1.json数据解析

样例如下;


{“cmd”: “start”, “nonce”: “11223344556”}

//create json root
cJSON *pJsonRoot = NULL;
unsigned char data[ ] = {"cmd": "start", "nonce": "11223344556"}；

  pJsonRoot= cJSON_Parse((const char*)data);
if(pJsonRoot == NULL)
{
    qDebug() << "c json parse msg string failed";
    return;
}
cJSON *pJsoncmd = cJSON_GetObjectItem(pJsonRoot, "cmd");
if(pJsoncmd == NULL)
{
    qDebug() << "cjson parse cmd failed";
    cJSON_Delete(pJsonRoot);
    return;
}
QString cmd= jsonNonce->valuestring;
    
cJSON *jsonNonce = cJSON_GetObjectItem(pJsonRoot, "nonce");
if(jsonNonce == NULL)
{
    qDebug() << "cjson parse nonce failed";
    cJSON_Delete(pJsonRoot);
    return;
}
QString nonce = jsonNonce->valuestring;

2.json数据打包

样例如下：


{“event”: “downloading”, “timestamp”: 1604289412, “taskid”: “1234”, “progress”: 0, “nonce”: “11223344500”}

string postParams, nonce;

unsigned char buffer[NETWORK_MAXBUF];
cJSON *root = cJSON_CreateObject();
cJSON_AddStringToObject(root, "event", "downloading");

QString timestamp = QString::number(QDateTime::currentMSecsSinceEpoch() / 1000);
cJSON_AddStringToObject(root, "timestamp", timestamp.toStdString().c_str());

cJSON_AddStringToObject(root, "taskid", "1234");
cJSON_AddNumberToObject(root, "progress", 0);

cJSON_AddStringToObject(root, "nonce", "12345678");

char* out = cJSON_PrintUnformatted(root);
postParams = (string)out;
int datamessagelen = generateMessage(buffer, 1, REPORT_REQUEST, getId(true), 0, postParams);
ssl_fun->sslWriteData(buffer, datamessagelen);
if(out!=NULL)
    free(out);
cJSON_Delete(root);