CppRestSDK Как отправлять составные данные POST

Поскольку по какой-то причине это получает несколько голосов, я хотел бы ответить на вопрос.

Я решил это давно, вы можете проверить мой репозиторий, чтобы узнать, как именно.

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

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

Наслаждайтесь решением.

Вот как это можно сделать:

// 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 << "\r\n"
                << "Content-Disposition: form-data; name=\"" << key << "\"\r\n\r\n"
                << value << "\r\n";
}
// 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<<"\r\n"
            << "Content-Disposition: form-data; name=\"image\"; filename=\"" << imageFilename << "\"\r\n"
            << "Content-Type: " << contentType << "\r\n\r\n"
            << imgContent.str() << "\r\n"
            << "--" << 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);