我知道如何下载html / txt页面.例如 :
//Variables DWORD dwSize = 0; DWORD dwDownloaded = 0; LPSTR pszOutBuffer; vector <string> vFileContent; BOOL bResults = FALSE; HINTERNET hSession = NULL,hConnect = NULL,hRequest = NULL; // Use WinHttpOpen to obtain a session handle. hSession = WinHttpOpen( L"WinHTTP Example/1.0",WINHTTP_ACCESS_TYPE_DEFAULT_PROXY,WINHTTP_NO_PROXY_NAME,WINHTTP_NO_PROXY_BYPASS,0); // Specify an HTTP server. if (hSession) hConnect = WinHttpConnect( hSession,L"nytimes.com",INTERNET_DEFAULT_HTTP_PORT,0); // Create an HTTP request handle. if (hConnect) hRequest = WinHttpOpenRequest( hConnect,L"GET",L"/ref/multimedia/podcasts.html",NULL,WINHTTP_NO_REFERER,NULL); // Send a request. if (hRequest) bResults = WinHttpSendRequest( hRequest,WINHTTP_NO_ADDITIONAL_HEADERS,WINHTTP_NO_REQUEST_DATA,0); // End the request. if (bResults) bResults = WinHttpReceiveResponse( hRequest,NULL); // Keep checking for data until there is nothing left. if (bResults) do { // Check for available data. dwSize = 0; if (!WinHttpQueryDataAvailable( hRequest,&dwSize)) printf( "Error %u in WinHttpQueryDataAvailable.\n",GetLastError()); // Allocate space for the buffer. pszOutBuffer = new char[dwSize+1]; if (!pszOutBuffer) { printf("Out of memory\n"); dwSize=0; } else { // Read the Data. ZeroMemory(pszOutBuffer,dwSize+1); if (!WinHttpReadData( hRequest,(LPVOID)pszOutBuffer,dwSize,&dwDownloaded)) { printf( "Error %u in WinHttpReadData.\n",GetLastError()); } else { printf("%s",pszOutBuffer); // Data in vFileContent vFileContent.push_back(pszOutBuffer); } // Free the memory allocated to the buffer. delete [] pszOutBuffer; } } while (dwSize>0); // Report any errors. if (!bResults) printf("Error %d has occurred.\n",GetLastError()); // Close any open handles. if (hRequest) WinHttpCloseHandle(hRequest); if (hConnect) WinHttpCloseHandle(hConnect); if (hSession) WinHttpCloseHandle(hSession); // Write vFileContent to file ofstream out("test.txt",ios::binary); for (int i = 0; i < (int) vFileContent.size();i++) out << vFileContent[i]; out.close();
当我尝试下载图片时,我只得到文件的第一行,没有错误信息.问题似乎与WinHttpOpenRequest函数中的此参数(ppwszAcceptTypes)有关.