={ONESTOPBIT,ONE5STOPBITS,TWOSTOPBITS,ONESTOPBIT};
TCHAR               cName[]=Z("\\\\.\\COM1");
HANDLE              hFile;
COMMTIMEOUTS        sTo;
DCB                 sDcb;



    if(Nr>=MAX_COM_PORTS)return 0;
    if(bIsOpen[Nr])return 0;


    cName[7]='1'+Nr;

       hFile= CreateFile(cName,GENERIC_READ|GENERIC_WRITE,0,0,OPEN_EXISTING,FILE_ATTRIBUTE_NORMAL,0);
    if(hFile==INVALID_HANDLE_VALUE)
        {
        hFile=0;
        return 0;
        }

    if(Databits==7)Databits=0;


    memset(&sDcb,0,sizeof(sDcb));
    sDcb.DCBlength=sizeof(sDcb);
    sDcb.BaudRate       = Baud;
    sDcb.fParity        = (Parity!=0)? TRUE:FALSE;
    sDcb.fBinary        = TRUE;
    sDcb.Parity         = iPMode[Parity];
    sDcb.StopBits       = iSMode[Stopbits&3];
    sDcb.fOutxCtsFlow   = FALSE;
    sDcb.fOutxDsrFlow   = FALSE;
    sDcb.fDtrControl    = DTR_CONTROL_ENABLE;
    sDcb.fRtsControl    = RTS_CONTROL_ENABLE;
    sDcb.fDsrSensitivity= FALSE;
    sDcb.fAbortOnError  = FALSE;
    sDcb.ByteSize       = (Databits)? 8:7;

    if(!SetCommState(hFile,&sDcb))
        {
        CloseHandle(hFile);
        return 0;
        }


    sTo.ReadIntervalTimeout        = MAXDWORD;      // 0 ms Read-Tomeout
    sTo.ReadTotalTimeoutMultiplier = 0;
    sTo.ReadTotalTimeoutConstant   = 0;
    sTo.WriteTotalTimeoutMultiplier= 12000/Baud+1;  // ? ms Write timeout per byte
    sTo.WriteTotalTimeoutConstant  = sTo.WriteTotalTimeoutMultiplier+1;
    if(!SetCommTimeouts((HANDLE)hFile,&sTo))
        {
        CloseHandle(hFile);
        return 0;
        }


    hComFile[Nr]=hFile;
    bIsOpen [Nr]=TRUE;


return 1;
}
 

Best regards,
Otto

[Antonio Linares]

Otto,

FWH\source\winapi\comm.c

[Antonio Linares]

Otto,

FWH is using FILE_ATTRIBUTE_NORMAL | FILE_FLAG_OVERLAPPED instead of FILE_ATTRIBUTE_NORMAL (in your example).

Not sure if this may be a significant difference.

[Otto]

Hello Antonio,

can you please send me comm.c. I have not downloaded xHarbour sources.
I will try then.
Best regards,
Otto