c# - GetUrlCacheEntryInfo 用法

Question

我试图打印出名为“GetUrlCacheEntryInfo”的函数给出的信息，但它不起作用，它只打印出调试日志中的一个字符。如何正确打印所有数据？

Answer 1

这是一个工作示例，带有我在缓存中找到的 url ( https://h6.msn.com/library/8.8/dapmsn.js )（因为我不使用 IE，这是我从FindFirstUrlCacheEntry.为什么你可以只打印一个字符的可能问题是你可能没有使用宽字符串打印函数. lpszSourceUrlNameandlpszLocalFileName字段是宽字符串字段，因此您应该相应地打印它们（参见下面示例中的std::coutand的用法）。std::wcout

#include <Windows.h>
#include <Wininet.h>

#include <memory>

#pragma comment(lib, "Wininet.lib")

#include <iostream>

bool GetUrlCacheEntryInfo(const wchar_t* pUrl, std::unique_ptr<unsigned char[]>& pUrlCacheEntryInfo, DWORD nBufferSize = sizeof(INTERNET_CACHE_ENTRY_INFO))
{
    std::unique_ptr<unsigned char[]> pTemporaryUrlCacheEntryInfo(new unsigned char[nBufferSize]);
    if (GetUrlCacheEntryInfo(pUrl, reinterpret_cast<LPINTERNET_CACHE_ENTRY_INFO>(pTemporaryUrlCacheEntryInfo.get()), &nBufferSize) == FALSE)
    {
        const DWORD nError = GetLastError();
        if (nError == ERROR_INSUFFICIENT_BUFFER)
        {
            pTemporaryUrlCacheEntryInfo.reset(new unsigned char[nBufferSize]);
            if (GetUrlCacheEntryInfo(pUrl, reinterpret_cast<LPINTERNET_CACHE_ENTRY_INFO>(pTemporaryUrlCacheEntryInfo.get()), &nBufferSize) == FALSE)
            {
                return false;
            }
        }
        else
        {
            return false;
        }
    }
    pUrlCacheEntryInfo = std::move(pTemporaryUrlCacheEntryInfo);
    return true;
}

void PrintUrlCacheEntryInfo(LPINTERNET_CACHE_ENTRY_INFO pUrlCacheEntryInfo)
{
    std::cout << "Cache Entry Info:\n\tSize: " << pUrlCacheEntryInfo->dwStructSize << "\n\tUrl: ";
    std::wcout << pUrlCacheEntryInfo->lpszSourceUrlName;
    std::cout << "\n\tLocal File:";
    std::wcout << pUrlCacheEntryInfo->lpszLocalFileName;
    std::cout << "\n\tType: ";
    switch (pUrlCacheEntryInfo->CacheEntryType)
    {
    case EDITED_CACHE_ENTRY:
        std::cout << "EDITED_CACHE_ENTRY";
        break;
    case SPARSE_CACHE_ENTRY:
        std::cout << "SPARSE_CACHE_ENTRY";
        break;
    case STICKY_CACHE_ENTRY:
        std::cout << "STICKY_CACHE_ENTRY";
        break;
    case TRACK_OFFLINE_CACHE_ENTRY:
        std::cout << "TRACK_OFFLINE_CACHE_ENTRY";
        break;
    case TRACK_ONLINE_CACHE_ENTRY:
        std::cout << "TRACK_ONLINE_CACHE_ENTRY";
        break;
    default:
        std::cout << "UNKNOWN";
        break;
    }
    std::cout << "\n\tHeaders: ";
    std::wcout << pUrlCacheEntryInfo->lpHeaderInfo;
    std::cout << "\n";
}

int main(int argc, char** argv)
{
    const wchar_t* pUrl = L"https://h6.msn.com/library/8.8/dapmsn.js";
    std::unique_ptr<unsigned char[]> pUrlCacheEntryInfo;
    if (GetUrlCacheEntryInfo(pUrl, pUrlCacheEntryInfo))
    {
        PrintUrlCacheEntryInfo(reinterpret_cast<LPINTERNET_CACHE_ENTRY_INFO>(pUrlCacheEntryInfo.get()));
    }
    else
    {
        std::wcout << L"Cache entry for url " << pUrl << L" was  not found!\n";
    }
    return EXIT_SUCCESS;
}