C++下载IE缓存大文件

方式一、原来用

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1	ShellExecute

直接打开浏览器的方式，可以直接下载缓存中的文件

可是不能用于UI交互，而且用户能看到url地址

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CString strUrl = “url。。。” CString strPrama; strPrama.Format(_T("?programId=%d&orgCode=%s&fileName=%s"), m_id     , get_torg_code(), m_name); ShellExecute(NULL, _T("open"),  strUrl + strPrama, NULL, NULL, SW_SHOWNORMAL);

　　方式二，用URLDownloadToFile，下载小文件还行，文件一旦过大（具体数字没有查看，没有查找瓶颈）可以下载100多KB的，下载299KB就失败

DeleteUrlCacheEntry(strPathUrl);

HRESULT hr = URLDownloadToFile(NULL, strUrl, stLocalFile, 0, NULL);

 

方式三，用curl，可以下载缓存，可以下载具体路径的

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类中声明     BOOL CurlDownloadFile(CString strLocalFile);     static size_t DealReqReply(void *buffer, size_t size, size_t nmemb, void *userp);    //下载文件数据接收函数     回调函数需要是static或者全局函数

　　

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BOOL CDlgXXXX::CurlDownloadFile(CString strLocalFile) {     BOOL bRet = FALSE;       string szLocalFile = CStringFun::wstring_to_string(strLocalFile.GetBuffer(0));     strLocalFile.ReleaseBuffer();     FILE *fp = fopen(szLocalFile.c_str(), "wb");     if (fp == NULL)     {         return bRet;     }       CURL *curl = curl_easy_init();     struct curl_httppost *formpost = NULL;     struct curl_httppost *lastptr = NULL;       char cId[16] = {0};     _itoa_s(m_project->m_id, cId, 16, 10);     curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "programId", CURLFORM_COPYCONTENTS, cId, CURLFORM_END);       CString strOrg = m_zj_libmgr->get_torg_code();     string szOrg = CStringFun::wstring_to_string(strOrg.GetBuffer());     strOrg.ReleaseBuffer();     curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "orgCode", CURLFORM_COPYCONTENTS, szOrg.c_str(), CURLFORM_END);       string szName = CStringFun::wstring_to_string(gZJHome->m_project->m_name.GetBuffer());     m_project->m_name.ReleaseBuffer();     curl_formadd(&formpost, &lastptr, CURLFORM_COPYNAME, "fileName", CURLFORM_COPYCONTENTS, szName.c_str(), CURLFORM_END);       CString strUrl =get_post_url(purl_get_version_url);     string szUrl = CStringFun::wstring_to_string(strUrl.GetBuffer(0));     strUrl.ReleaseBuffer();     curl_easy_setopt(curl, CURLOPT_URL, szUrl.c_str());     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, FALSE);     curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, FALSE);     curl_easy_setopt(curl, CURLOPT_HTTPPOST, formpost);     curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &DealReqReply);     curl_easy_setopt(curl, CURLOPT_WRITEDATA, fp);       CURLcode res = curl_easy_perform(curl);     curl_formfree(formpost);     curl_easy_cleanup(curl);     fclose(fp);       if(res == CURLE_OK)     {         bRet = TRUE;     }       return bRet; }   size_t CDlgXXXX::DealReqReply(void *buffer, size_t size, size_t nmemb, void *userp) {     FILE *fp = (FILE *)userp;     size_t return_size = fwrite(buffer, size, nmemb, fp);     return return_size; }

　　使用

void CDlgXXXX::OnBnClickedDown()
{
    CString strName = m_project->m_name;
    strName.Replace(_T(":"), _T("-"));
    strName.Replace(_T("/"), _T("-"));

    CFileDialog dlg(FALSE, _T("*.xls"), strName, OFN_HIDEREADONLY | OFN_OVERWRITEPROMPT, _T("Excel Files (*.xls)|*.xls||"));
    if(dlg.DoModal() == IDOK)
    {
        CWaitCursor cur;
        m_btn_down_.EnableWindow(FALSE);
        CString strLocalFile = dlg.GetPathName();
        BOOL bRet = CurlDownloadFile(strLocalFile);
        if (bRet)
        {
            ShellExecute(NULL, _T("open"),  dlg.GetFolderPath(), NULL, NULL, SW_SHOWNORMAL);
        }
        else
        {
            CString strUrl = get_post_url(purl_get_version_url);
            CString strPrama;
            strPrama.Format(_T("?programId=%d&orgCode=%s&fileName=%s"), m_id
                , get_torg_code(), m_name);
            ShellExecute(NULL, _T("open"),  strUrl + strPrama, NULL, NULL, SW_SHOWNORMAL);
        }
        m_btn_down_.EnableWindow(TRUE);        
    }    
}