Microsoft KB Archive/178851

= How To Enumerate Channels in Internet Explorer 4.0 =

Article ID: 178851

Article Last Modified on 7/1/2004

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APPLIES TO


 * Microsoft Internet Explorer 4.0 128-Bit Edition
 * Microsoft Internet Explorer 4.01 Service Pack 2

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This article was previously published under Q178851



SUMMARY
With the introduction of Active Channels in Internet Explorer 4.0, it may be desirable to enumerate all the channels installed in a system. This article demonstrates how to do this correctly using the new IChannelMgr and IEnumChannels interfaces documented in the Internet Client SDK.



MORE INFORMATION
The following code enumerates the channels using the two interfaces, IChannelMgr and IEnumChannels, and adds every channel element retrieved into a listbox: #define INITGUID #include   #include    #include       // This .h file defines the 2 interfaces

CListBox *pList; HRESULT hr; IChannelMgr  *pChannelMgr; IEnumChannels *pIEnumChannels;

pList = (CListBox*)GetDlgItem(IDC_LIST1); if (FAILED(hr = CoInitialize(NULL))) return FALSE;

hr = CoCreateInstance(CLSID_ChannelMgr,                        NULL,                         CLSCTX_INPROC_SERVER,                         IID_IChannelMgr,                         (void**)&pChannelMgr);

hr = pChannelMgr->EnumChannels(CHANENUM_CHANNELFOLDER |                                 CHANENUM_TITLE |                                  CHANENUM_PATH |                                  CHANENUM_URL,                                  NULL,                                  &pIEnumChannels); if (SUCCEEDED(hr)) {     ASSERT(pIEnumChannels); CHANNELENUMINFO ci;

while (S_OK == pIEnumChannels->Next(1, &ci, NULL)) {         // Do something with the path here. TCHAR szTitle[200]; TCHAR szPath[200]; TCHAR szURL[200]; TCHAR szBuffer[500];

WideCharToMultiByte(CP_ACP, 0, ci.pszTitle, -1, szTitle, 200,                             NULL,                              NULL); WideCharToMultiByte(CP_ACP, 0, ci.pszPath, -1, szPath, 200, NULL,                             NULL); WideCharToMultiByte(CP_ACP, 0, ci.pszURL, -1, szURL, 200, NULL,                             NULL); //TRACE ("%s + %s + %s\r\n", szTitle, szPath, szURL);

wsprintf (szBuffer,"%s (%s)",szTitle, szURL); pList->AddString (szBuffer);

CoTaskMemFree(ci.pszTitle); CoTaskMemFree(ci.pszPath); CoTaskMemFree(ci.pszURL); }  }

pIEnumChannels->Release; CoUninitialize;

