/// <summary>
/// TIM初始化
/// </summary>
/// <param name="sdk_app_id">官网申请的SDKAPPID</param>
/// <param name="json_sdk_config">IM SDK配置</param>
/// <returns>返回 TIM_SUCC 表示接口调用成功，其他值表示接口调用失败。每个返回值的定义请参考 TIMResult</returns>
public static TIMResult IMInit(int sdk_app_id, SdKConfig json_sdk_config = null)
{
return((TIMResult)TIMClientAPIDef.TIMInit((ulong)sdk_app_id, json_sdk_config != null? JsonConvert.SerializeObject(json_sdk_config):null));
}