QT5.6 下使用WinHTTP的GET 方法

在QT5.6下使用WinHTTP的GET方法，可以参考以下代码实现：

#include <windows.h>
#include <winhttp.h>

QByteArray httpGet(QString url)
{
    QByteArray result;
    HINTERNET hSession = NULL;
    HINTERNET hConnect = NULL;
    HINTERNET hRequest = NULL;

    // Open session
    hSession = WinHttpOpen(L"QT5.6 WinHTTP GET", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
    if (!hSession)
        return result;

    // Connect to server
    hConnect = WinHttpConnect(hSession, url.toStdWString().c_str(), INTERNET_DEFAULT_HTTP_PORT, 0);
    if (!hConnect)
        goto cleanup;

    // Open request
    hRequest = WinHttpOpenRequest(hConnect, L"GET", url.right(url.size() - url.lastIndexOf("/") - 1).toStdWString().c_str(), NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, 0);
    if (!hRequest)
        goto cleanup;

    // Send request
    if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0))
        goto cleanup;

    // Receive response
    if (!WinHttpReceiveResponse(hRequest, NULL))
        goto cleanup;

    // Read response
    DWORD dwSize = 0;
    do {
        char buffer[1024];
        if (!WinHttpReadData(hRequest, buffer, sizeof(buffer), &dwSize))
            goto cleanup;
        result.append(buffer, dwSize);
    } while (dwSize > 0);

    cleanup:
    if (hRequest)
        WinHttpCloseHandle(hRequest);
    if (hConnect)
        WinHttpCloseHandle(hConnect);
    if (hSession)
        WinHttpCloseHandle(hSession);

    return result;
}

这段代码使用WinHTTP库实现了一个简单的GET请求，将返回的数据存储在QByteArray中并返回。你可以将url传入函数中，函数将返回请求到的数据。