判断IE的缓冲文件存储的位置并取得该文件

最新推荐文章于 2021-05-31 10:20:10 发布

原创最新推荐文章于 2021-05-31 10:20:10 发布 · 4.3k 阅读

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文章标签：

#存储 #ie #cache #delete #null #winapi

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博客介绍了使用WinAPI枚举IE缓存条目的方法。需将Wininet.lib加到工程里，通过FindFirstUrlCacheEntry和FindNextUrlCacheEntry函数来遍历缓存条目，处理可能出现的错误，如缓冲区不足等情况，并统计缓存条目数量。

将Wininet.lib加到工程里去
int WINAPI EnumerateCacheOld(HWND hX)
{
    DWORD dwEntrySize;
    LPINTERNET_CACHE_ENTRY_INFO lpCacheEntry;
    DWORD MAX_CACHE_ENTRY_INFO_SIZE=4096;
    HANDLE hCacheDir;
    int nCount=0;

    SendDlgItemMessage(hX,IDC_CacheList,LB_RESETCONTENT,0,0);

    SetCursor(LoadCursor(NULL,IDC_WAIT));

    dwEntrySize = MAX_CACHE_ENTRY_INFO_SIZE;
    lpCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO) new char[dwEntrySize];
    lpCacheEntry->dwStructSize = dwEntrySize;

again:

    if (!(hCacheDir = FindFirstUrlCacheEntry(NULL,lpCacheEntry,&dwEntrySize)))
    {
        delete[]lpCacheEntry;
        switch(GetLastError())
        {
            case ERROR_NO_MORE_ITEMS:
                char tempout[80];
                sprintf(tempout,"The number of cache entries = %d /n",nCount);
                MessageBox(hX,tempout,"Cache Enumeration",MB_OK);
                FindCloseUrlCache(hCacheDir);
                SetCursor(LoadCursor(NULL,IDC_ARROW));
                return TRUE;
                break;
            case ERROR_INSUFFICIENT_BUFFER:
                lpCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO)
                                new char[dwEntrySize];
                lpCacheEntry->dwStructSize = dwEntrySize;
                goto again;
                break;
            default:
                ErrorOut(hX,GetLastError(),"FindNextUrlCacheEntry Init");
                FindCloseUrlCache(hCacheDir);
                SetCursor(LoadCursor(NULL,IDC_ARROW));
                return FALSE;
        }
    }

SendDlgItemMessage(hX,IDC_CacheList,LB_ADDSTRING,
                                0,(LPARAM)(lpCacheEntry->lpszSourceUrlName));
        nCount++;
        delete (lpCacheEntry);

        do
        {
                dwEntrySize = MAX_CACHE_ENTRY_INFO_SIZE;
                lpCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO) new char[dwEntrySize];
                lpCacheEntry->dwStructSize = dwEntrySize;

retry:
                if (!FindNextUrlCacheEntry(hCacheDir,lpCacheEntry, &dwEntrySize))
                {
                        delete[]lpCacheEntry;
                        switch(GetLastError())
                        {
                                case ERROR_NO_MORE_ITEMS:
                                        char tempout[80];
                                        sprintf(tempout,"The number of cache entries =
                                                %d /n",nCount);
                                        MessageBox(hX,tempout,"Cache Enumeration",MB_OK);
                                        FindCloseUrlCache(hCacheDir);
                                        return TRUE;
                                        break;
                                case ERROR_INSUFFICIENT_BUFFER:
                                        lpCacheEntry = (LPINTERNET_CACHE_ENTRY_INFO)
                                                        new char[dwEntrySize];
                                        lpCacheEntry->dwStructSize = dwEntrySize;
                                        goto retry;
                                        break;
                                default:
                                        ErrorOut(hX,GetLastError(),"FindNextUrlCacheEntry Init");
                                        FindCloseUrlCache(hCacheDir);
                                        return FALSE;
                        }
                }

SendDlgItemMessage(hX,IDC_CacheList,LB_ADDSTRING,
                                        0,(LPARAM)(lpCacheEntry->lpszSourceUrlName));
                nCount++;
                delete[] lpCacheEntry;
        }
        while (TRUE);

SetCursor(LoadCursor(NULL,IDC_ARROW));
return TRUE;
}