DVB Owners Discussion Forum - dvbowners.com > GetDisplayName not working properly

Full Version: GetDisplayName not working properly

DVB Owners Discussion Forum - dvbowners.com > Technical & Development Forums > BDA Driver Development

nate

Jul 11 2004, 09:53 AM

I've started looking at how to uniquely identify cards so i can make it possible to select which cards to use and i figured the string returned IMoniker::GetDisplayName would do the job nicely. The only problem is i can't get it to return the full string.

CODE

HRESULT hr = S_OK;
CComPtr <IEnumMoniker> pEnum;
CComPtr <ICreateDevEnum> pSysDevEnum;
CComPtr <IMoniker> pMoniker;

hr = pSysDevEnum.CoCreateInstance(CLSID_SystemDeviceEnum)

hr = pSysDevEnum->CreateClassEnumerator(clsidDeviceClass, &pEnum, 0);

while(pEnum->Next(1, &pMoniker, 0) == S_OK)
{
    LPOLESTR pStr;
    IBindCtx *pBindCtx;
    hr = CreateBindCtx(0, &pBindCtx);

    hr = pMoniker->GetDisplayName(pBindCtx, NULL, &pStr);

    pMoniker.Release();
}
pEnum.Release();
pSysDevEnum.Release();

graphedt.exe shows the full string in the insert filter dialog but when i run this code pStr always comes out with the end chopped off.
@device:pnp:\\?\pci#ven_109e&dev_036e&subsys_00011822&rev_11#3&61aaa01&0&40#{71985f48-1ca1-11d3-9cc8-00c04f7971e0}\{4e603

Has anyone else done this and had the same problem? or can you point out what i'm doing wrong?

Spectrum

Jul 11 2004, 11:09 AM

I don't actually know, but a google search came up with this code sample http://www.alexfedotov.com/samples/enumrot.asp.

Spectrum

JoeyBloggs

Jul 11 2004, 03:36 PM

Seems to work ok for me ~

alternatively, you could use piPropertyBag->Read(L"DevicePath", &varName, 0);

CODE

USES_CONVERSION;

HRESULT hr = S_OK;

IBindCtx* � � �piBindCtx � � � � � = NULL;
IMoniker* � � �piMoniker � � � � � = NULL;
IPropertyBag* �piPropertyBag � � � = NULL;

LPOLESTR � � � pszDisplayName � � �= NULL;

CString � � � �sMonikerDisplayName = _T("");

hr = ::CreateBindCtx(NULL, &piBindCtx);

if (SUCCEEDED(hr))
{
    hr = piMoniker->GetDisplayName(piBindCtx, NULL, &pszDisplayName);

    sMonikerDisplayName = OLE2T(pszDisplayName);

    CoTaskMemFree(pszDisplayName);

    //////////////

    hr = piMoniker->BindToStorage(0, 0, IID_IPropertyBag, reinterpret_cast<void**>(&piPropertyBag) );

    if (SUCCEEDED(hr))
    {
�CString sFriendlyName = _T("");
�CString sDescription �= _T("");
�CString sDevicePath � = _T("");

�// To retrieve the filter's friendly name, do the following:
�VARIANT varName;
�VariantInit(&varName);

�hr = piPropertyBag->Read(L"FriendlyName", &varName, 0);
�
�if (SUCCEEDED(hr))
�{
�    sFriendlyName = varName.bstrVal; // O2T conversion
�}
�
�VariantClear(&varName);

�hr = piPropertyBag->Read(L"Description", &varName, 0);
�
�if (SUCCEEDED(hr))
�{
�    sDescription = varName.bstrVal; // O2T conversion
�}
�
�VariantClear(&varName);

�hr = piPropertyBag->Read(L"DevicePath", &varName, 0);
�
�if (SUCCEEDED(hr))
�{
�    sDevicePath = varName.bstrVal; // O2T conversion
�}
�
�VariantClear(&varName);

�MYTRACE("Found %s %s %s\n", sMonikerDeviceClass, sFriendlyName, sDevicePath);
�MYTRACE("DisplayName = %s\n", sMonikerDisplayName);

�piPropertyBag->Release();
    }
}

piBindCtx->Release();

nate

Jul 11 2004, 11:21 PM

Thanks Joey, i'll give it a try, but i have to ask, how did you find out what the names were for the IPropertyBag Reads?

I spent a couple of hours searching trying to find a list of values and the only thing i came up with was using the IPropertyBag2 interface to get the list, only when i tried it i found that the IPropertyBag2 interface wasn't supported by the IMonker for the tuner.

JoeyBloggs

Jul 12 2004, 12:20 AM

Yup I went down the same path with IPropertyBag2

I don't really remember where I found the property names probably from here ~ http://msdn.microsoft.com/archive/default....pturedevice.asp

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