我正在開發一個與 REST API 通信的庫。到目前為止，我為 PUT 呼叫撰寫的方法一直有效。
void Command::put(const std::string url, const std::string body)
{
CURLcode ret;
struct curl_slist *slist1;
slist1 = NULL;
// slist1 = curl_slist_append(slist1, "Content-Type: multipart/form-data;");
slist1 = curl_slist_append(slist1, "Content-Type: application/json;");
curl = curl_easy_init();
if(curl)
{
curl_easy_setopt(curl, CURLOPT_BUFFERSIZE, 102400L);
curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
curl_easy_setopt(curl, CURLOPT_NOPROGRESS, 1L);
curl_easy_setopt(curl, CURLOPT_POSTFIELDS, body.c_str());
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, (curl_off_t)12);
curl_easy_setopt(curl, CURLOPT_HTTPHEADER, slist1);
curl_easy_setopt(curl, CURLOPT_USERAGENT, "curl/7.79.1");
curl_easy_setopt(curl, CURLOPT_MAXREDIRS, 50L);
curl_easy_setopt(curl, CURLOPT_SSH_KNOWNHOSTS, "/Users/$USER/.ssh/known_hosts");
curl_easy_setopt(curl, CURLOPT_CUSTOMREQUEST, "PUT");
curl_easy_setopt(curl, CURLOPT_FTP_SKIP_PASV_IP, 1L);
curl_easy_setopt(curl, CURLOPT_TCP_KEEPALIVE, 1L);
ret = curl_easy_perform(curl);
curl_easy_cleanup(curl);
curl = NULL;
curl_slist_free_all(slist1);
slist1 = NULL;
}
curl_easy_cleanup(curl);
curl = nullptr;
curl_slist_free_all(slist1);
slist1 = NULL;
}
但是，它似乎不適用于陣列。下面是三個除錯 put 呼叫及其輸出。前兩個作業。第三個沒有。
// *** DEBUG ***
commandWrapper->put(
"http://192.168.1.7/api/x1CAh16Nr8NcKwgkUMVbyZX3YKFQrEaMAj5pFz0Z/lights/6/state", "{\"on\":true}");
commandWrapper->put(
"http://192.168.1.7/api/x1CAh16Nr8NcKwgkUMVbyZX3YKFQrEaMAj5pFz0Z/lights/6/state", "{\"bri\":123}");
commandWrapper->put(
"http://192.168.1.7/api/x1CAh16Nr8NcKwgkUMVbyZX3YKFQrEaMAj5pFz0Z/lights/6/state", "{\"xy\":[0.04,0.98]}");
[{"success":{"/lights/6/state/on":true}}]
[{"success":{"/lights/6/state/bri":123}}]
[{"error":{"type":2,"address":"/lights/6/state","description":"body contains invalid json"}}]2022-04-02T02:56:47.220Z - Living Room 1 - Status: 0
我對如何進行有點迷茫。我驗證了這個命令確實在命令列上作業。
uj5u.com熱心網友回復：
您需要更改此行：
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, (curl_off_t)12);
為此：
curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE_LARGE, (curl_off_t)body.size());
或者，簡單地完全省略CURLOPT_POSTFIELDSIZE_LARGE，因為body.c_str()在這種情況下是一個指向以空字符結尾的字串的指標。卷曲可以為您確定尺寸。
JSON{xy:[0.04,0.98]}是16個字符，比你聲稱的12個字符長，所以你在傳輸程序中截斷了JSON，這就是服務器認為它無效的原因。{"on":true}和都是{"bri":123}11 個字符（如果算上空終止符，則為 12 個），因此它們不會被截斷。
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