分类: C/C++
2008-02-18 16:01:46
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; }