WinInet异步InternetSetStatusCallback的回调函数问题
微软的代码，回调函数里面访问的hConnect、hRequest等都是全局变量。
而我想实现多文件同时下载或上传，希望回调函数访问类的成员（也就是每一个对象的）。
可是类成员函数不能做回调函数。
加上static又不能访问非静态成员变量。
纠结了，求指导，可能设计有问题。

C/C++ code

void __stdcall Callback(HINTERNET hInternet,              DWORD dwContext,              DWORD dwInternetStatus,              LPVOID lpStatusInfo,              DWORD dwStatusInfoLen){    cout << "Callback dwInternetStatus: " << dwInternetStatus << " Context: " << dwContext << endl;    cout.flush();    switch(dwContext)    {    case 1: // Connection handle        if (dwInternetStatus == INTERNET_STATUS_HANDLE_CREATED)        {            INTERNET_ASYNC_RESULT *pRes = (INTERNET_ASYNC_RESULT *)lpStatusInfo;            hConnect = (HINTERNET)pRes->dwResult;//hConnect全局            cout << "Connect handle created" << endl;            cout.flush();            SetEvent(hConnectedEvent);        }        break;    case 2: // Request handle        switch(dwInternetStatus)        {        case INTERNET_STATUS_HANDLE_CREATED:            {                INTERNET_ASYNC_RESULT *pRes = (INTERNET_ASYNC_RESULT *)lpStatusInfo;                hRequest = (HINTERNET)pRes->dwResult;//hRequest全局                cout << "Request handle created" << endl;                cout.flush();            }            break;        case INTERNET_STATUS_REQUEST_SENT:            {                DWORD *lpBytesSent = (DWORD*)lpStatusInfo;                cout << "Bytes Sent: " << *lpBytesSent << endl;                dwNumBytesComplete += *lpBytesSent;            }            break;        case INTERNET_STATUS_REQUEST_COMPLETE:            {                INTERNET_ASYNC_RESULT *pAsyncRes = (INTERNET_ASYNC_RESULT *)lpStatusInfo;                cout << "Function call finished" << endl;                cout << "dwResult: " << pAsyncRes->dwResult << endl;                cout << "dwError:  " << pAsyncRes->dwError << endl;                cout.flush();                SetEvent(hRequestCompleteEvent);            }            break;        case INTERNET_STATUS_RECEIVING_RESPONSE:            cout << "Receiving Response" << endl;            cout.flush();            break;        case INTERNET_STATUS_RESPONSE_RECEIVED:            {                DWORD *dwBytesReceived = (DWORD*)lpStatusInfo;                cout << "Received " << *dwBytesReceived << endl;                cout.flush();            }        }    }}

[解决办法]
用全局变量数组
[解决办法]
用 dwContext 传递指针
[解决办法]
http://hi.baidu.com/ljp2010/blog/item/d28932012134110b7bec2c15.html
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