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C++ WinHttp連接超時(shí)設(shè)置方法

c++
小樊
85
2024-08-29 16:51:52
欄目: 編程語言

在C++中，使用WinHttp庫進(jìn)行HTTP請求時(shí)，可以通過設(shè)置WINHTTP_OPTION_CONNECT_TIMEOUT和WINHTTP_OPTION_RECEIVE_TIMEOUT選項(xiàng)來控制連接超時(shí)和接收數(shù)據(jù)超時(shí)。

以下是一個簡單的示例，展示了如何設(shè)置這些超時(shí)選項(xiàng)：

#include<iostream>
#include<Windows.h>
#include <winhttp.h>

int main() {
    // 初始化WinHttp
    HINTERNET hSession = WinHttpOpen(L"MyUserAgent", WINHTTP_ACCESS_TYPE_DEFAULT_PROXY, WINHTTP_NO_PROXY_NAME, WINHTTP_NO_PROXY_BYPASS, 0);
    if (!hSession) {
        std::cerr << "Error: WinHttpOpen failed."<< std::endl;
        return 1;
    }

    // 設(shè)置連接超時(shí)（毫秒）
    DWORD connectTimeout = 5000; // 5 seconds
    if (!WinHttpSetOption(hSession, WINHTTP_OPTION_CONNECT_TIMEOUT, &connectTimeout, sizeof(connectTimeout))) {
        std::cerr << "Error: WinHttpSetOption (WINHTTP_OPTION_CONNECT_TIMEOUT) failed."<< std::endl;
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 設(shè)置接收數(shù)據(jù)超時(shí)（毫秒）
    DWORD receiveTimeout = 10000; // 10 seconds
    if (!WinHttpSetOption(hSession, WINHTTP_OPTION_RECEIVE_TIMEOUT, &receiveTimeout, sizeof(receiveTimeout))) {
        std::cerr << "Error: WinHttpSetOption (WINHTTP_OPTION_RECEIVE_TIMEOUT) failed."<< std::endl;
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 創(chuàng)建連接
    HINTERNET hConnect = WinHttpConnect(hSession, L"example.com", INTERNET_DEFAULT_HTTPS_PORT, 0);
    if (!hConnect) {
        std::cerr << "Error: WinHttpConnect failed."<< std::endl;
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 創(chuàng)建請求
    HINTERNET hRequest = WinHttpOpenRequest(hConnect, L"GET", L"/path/to/resource", NULL, WINHTTP_NO_REFERER, WINHTTP_DEFAULT_ACCEPT_TYPES, WINHTTP_FLAG_SECURE);
    if (!hRequest) {
        std::cerr << "Error: WinHttpOpenRequest failed."<< std::endl;
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 發(fā)送請求
    if (!WinHttpSendRequest(hRequest, WINHTTP_NO_ADDITIONAL_HEADERS, 0, WINHTTP_NO_REQUEST_DATA, 0, 0, 0)) {
        std::cerr << "Error: WinHttpSendRequest failed."<< std::endl;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 接收響應(yīng)
    if (!WinHttpReceiveResponse(hRequest, NULL)) {
        std::cerr << "Error: WinHttpReceiveResponse failed."<< std::endl;
        WinHttpCloseHandle(hRequest);
        WinHttpCloseHandle(hConnect);
        WinHttpCloseHandle(hSession);
        return 1;
    }

    // 處理響應(yīng)...

    // 清理資源
    WinHttpCloseHandle(hRequest);
    WinHttpCloseHandle(hConnect);
    WinHttpCloseHandle(hSession);

    return 0;
}

在這個示例中，我們首先使用WinHttpOpen函數(shù)初始化一個WinHttp會話。然后，我們使用WinHttpSetOption函數(shù)設(shè)置連接超時(shí)和接收數(shù)據(jù)超時(shí)。接下來，我們創(chuàng)建一個連接并打開一個請求，然后發(fā)送請求并接收響應(yīng)。最后，我們關(guān)閉所有打開的句柄并返回。

注意：在實(shí)際應(yīng)用程序中，你可能需要根據(jù)需要調(diào)整超時(shí)值。

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