我正在撰寫一個 Qt 應用程式，并且我有一個應該注冊用戶的按鈕。我正在使用以下庫：
- https://github.com/nlohmann/json <- 用于 json 序列化/反序列化
- 庫庫爾
我的目標是能夠向以下端點發出發布請求：http://localhost:8000/api/register
它期待一個 POST 的 Content-Type: application/json, of utf-8, json body 像這樣：
{
"username": "test",
"password": "test"
}
發布請求通過，但回應給出錯誤。我試圖確定這是否是我的 libcurl 代碼的問題，或者是我的 python django 應用程式的錯誤。
這是 libcurl 代碼的詳細輸出：
E0125 08:52:00.886679 5816 API.h:43] {"password":"test2","username":"test"}
* STATE: INIT => CONNECT handle 0x2489d6b0bf8; line 1835 (connection #-5000)
* Added connection 0. The cache now contains 1 members
* family0 == v4, family1 == v6
* Trying 127.0.0.1:8000...
* STATE: CONNECT => CONNECTING handle 0x2489d6b0bf8; line 1896 (connection #0)
* Connected to 127.0.0.1 (127.0.0.1) port 8000 (#0)
* STATE: CONNECTING => PROTOCONNECT handle 0x2489d6b0bf8; line 2030 (connection #0)
* STATE: PROTOCONNECT => DO handle 0x2489d6b0bf8; line 2051 (connection #0)
> POST /api/register HTTP/1.1
Host: 127.0.0.1:8000
User-Agent: Jellybean-Launcher
Content-Type: application/json; charset: utf-8
Accept: application/json
Content-Length: 8
* STATE: DO => DID handle 0x2489d6b0bf8; line 2147 (connection #0)
* STATE: DID => PERFORMING handle 0x2489d6b0bf8; line 2266 (connection #0)
* Mark bundle as not supporting multiuse
* HTTP 1.1 or later with persistent connection
< HTTP/1.1 400 Bad Request
< Date: Tue, 25 Jan 2022 16:52:00 GMT
< Server: WSGIServer/0.2 CPython/3.9.7
< Content-Type: application/json
< Vary: Accept, Cookie
< Allow: POST, OPTIONS
< X-Frame-Options: DENY
< Content-Length: 109
< X-Content-Type-Options: nosniff
< Referrer-Policy: same-origin
<
{"detail":"JSON parse error - 'utf-8' codec can't decode byte 0xdd in position 0: invalid continuation byte"}* STATE: PERFORMING => DONE handle 0x2489d6b0bf8; line 2465 (connection #0)
* multi_done: status: 0 prem: 0 done: 0
* Connection #0 to host 127.0.0.1 left intact
* Expire cleared (transfer 0x2489d6b0bf8)
這是 libcurl 代碼本身：
void RegisterUser(std::string username, std::string password)
{
curl_global_init(CURL_GLOBAL_ALL);
nlohmann::json json_data;
json_data["username"] = "test";
json_data["password"] = "test2";
CURL* curl = curl_easy_init();
CURLcode res;
if (curl)
{
curl_easy_setopt(curl, CURLOPT_URL, GetRegistrationURL().c_str());
curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
struct curl_slist* chunk = NULL;
chunk = curl_slist_append(chunk, "Content-Type: application/json; charset: utf-8");
chunk = curl_slist_append(chunk, "Accept: application/json");
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, chunk);
curl_easy_setopt(curl, CURLOPT_POST, 1L);
/* Set the expected POST size. */
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, sizeof(json_data.dump().c_str()));
LOG(ERROR) << json_data.dump().c_str();
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json_data.dump().c_str());
curl_easy_setopt(curl, CURLOPT_USERAGENT, "Jellybean-Launcher");
res = curl_easy_perform(curl);
if (res == CURLE_OK)
{
//res = curl_easy_getinfo(curl, CURLINFO_CONTENT_TYPE, &ct);
}
curl_easy_cleanup(curl);
curl_slist_free_all(chunk);
}
curl_global_cleanup();
}
GetRegistrationURL() Returns an std::string which is scoped based on if you're in a development build or not. During development builds, it always passes localhost, and in release builds it passes the live web url.
Does anyone have any idea of what I may be doing wrong here?
uj5u.com熱心網友回復：
第一個錯誤在該行中curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, sizeof(json_data.dump().c_str()));。sizeof不做你認為它做的事情。
另一個錯誤是在curl_easy_setopt(curl, CURLOPT_POSTFIELDS, json_data.dump().c_str());存盤指向臨時資料內部的指標的行中json_data.dump()，它會導致未定義的行為，可能會發送垃圾。該錯誤'utf-8' codec can't decode byte 0xdd提示有關已洗掉記憶體區域的 Microsoft C 運行時標記 0xdddddddd。
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, (long)json_data.dump().size()));
curl_easy_setopt(curl, CURLOPT_COPYPOSTFIELDS, json_data.dump().c_str());
應該解決這個問題。可以省略設定CURLOPT_POSTFIELDSIZE，如果在 之前沒有設定大小CURLOPT_COPYPOSTFIELDS，則假定資料是一個以 null 結尾的字串 - 這是你的情況。
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