CppRestSDK 如何发布多部分数据

CppRestSDK How to POST multipart data

本文关键字：数据 多部 何发布 CppRestSDK      更新时间：2023-10-16

我正在尝试将多部分数据发布到服务器，我正在从CPR切换到CPPRestSDK，但我似乎找不到任何文档

来自心肺复苏术，https://github.com/whoshuu/cpr

这意味着我已经尝试了该代码，但我似乎找不到有关 cpprestsdk 的任何多部分数据文档。

    cpr::Multipart multipart_data{};
    for (size_t i = 0; i < files.size(); i++) {
        if (!is_image_or_gif(files[i].filepath)) {
            std::string entire_file = read_entire_file(files[i].filepath);
            std::string custom_filename{ files[i].spoiler ? "SPOILER_" : "" };
            multipart_data.parts.emplace_back(
                "file" + std::to_string(i),
                cpr::Buffer{ entire_file.begin(),
                             entire_file.end(),
                             custom_filename + files[i].filename },
                "application/octet-stream");
        } else {
            multipart_data.parts.emplace_back("file" + std::to_string(i),
                                              cpr::File(files[i].filepath),
                                              "application/octet-stream");
        }
    }
    auto payload_json = nlohmann::json{
        { "content", content },
        { "tts", tts }
    }.dump();
    multipart_data.parts.emplace_back("payload_json", payload_json);
    auto response = cpr::Post(
        cpr::Url{ endpoint("/channels/%/messages", id) },
        cpr::Header{ { "Authorization", format("Bot %", discord::detail::bot_instance->token) },
                     { "Content-Type", "multipart/form-data" },
                     { "User-Agent", "DiscordBot (http://www.github.com/yuhanun/dpp, 0.0.0)" },
                     { "Connection", "keep-alive" } },
        multipart_data);

file结构非常明显的地方。

标题，很好，我想通了，我只需要一些帮助发送多部分数据基本上:)

我的预期结果是让服务器使用"成功"json(在本例中为已发送消息的消息对象(进行响应，但是，现在，我什至不知道从哪里开始。

由于出于某种原因，这得到了一些赞成票，我想回答这个问题。

我很久以前就解决了这个问题，您可以查看我的存储库以了解确切的方法。

https://github.com/Yuhanun/DPP/blob/master/src/channel.cpp#L108

https://github.com/Yuhanun/DPP/blob/master/src/utils.cpp#L180

享受解决方案。

这是

可以做到的：

// Form a multipart/form-data scheme 
// 1.Create a boundary ( a random value that you know is unique)
// KabezOf... is something goofie I just wrote, make sure you use 
// something that you know does not exist in  the actual messages.
std::string boundary = "----KabezOfFireDegelDegelGoGoniDaijobo";
// 2.Embed different fields 
std::stringstream bodyContent;
std::map<std::string, std::string> keyValues{ {"key1", "value1"},
                                              {"key2", "value2"},
                                              {"key3", "value3" } };
for (auto& [key, value] : keyValues)
{
    bodyContent << "--" << boundary << "rn"
                << "Content-Disposition: form-data; name="" << key << ""rnrn"
                << value << "rn";
}
// 3. if you have any files to send as well, Now is the time
// here we are sending an image file, as you can see, like
// previous block, you can put this into a loop and instead
// of 1 file, have several files.
// reading the image 
std::ifstream inputFile;
inputFile.open(imagePath, std::ios::binary | std::ios::in);
std::ostringstream imgContent;
std::copy(std::istreambuf_iterator<char>(inputFile),
          std::istreambuf_iterator<char>(),
          std::ostreambuf_iterator<char>(imgContent));
auto imageFilename =  std::filesystem::path(imagePath).filename().string();
bodyContent << "--" << boundary<<"rn"
            << "Content-Disposition: form-data; name="image"; filename="" << imageFilename << ""rn"
            << "Content-Type: " << contentType << "rnrn"
            << imgContent.str() << "rn"
            << "--" << boundary << "--";
web::http::client::http_client client(your_uri);
web::http::http_request requestMessage{ methods::POST };
requestMessage.set_body(bodyContent.str(), "multipart/form-data; boundary=" + boundary);
auto result = client.request(requestMessage);
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