Real api trading interface C# call DEMO example

We all know that people have limits and are affected by emotions. In order to take the lead, programmatic trading was born, and the api interface is the bridge in the middle.

What is the api interface? The api interface is a necessary thing in a stock programmatic transaction. Like the wheels of a car, there is no programmatic transaction without it.

However, the use of the api interface is not available just by clicking on it, it is connected by loading and calling the programming language.

Today, I would like to share an example of the real api transaction interface called under C#.

using System.Runtime.InteropServices;
using System.Text;

namespace MetaTradeDemo;

/// <summary>
/// MetaTrade 接口
/// </summary>
public static class MetaTrade
{
	/* ---------------------------------------------------------------------------------
	 * 简单说明:
	 * 1.此文件为 .Net 与 MetaTrade 接口混合调用的接口文件
	 * 2.通常不需要修改此文件内容, 除非你非常了解 .Net 与 C++ 的调用规范
	 * 3.本接口在 .net6 下测试通过, .net6 为当前长期支持版本, 强烈建议您也使用这个版本
	 * ---------------------------------------------------------------------------------
	 */

	/// <summary>
	/// 初始化接口
	/// 调用此方法将会检验授权, 并返回授权的账户数量
	/// 建议在程序启动时, 调用此方法, 以便再进行后续操作
	/// </summary>
	/// <returns>已授权的账户数</returns>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern int Init();

	/// <summary>
	/// 反初始化接口
	/// 建议在程序退出出调用些方法
	/// </summary>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void Deinit();

	/// <summary>
	/// 登录账户
	/// </summary>
	/// <param name="ip">服务端 Ip 地址</param>
	/// <param name="port">端口号</param>
	/// <param name="version">版本号, 默认为空</param>
	/// <param name="yybId">营业部, 默认为零</param>
	/// <param name="account">账号, 同授权账号</param>
	/// <param name="tradeAccount">资金账号</param>
	/// <param name="jyPassword">交易密码</param>
	/// <param name="txPassword">通讯密码</param>
	/// <param name="errorInfo">错误信息，一般要分配256字节的空间，出错时为非空字符串</param>
	/// <returns>客户端 Id</returns>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern int Logon(string ip, short port, string version, short yybId, string account, string tradeAccount, string jyPassword, string txPassword, StringBuilder errorInfo);

	/// <summary>
	/// 注销账户
	/// </summary>
	/// <param name="clientId">客户端 Id</param>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void Logoff(int clientId);

	#region + QueryData / SendOrder / CancelOrder / GetQuote / Repay

	/// <summary>
	/// 查询各种交易数据
	/// </summary>
	/// <param name="clientId">客户端 Id</param>
	/// <param name="category">信息种类：0资金，1股份，2当日委托，3当日成交，4可撤单，5股东代码，6融资余额，7融券余额，8可融证券</param>
	/// <param name="result">返回信息，一般要分配1024*1024字节的空间，出错时为空字符串。</param>
	/// <param name="errorInfo">错误信息，一般要分配256字节的空间，出错时为非空字符串</param>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void QueryData(int clientId, int category, StringBuilder result, StringBuilder errorInfo);

	/// <summary>
	/// 委托下单
	/// </summary>
	/// <param name="clientId">客户端 Id</param>
	/// <param name="category">委托种类：0买入，1卖出，2融资买入，3融券卖出，4买券还券，5卖券还款，6现券还券</param>
	/// <param name="entrustType">委托类型：0上海限价委托；深圳限价委托，1深圳对方最优价格，2深圳本方最优价格，3深圳即时成交剩余撤销，4上海五档即成剩撤；深圳五档即成剩撤，5深圳全额成交或撤销，6上海五档即成转限价</param>
	/// <param name="gddm">股东代码</param>
	/// <param name="zqdm">证券代码</param>
	/// <param name="price">委托价格</param>
	/// <param name="quantity">委托数量</param>
	/// <param name="result">返回信息，一般要分配1024*1024字节的空间，出错时为空字符串。</param>
	/// <param name="errorInfo">错误信息，一般要分配256字节的空间，出错时为非空字符串</param>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void SendOrder(int clientId, int category, int entrustType, string gddm, string zqdm, float price, int quantity, StringBuilder result, StringBuilder errorInfo);

	/// <summary>
	/// 委托撤单
	/// </summary>
	/// <param name="clientId">客户端 Id</param>
	/// <param name="exchangeId">交易所 Id：A1上海，A0深圳（部分券商是2）</param>
	/// <param name="entrustId">委托编号</param>
	/// <param name="result">返回信息，一般要分配1024*1024字节的空间，出错时为空字符串。</param>
	/// <param name="errorInfo">错误信息，一般要分配256字节的空间，出错时为非空字符串</param>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void CancelOrder(int clientId, string exchangeId, string entrustId, StringBuilder result, StringBuilder errorInfo);

	/// <summary>
	/// 查询五档行情
	/// </summary>
	/// <param name="clientId">客户端 Id</param>
	/// <param name="zqdm">证券代码</param>
	/// <param name="result">返回信息，一般要分配1024*1024字节的空间，出错时为空字符串。</param>
	/// <param name="errorInfo">错误信息，一般要分配256字节的空间，出错时为非空字符串</param>
	[DllImport("MetaTrade.dll", CharSet = CharSet.Ansi)]
	public static extern void GetQuote(int clientId, string zqdm, StringBuilder result, StringBuilder errorInfo);

The above is a demo example of the MetaTrade interface under C#. Note that the .NET version is preferably .NET6.

Parameter deployment is simple. Strong stability after connection. For strategy, it is simply Wuhu taking off, no longer affected by emotions.