Delete Temporary Internet Files 

In IE5, you can delete Temporary Internet Files in "Internet Options" property sheet. Do you ever wonder how to delete Temporary Internet Files in your application? Here is how it can be done by using WinInet APIs: FindFirstUrlCacheEntry, FindNextUrlCacheEntry, DeleteUrlCacheEntry, and FindCloseUrlCache. 

It is not documented, but I have tested it and it works, with VC++ 6.0 on Win98/NT. 

#include 

//

// Delete all files in the Temporary Internet Files folder

// 

// Note that you can specify what NOT to delete by testing entry type

// In code below, cookie entries are not deleted

// [see if (!(lpCacheEntry->CacheEntryType & COOKIE_CACHE_ENTRY))]

// 

BOOL DelTempFiles() 

{

    BOOL bResult = FALSE;

    BOOL bDone = FALSE;

    LPINTERNET_CACHE_ENTRY_INFO lpCacheEntry = NULL;  

    DWORD  dwTrySize, dwEntrySize = 4096; // start buffer size    

    HANDLE hCacheDir = NULL;    

    DWORD  dwError = ERROR_INSUFFICIENT_BUFFER;

    do 

    {                               

        switch (dwError)

        {

            // need a bigger buffer

            case ERROR_INSUFFICIENT_BUFFER: 

                delete [] lpCacheEntry;            

                lpCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO) new char[dwEntrySize];

                lpCacheEntry->dwStructSize = dwEntrySize;

                dwTrySize = dwEntrySize;

                BOOL bSuccess;

                if (hCacheDir == NULL)                

                    bSuccess = (hCacheDir 

                      = FindFirstUrlCacheEntry(NULL, lpCacheEntry,

                      &dwTrySize)) != NULL;

                else

                    bSuccess = FindNextUrlCacheEntry(hCacheDir, lpCacheEntry, &dwTrySize);

                if (bSuccess)

                    dwError = ERROR_SUCCESS;    

                else

                {

                    dwError = GetLastError();

                    dwEntrySize = dwTrySize; // use new size returned

                }

                break;

             // we are done

            case ERROR_NO_MORE_ITEMS:

                bDone = TRUE;

                bResult = TRUE;                

                break;

             // we have got an entry

            case ERROR_SUCCESS:                       

                // don't delete cookie entry

                if (!(lpCacheEntry->CacheEntryType & COOKIE_CACHE_ENTRY))                

                 DeleteUrlCacheEntry(lpCacheEntry->lpszSourceUrlName);

                // get ready for next entry

                dwTrySize = dwEntrySize;

                if (FindNextUrlCacheEntry(hCacheDir, lpCacheEntry, &dwTrySize))

                    dwError = ERROR_SUCCESS;          

                else

                {

                    dwError = GetLastError();

                    dwEntrySize = dwTrySize; // use new size returned

                }                    

                break;

            // unknown error

            default:

                bDone = TRUE;                

                break;

        }

        if (bDone)

        {   

            delete [] lpCacheEntry; 

            if (hCacheDir)

                FindCloseUrlCache(hCacheDir);         

        }

    } while (!bDone);

    return bResult;

}