问题

我想在C++ libcurl中使用Discord webhook发送消息。所以我写了这个函数
```cpp
void func::sendDiscordWebhook(const std::string& webhookUrl, const std::string& content)
{
    CURL* curl;
    CURLcode res;

    curl_global_init(CURL_GLOBAL_ALL);

    curl = curl_easy_init();
    if (curl) {
        curl_easy_setopt(curl, CURLOPT_URL, webhookUrl.c_str());

        struct curl_slist* list = NULL;
        list = curl_slist_append(list, "Content-Type: application/json");

        curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);

        curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content.c_str());

        res = curl_easy_perform(curl);
        curl_slist_free_all(list);

        if (res != CURLE_OK)
            fprintf(stderr, "curl_easy_perform() failed: %s\n",
                curl_easy_strerror(res));

        curl_easy_cleanup(curl);
    }
    curl_global_cleanup();
}

我在这里调用这个函数

std::string message = "📷链接：" + url + "\n🔓密码：|" + zipPwd;

func::sendDiscordWebhook(config::Bot_url, message);

当我编译和运行这段代码时，一切都正常，没有出现任何错误，但当我检查Discord时，没有消息。

<details>
<summary>英文:</summary>

I want to send a message using Discord webhook in c++ libcurl. So I wrote this function

void func::sendDiscordWebhook(const std::string& webhookUrl, const std::string& content)
{
CURL* curl;
CURLcode res;

curl_global_init(CURL_GLOBAL_ALL);

curl = curl_easy_init();
if (curl) {
	curl_easy_setopt(curl, CURLOPT_URL, webhookUrl.c_str());

	struct curl_slist* list = NULL;
	list = curl_slist_append(list, "Content-Type: application/json");

	curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);

	curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content);

	res = curl_easy_perform(curl);
	curl_slist_free_all(list);     

	if (res != CURLE_OK)
		fprintf(stderr, "curl_easy_perform() failed: %s\n",
			curl_easy_strerror(res));

	curl_easy_cleanup(curl);
}
curl_global_cleanup();

}

I call this function here

std::string message = "🔗Link: "+url+"\n🔑Password: |"+ zipPwd;

func::sendDiscordWebhook(config::Bot_url, message);

When I compiled and ran this code all worked well, I didn't get any error, but when I check Discord there was no message.

</details>


# 答案1
**得分**: 0

[CURLOPT_POSTFIELDS](https://curl.se/libcurl/c/CURLOPT_POSTFIELDS.html) 需要一个 `char *`，也就是 `char[]` 或 C 风格的字符串。尝试用以下方式替换
`curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content);`：
`curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content.c_str());`。

此外，[Discord的Webhook文档](https://discord.com/developers/docs/resources/webhook#execute-webhook) 指出你需要将你的 postdata（代码中的 `content` 变量）格式化为 JSON，不能直接发送一个字符串。

<details>
<summary>英文:</summary>

[CURLOPT_POSTFIELDS](https://curl.se/libcurl/c/CURLOPT_POSTFIELDS.html) requires a `char *`, aka `char[]` or C-style string. Try replacing
`curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content);` with  
`curl_easy_setopt(curl, CURLOPT_POSTFIELDS, content.c_str());`.

Additionally, [Discord&#39;s webhook docs](https://discord.com/developers/docs/resources/webhook#execute-webhook) say that you need to format your postdata (the `content` variable in your code) as a JSON, and you can&#39;t just send a String.

</details>



# 答案2
**得分**: 0

以下是您要翻译的内容：

"通过Discord webhook发送的消息应完全符合JSON格式。您应该使用`\\n`代替`\n`，而且如果您想要正确的输出，您的消息应该具有如下格式：`std::string data`，而不是一行。"

```cpp
std::string title = "!新请求!";
std::string content = "\\n&#128100;用户: " + func::GetUser() + "\\n&#128279;链接: " + url + "\\n&#128273;密码: " + zipPwd;

//std::cout << url;

std::string data = R"({
    "content": null,
    "embeds": [{
        "title": ")" + title + R"(",
        "description": ")" + content + R"(",
        "color": 10181046
    }]
})";

std::string title = "!New request!";
    std::string content = "\\n👤User: " + func::GetUser() + "\\n🔗Link: " + url + "\\n🔑Password: " + zipPwd;

    //std::cout << url;

    std::string data = R"({
        "content": null,
        "embeds": [{
            "title": ")" + title + R"(",
            "description": ")" + content + R"(",
            "color": 10181046
        }]
    })";