ERROR_NOT_SUPPORTED in BiDiSpl.h using IBiDiSpl Interface

Hello,

I am trying to create some bidirectional communication with a printer, and I am having a little problem.

I was originally working with a HP Color LaserJet 2820, which does not support bidirectional communication, so the error that I was getting (ERROR_NOT_SUPPORTED), makes sense.

I've since switched to a Konica Minolta Magicolor 5450, which does support BiDi, yet I still get the same error. I would like to know if anyone has successfully implemented this interface with a bi-directional printer, or can assist me in doing so.

My code so far is:
The line with the error has a comment below it.

Code:

System::String^ BiDiTest::GetToner(System::String^ PrinterName, System::String^ valueRequired) 
{ 
    IBidiSpl        * pIBidiSpl = NULL;  
    IBidiRequest    * pIReq = NULL; 
    HRESULT hr = 0; 
     
    //Convert System::String^ to LPCWSTR ---------------------- 
    const wchar_t* chars = 
    (const wchar_t*)(Marshal::StringToHGlobalUni(PrinterName)).ToPointer(); 
    LPCWSTR name = chars; 
    //  ---------------------------------------------------- 
         
        DWORD dwAccess = BIDI_ACCESS_USER; 
         
        BSTR request = CString(mySchema).AllocSysString(); 
         
 
        DWORD Erroc = GetLastError(); 
         
        CoUninitialize(); 
        hr = CoInitializeEx (NULL, COINIT_MULTITHREADED); 
         
        hr = CoCreateInstance(CLSID_BidiSpl, NULL, CLSCTX_INPROC_SERVER, IID_IBidiSpl, 
                               (void**)&pIBidiSpl);  
         
        hr = pIBidiSpl->BindDevice(name, dwAccess); 
 
        hr = CoCreateInstance(CLSID_BidiRequest, 
                                NULL,  
                                CLSCTX_INPROC_SERVER, 
                                IID_IBidiRequest,  
                                (void**)&pIReq); 
 
        hr = pIReq->SetSchema (L"\\Printer.Layout.InputBins.Tray2:Installed"); 
 
        LPWSTR   pszSchema = NULL; 
        DWORD    dwType = NULL; 
        BYTE     *pData = NULL; 
        ULONG    uSize = NULL; 
        bool bDuplexInstalled; 
        BSTR* response = NULL; 
         
        hr = pIBidiSpl->SendRecv(BIDI_ACTION_GET, pIReq);
           // This is where I get the error....
 
        hr = pIReq->GetOutputData (0, &pszSchema, &dwType, &pData, &uSize); 
 
                             
        CoTaskMemFree (pData); 
 
        hr = pIBidiSpl->UnbindDevice (); 
 
        pIReq->Release(); 
        pIBidiSpl->Release(); 
        CoUninitialize(); 
         
             
    return PrinterName; 
}

Thanks in advance.

I think the author of the component you're calling would be able to help more. This is a general purpose C++ forum.

I've talked to Microsoft (they're the author), no help there. I've posted on a plethora of forums across the web and no one has an answer.

Who created the component? Ask them. If Microsoft did not create the component then I'm not surprised they did not help you.

Microsoft created it.